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Barracuda CloudGen Firewall

General Firewall Configuration

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To adjust resources used by your firewall service, you can change the sizing parameters in the General Firewall Configuration (CONFIGURATION > Configuration Tree > Box > Infrastructure Services) section of the Barracuda CloudGen Firewall. After changing general firewall configuration settings, perform a Firmware Restart (CONTROL > Box) for the changes to take effect. Default values vary depending on the model.

Firewall Sizing

Maximum Number of Connections
  • Max Session Slots – Set the maximum number of session slots allowed. The amount of memory consumed by the firewall is updated when this value is changed and displayed in the Firewall Memory [MB] field. (When set to the default value, the firewall service will consume about 150 MB RAM).

  • Max UDP [%] – (advanced) Defines the percentage of the Max Session Slots allowed to be UDP sessions.

    With eventing activated (parameter UDP Limit Exceeded set to yes), the event FW UDP Connection Limit Exceeded [4009] is generated when the limit is exceeded.

  • Max Echo [%] – (advanced) Defines the percentage of the Max Session Slots allowed to be ICMP sessions.

    With eventing activated (parameter Echo Limit Exceeded set to yes), the event FW ICMP-ECHO Connection Limit Exceeded [4027] is generated when the limit is exceeded.

  • Max Other [%] – (advanced) Defines the percentage of the Max Session Slots allowed to be an IP protocol type, except TCP, UDP, or ICMP.

    With eventing activated (parameter Other Limit Exceeded set to yes), the event FW OTHER-IP Session Limit Exceeded [4029] is generated when the limit is exceeded.

  • Firewall Memory [MB] – Displays the estimated memory requirement according to the current firewall configuration settings. If the value exceeds 200 MB, an additional bootloader parameter may be required. On i686-based CloudGen Firewalls with more than 768 MB RAM requiring additional vmalloc space to satisfy the increased memory demand of non-default firewall settings, we recommend increasing the vmalloc area in steps of 128 MB, starting at 384 MB. For more information, see How to Configure the Bootloader.

    Reboot the box after setting the parameter, and wait until the firewall service successfully starts after the system boot. Do not use vmalloc areas larger than 640 MB. The vmalloc area is shared among several kernel subsystems. Therefore, the exact size of the allocated vmalloc area that is required to load the firewall cannot be predetermined. Setting the vmalloc parameter to enable increased acpf memory operation is discouraged on systems with 768 MB of RAM or on "i386" architecture systems. Setting this parameter on those boxes could negatively affect the system performance and/or stability. The architecture of an installed CloudGen Firewall box can be determined with the following command: rpm -q kernel --qf %{ARCH}\\n.

Global Limits 1
  • Max DNS Entries – Defines the maximum number of DNS queries that may be triggered by the use of network objects containing hostnames. 75% of the queries are reserved for the forwarding firewall and 25% for the host firewall. Network objects used in both forwarding and host firewall rulesets will trigger two DNS queries and be counted twice.

    The firewall can only match on IP addresses. When the maximum amount of allowed DNS queries is exceeded, hostnames can no longer be resolved, causing access rules using these networks objects to never match.

  • Max Acceptors – (advanced) Maximum number of pending accepts for inbound rules. An acceptor is a dynamic implicit rule that is generated by plugins handling dynamic connection requests. The FTP protocol, for example, uses a data connection in addition to the control connection on TCP port 21 to perform the actual file transfer. By analyzing the FTP protocol, the firewall knows when such data connections occur and creates an acceptor to allow the corresponding data transfer session.
  • Max Pending Inbounds – Maximum number of pending TCP inbound requests. This parameter comes into effect only when the TCP accept policy is set to inbound for the access rule.
  • Max BARPs – (advanced) Defines the maximum number of bridging ARPs allowed. A bridging ARP entry (BARP) stores the information that specifies which bridge interface corresponds to a certain MAC address. Additionally, associated IP addresses are stored along with the BARP entry. Modifying this value may be useful for large bridging setups.
  • Max Plugins – (advanced) Maximum number of rules using plugins.
  • Dyn Service Names (RPC) – Maximum number of dynamic service name entries.
Global Limits 2
  • Inbound Mode Threshold [%] – Threshold of pending accepts, at which point the firewall switches to the inbound TCP accept policy to guard against SYN flooding attacks. 
  • SYN Cookie High Watermark [%] – (advanced) Percentage (of maximum pending inbounds) of pending inbound accepts to switch to SYN cookie usage for enhanced SYN flooding protection.
  • SYN Cookie Low Watermark [%] – (advanced) Percentage (of maximum pending inbounds) of pending inbound accepts to go back to ordinary SYN handling.
  • Max Dynamic Rules – Maximum number of dynamically activated rules.
  • Max Multiple Redirect IPs – Maximum number of IP addresses in rules with multiple redirect target IPs.  
Source-Based Session Limits
  • Max Local-On Session/Src – (advanced) Maximum number of sessions per source IP address. Cannot be set to more than Max Session Slots.

    With eventing activated (parameter Session/Src Limit Exceeded set to yes), the event FW Global Connection per Source Limit Exceeded [4024] is generated when the limit is exceeded.

  • Max Local-In UDP/Src – (advanced) Maximum number of UDP sessions per source IP address.

    With eventing activated (parameter UDP/Src Limit Exceeded set to yes), the event FW UDP Connection per Source Limit Exceeded [4008] is generated when the limit is exceeded.

  • Max Local-In Echo/Src – (advanced) Maximum number of ICMP Echo sessions per source IP. 

    With eventing activated (parameter Echo/Src Limit Exceeded set to yes), the event FW ICMP-ECHO Connection per Source Limit Exceeded [4026] is generated when the limit is exceeded.

  • Max Local-In Other/Src – (advanced) Maximum number of sessions for all other IP protocols (not TCP, UDP, ICMP) per source IP address. 

    With eventing activated (parameter Other/Src Limit Exceeded set to yes), the event FW OTHER-IP Connection per Source Limit Exceeded [4028] is generated when the limit is exceeded.

  • Max Pending Local Accepts/Src – (advanced) Maximum number of pending accepts per source IP address.

Firewall History

The firewall history stores connection information for troubleshooting purposes. You can configure how many and how long connections are stored in the General Firewall Configuration settings. Use the Advanced View to configure these settings.

  • Max. Access Entries – Determines the size of the visualization caches.
  • Max. Block Entries – Determines the maximum number of block entries.
  • Max. Drop Entries – Determines the maximum number of drop entries.
  • Max. Fail Entries – Determines the maximum number of fail entries.
  • Max. Scan Entries  – Determines the maximum number of scan entries.
  • Max. ARP Entries – Determines the maximum number of ARP entries.
  • DNS Resolve IPs – Setting this parameter to yes will resolve IPs to hostnames on the firewall history. This may cause excessive load on the DNS servers.

    If many DNS objects are used frequently, disable host resolution in the firewall history to avoid delays and errors in the DNS resolution.


Ruleset-Related Settings
  • Rule Matching Policy – Selects the way in which a rule lookup is performed.
    • Kernel space - linear lookup – Adequate for small rulesets.
    • Kernel space - tree lookup (fastest) – Preferred option for large rulesets with hundreds of rules.
      As a rule of thumb, for about 1000 session/s the Kernel space should be enabled for better firewall performance. Additionally, if many firewall objects (> 200) are used, the Kernel space - tree option is recommended.
  • Rule Change Behavior – This setting applies only to the forwarding firewall and not to the host firewall because the host firewall generally does not allow re-evaluation of a session upon a rule-change. The setting specifies whether an existing connection is terminated (Terminate-on-change or not (Keep-on-change) if the ruleset changes and the session is no longer allowed by the new ruleset.
  • No Rule Update Time Range – This option allows you to define a time range during which access rules may not be updated. Use international time format. For example, to disallow rule update from 14:00 through 22:00, insert 14-22.
  • On-demand network objects update – This option allows you to enable on-demand network objects. 
  • Network objects update interval – Update interval in minutes for on-demand network objects.
IPv6 Settings
  • Block Type 0 Routing Headers – This option allows you to block type 0 routing headers according to rfc5095.
Default TCP Policy
  • Syn Flood Protection – Defines the default behavior of the firewall with regard to the TCP three-way handshake.
    • Outbound – Passes on the SYN to the target address.

    • Inbound – The firewall completes the handshake and only then performs a handshake with the actual target. This helps to protect the target from SYN flood attacks. Disabling will cause an overhead in packet transmission, but may speed up interactive protocols like SSH. 
  • Nagle Algorithm – This parameter enables/disables the Nagle algorithm. This option is only available when using stream forwarding.
  • Perform TCP Sequence Check – This parameter enables/disables TCP sequence checks. You can select one of the following options:
    • RST-Packets-Only

    • All Packets
    • None
  • TCP Stream Reassembly – (advanced) Reassembles the TCP stream before scanning for vulnerabilities.
Raw TCP Mode Policy  
  • RAW TCP Idle Timeout [s] – Defines the idle timeout value in seconds for RAW TCP mode.
  • RAW TCP Timeout Policy – Defines the timeout policy that will be used for RAW TCP mode.
    • Use-global-timeouts – Sets the timeout value that has been configured in the previous sections.
    • Use-tcp-timeouts – Uses the timeout values from standard TCP set in the matching rule.
Default Anti-Spoofing Policy
  • ARP Reverse Route Check – Setting this parameter to Yes causes answers to ARP requests to be checked if source IP and interface match.

  • Reverse Interface Policy – The options of this parameter specify whether requests and replies must use the same (outgoing) interface (same-interface or not (interface-may-change).

    This parameter specifies the global policy. You may change the policy per rule, though it is NOT recommended to do so.


Port Scan Policy
  • Port Scan Threshold – When the number of blocked requests exceed the threshold, a port scan is detected and a port scan event is triggered. To not generate an event, see How to Configure Basic, Severity, and Notification Settings for Events.
  • Port Scan Detection Interval [s] – Detection interval in seconds to check for not allowed activity. In combination with the parameter Port Scan Threshold, it defines the condition when to report a port scan.
Performance-Related Policies
  • Session Creation CPU Limit [%– (advanced) Reserves a specific amount of CPU resources for the Barracuda OS to prevent the firewall from becoming unmanageable in case of a high amount of concurrent sessions being initiated. Barracuda Networks recommends to keep the Default value.

  • Validate TCP Checksum – (advanced) Enables an additional TCP packet consistency check. This will reduce performance.

  • Validate UDP Checksum – (advanced) Enables an additional UDP packet consistency check. This will reduce performance.
  • Parallel Shaping Tree Evaluation – (advanced) This option, if enabled, improves shaping tree evaluation.
    • Disabled – Disables this option.
    • Enabled – Improves shaping tree evaluation.
    • Enable-MultiQueue-Only (default) – Enables this feature only for shaping trees built on top of interfaces with multiple hardware-queues or with RPS enabled.
High Availability-Related Policies
  • Allow Active-Active Mode – (advanced) Active-Active firewall operation mode must be enabled in preparation for operation of multiple active firewalls on one box with a load balancer connected upstream.

  • Enable Session Sync – (advanced) All currently established sessions will be synced to the HA partner to improve failover performance.

  • Enable Authentication Sync – (advanced) This option allows you to enable authentication data synchronization between HA partners.

    Do not change unless otherwise stated from Barracuda Networks Technical Support.

    • Auto – Automatically detects if a direct synchronization is required, or if synchronization is done over an authentication synchronization zone.
    • Yes – Enables direct synchronization between HA partners.

    • No – Disables direct synchronization between HA partners.

  • Log Synced Sessions – (advanced) This setting determines logging of access cache sessions that have been synchronized between HA partners. Set to No to disable logging. Set to Auto to check if a trustzone synchronization is in place. If yes, the sync is done via trustzone, and direct synchronization gets disabled automatically. If no trustzone sync is configured, Auto will enable direct authentication sync.
  • Generically Forwarded  Networks – (advanced) Traffic between networks inserted into this field will be excluded from firewall monitoring and will be forwarded without source and destination differentiation, even if no forwarding firewall is installed.

    Local sessions are not reevaluated on rule change. This parameter only effects forwarding sessions. Workflow for enforcing changed local rules: manually terminate local sessions in the Firewall Live tab. Make use of this feature if you are operating your CloudGen Firewall only for routing and NOT for firewall purposes because generic network forwarding might cause severe security issues.

Operational IPS

This menu point in General Firewall Configuration is accessible only in Advanced Configuration Mode.

Intrusion Prevention System (IPS) Engine Settings

  • IPS Scan Mode – (advanced) Select the scanning mode for IPS. You must reboot for the changes to take effect.
    • Auto – (advanced) The firewall automatically chooses the best suited mode.
    • Fast-Scan – (advanced) With this option enabled, only the beginning of a session is scanned as most attacks occur within the first few packets regardless of the protocols used (TCP, UDP).
    • Full-Scan – (advanced) Scan all packets.

Intrusion Prevention System (IPS) Decoder Settings

  • HTML Parsing for IPS  Toggles HTML obfuscation detection. If this setting is changed, you must reboot for the changes to take effect.
  • HTML content-encoding decompression – Enables HTTP content-encoding decompression (gzip, deflate). A reboot is required.
  • HTML content-disposition decompression – Enables HTTP content-disposition decompression (zip). A reboot is required.
  • PDF decoder – Enables decoding of PDF documents. A reboot is required.
  • RPC decoder – Enables an RPC decoder. This is used for DCERPC and SMB connections. A reboot is required.

Operational VPN

  • Enable Assembler Ciphers – (advanced) Using the assembler implementation for AES/SHA/MD5 increases VPN performance significantly.
  • Enable Intel AVX Extensions – Enables or disables the usage of Intel’s AVX extension (also valid on AMD processors).

    Reboot for this setting to take effect.

  • Globally clear DF Bit – (advanced) Clears the DF bit for each ipv4 packet routed through a VPN tunnel. For more information on MTU, see Advanced Routing.

Application Detection

Resource Failure Policy
  • Out of Memory Policy – An Out of Memory condition may disable protocol and application detection. As a consequence, all deeper analysis will be disabled as well. 
    • Fail-Open – Select to continue forwarding. 
    • Fail-Close – Select to terminate the affected sessions.
URL Categorization
Always reboot the firewall after changing one of the following values!
  • Max. Cache Entries – The maximum number of entries in the kernel cache. 0 is auto selection depending on RAM size.
  • Categorization Timeout [s] – Set the maximum timeout to wait for categorization response.
  • Cache Entry Expiration [s] – After the configured time, the cached entries category will be updated.
  • Cache Entry Expiration (no cat.) [s] – After the specified time in seconds, the cached entries' category, with category 'not categorized' will be updated.
  • Cache Entry Expiration (err cat.) [s] – After the specified time in seconds, the cached entries' category, with category 'assigning error' will be updated.
  • Log Verbosity – (advanced) The log level of the URL Filter engine.

    Increasing this value may produce huge URL Filter log files. Increase only in case of debugging.

Application and Port Protocol Detection
Application Detection Destination Tracking
  • Enable Destination Tracking – Set to no unless specifically instructed otherwise by Barracuda Networks Technical Support.
Supervisory Control and Data Acquisition (SCADA)
  • SCADA Protocol Detection – Enable to detect SCADA protocols.

    • Disabled – Detection is disabled.

    • Enable without Parsing Log – Detected SCADA protocols are included in the Firewall Activity log.

    • Enable with Parsing Log – Enabled with detailed logs (box/SCADA/parsing).

  • SCADA Dump Size [MB] – (advanced) A value of 0 means disabled. Enable to write a dump file for further analysis if SCADA protocol detection is enabled without parsing log support.

Audit and Reporting

Statistics Policy
  • Generate Dashboard Information – Enable/disable the firewall dashboard.
  • Generate Monitor Information – Enable the firewall monitor.
  • Maximum Storage Size [MB] – Specify the storage size in megabytes to be used to monitor information data. A value of 0 enables automatic assignment based on the device. This parameter relates to the virtual disk size of the APPID_stat database and is set to 'auto' per default. 'Auto' means:
    • /phion0 partition size-dependent calculation.
    • Below 20 GB: 10 MB for all database files.
    • Between 20 GB and 100 GB: 100 MB for all database files.
    • Greater than 100 GB: 200 MB for all database files.
  • Statistics for Host Firewall – This option enables statistics for connections passing through the host firewall.
  • Generate Protocol Statistics – If enabled, protocol and P2P-specific statistics are created and listed within the statistics viewer under .../BOX/proto-stat/...
  • Use username if available – If set to yes, usernames are used for statistics, if available. Otherwise, the source IP address is used.
Eventing Policy
  • Generate Events – Enable/Disable event generation.
  • Event Data – (advanced) Use this section to selectively enable or disable event generation.
    • Click Edit and define the events data should be generated for.
Log Policy
  • Application Control Logging – Select the global policy for Application Control logging.

    This setting will be replaced by the rule log policy if specified.

  • Activity Log Mode – Configure whether the Firewall Activity logs use key-value pairs or only log the values. For more information, see Available Log Files and Structure

  • Activity Log Data – Configure whether the Firewall Activity logs uses full text or encoded information according to the list below. The encoded format is typically used to reduce the size of the log files.

    4000Unknown Block Reason
    4001Forwarding is disabled
    4002Block by Rule
    4003Block no Rule Match
    4004Block by Rule Source Mismatch
    4005Block by Rule Destination Mismatch
    4006Block by Rule Service Mismatch
    4007Block by Rule Time Mismatch
    4008Block by Rule Interface Mismatch
    4009Block Local Loop
    4010Block by Rule ACL
    4011Block Rule Limit Exceeded
    4012Block Rule Source Limit Exceeded
    4013Block Pending Session Limit Exceeded
    4014Block Size Limit Exceeded
    4015Block by Dynamic Rule
    4016Block No Address Translation possible
    4017Block Broadcast
    4018Block Multicast
    4019Block Source Session Limit Exceeded
    4020Block UDP Session Limit Exceeded
    4021Block Source UDP Session Limit Exceeded
    4022Block Echo Session Limit Exceeded
    4023Block Source Echo Session Limit Exceeded
    4024Block Other Session Limit Exceeded
    4025Block Source Other Session Limit Exceeded
    4026Block Total Session Limit Exceeded
    4027Block no Route to Destination
    4028Block Invalid Protocol for Rule Action
    4029Block Protected IP Count Exceeded Licensed Limit
    4030Block Device not available
    4031Block by Rule User Mismatch
    4032Block Bridged Destination MAC Unknown
    4033Block by Rule MAC Mismatch
    4034Send Authentication Required
    4035Block Invalid Local Redirection to Non Local Address
    4036Block Invalid Redirection to Local Address
    4037Block Slot Creation Failed
    4038Block by Rule Quarantine Class Mismatch
    4039Local IPv6 traffic is disabled
    4040WANOPT Protocol Negotiation Mismatch
    4041Block by Rule App mismatch
    4042URL Categorization not available and policy set to fail
    4043URL Domain Explicitly not Allowed by URL Categorization
    4044URL Category not Allowed by Policy
    4045URL Category Blocked by Policy
    4046Block due to ATP Quarantine
    4047Block Unauthorized ATP File Download Access
    4048URL Categorization not available and policy set to fail
    4049URL Category must be acknowledged by user
    4050Custom URL domain must be acknowledged by user
    4051URL Category must be acknowledged by supervisor
    4052Detected Content not allowed by policy
    4053Detected Browser Agent not allowed by policy
    4054Untrusted self-signed certificate
    4055Certificate not trusted
    4056Certificate Revoked
    4057Expired or not yet valid certificate
    4058Certificate content invalid
    4059Certificate revocation check failure
    7000Unknown Block Reason
    7001Forwarding is disabled
    7002Block by Rule
    7003Block no Rule Match
    7004Block by Rule Source Mismatch
    7005Block by Rule Destination Mismatch
    7006Block by Rule Service Mismatch
    7007Block by Rule Time Mismatch
    7008Block by Rule Interface Mismatch
    7009Block Local Loop
    7010Block by Rule ACL
    7011Block Rule Limit Exceeded
    7012Block Rule Source Limit Exceeded
    7013Block Pending Session Limit Exceeded
    7014Block Size Limit Exceeded
    7015Block by Dynamic Rule
    7016Block No Address Translation possible
    7017Block Broadcast
    7018Block Multicast
    7019Block Source Session Limit Exceeded
    7020Block UDP Session Limit Exceeded
    7021Block Source UDP Session Limit Exceeded
    7022Block Echo Session Limit Exceeded
    7023Block Source Echo Session Limit Exceeded
    7024Block Other Session Limit Exceeded
    7025Block Source Other Session Limit Exceeded
    7026Block Total Session Limit Exceeded
    7027Block no Route to Destination
    7028Block Invalid Protocol for Rule Action
    7029Block Protected IP Count Exceeded Licensed Limit
    7030Block Device not available
    7031Block by Rule User Mismatch
    7032Block Bridged Destination MAC Unknown
    7033Block by Rule MAC Mismatch
    7034Send Authentication Required
    7035Block Invalid Local Redirection to Non Local Address
    7036Block Invalid Redirection to Local Address
    7037Block Slot Creation Failed
    7038Block by Rule Quarantine Class Mismatch
    7039Local IPv6 traffic is disabled
    7040WANOPT Protocol Negotiation Mismatch
    7041Block by Rule App mismatch
    7042URL Categorization not available and policy set to fail
    7043URL Domain Explicitly not Allowed by URL Categorization
    7044URL Category not Allowed by Policy
    7045URL Category Blocked by Policy
    7046Block due to ATP Quarantine
    7047Block Unauthorized ATP File Download Access
    7048URL Categorization not available and policy set to fail
    7049URL Category must be acknowledged by user
    7050Custom URL domain must be acknowledged by user
    7051URL Category must be acknowledged by supervisor
    7052Detected Content not allowed by policy
    7053Detected Browser Agent not allowed by policy
    7054Untrusted self-signed certificate
    7055Certificate not trusted
    7056Certificate Revoked
    7057Expired or not yet valid certificate
    7058Certificate content invalid
    7059Certificate revocation check failure
    2000Session Idle Timeout
    2001Balanced Session Idle Timeout
    2002Last ACK Timeout
    2003Retransmission Timeout
    2004Halfside Close Timeout
    2005Unreachable Timeout
    2006Connection Closed
    2007Connection Reset by Source
    2008Connection Reset by Destination
    2009Connection Reset by Administrator
    2010Allow time interval expired
    2011Connection no Longer Allowed by Rule
    2012Dynamic Rule Expired
    2013Terminated due to content
    2014Forward Destination is a Local Address
    2015Unsyncable Session and Passive Sync Mode
    2016Network Device no Longer Available
    2017Dynamic Service not Allowed by Rule
    2018Session Duration Timeout
    2019Application Control
    2020Unallowed Protocol Detected
    2021IPS Policy Requested Termination
    2022WANOPT Policy Negotiation Failed
    2023None of the Allowed Protocols Detected
    2024Session diverted to dynamic mesh VPN tunnel
    2025Internal SSL Error
    2026Self Signed Cert Found
    2027No Issuer Found
    2028Certificate Revoked
    2029Certificate Validation Failed
    2030No Local Socket Present
    2031Out of Memory Fail Close"
    6000Unknown Scan Reason
    6001Terminate due to Pattern Detection
    6002Pattern Detection
    6003Application Control
    6004Drop due to Application Control
    6005Shape due to Application Control
    6006Unallowed Port Protocol Detected
    6007Reset due to Unallowed Port Protocol Detection
    6008Drop due to Unallowed Port Protocol Detection
    6009IPS Log
    6010IPS Warning
    6011IPS Alert
    6012IPS Drop Log
    6013IPS Drop Warning
    6014IPS Drop Alert
    6015Web Access
    6016Application/Protocol Detection
    6017Application/Protocol Warning
    6018Application/Protocol Alert
    6019Application/Protocol Denied
    6020Application/Protocol Denied with Warning
    6021Application/Protocol Denied with Alert
    6022URL Categorization
    6023URL Categorization Warning
    6024URL Categorization Alert
    6025URL Category Denied
    6026URL Category Denied with Warning
    6027URL Category Denied with Alert
    6028Virus Blocked
    6029Malicious File Blocked by Advanced Threat Protection
    6030Virus Scan not possible - Blocked
    6031Virus Scan not possible - Passed
    6032Virus Scan Error - Blocked
    6033Virus Scan Error - Passed
    6034Malicious Content Detected in Delivered File
    6035DNS Request for a Hostname with bad Reputation
    6036Client access to a DNS Sinkhole Address
    6037Client access to a Hostname with bad Reputation"
    1000Network Unreachable
    1001Host Unreachable
    1002Protocol Unreachable
    1003Port Unreachable
    1004Fragmentation Needed
    1005Source Route Failed
    1006Network Unknown
    1007Host Unknown
    1008Source Host Isolated
    1009Network Access Denied
    1010Host Access Denied
    1011Network Unreachable for TOS
    1012Host Unreachable for TOS
    1013Denied by Filter
    1014Host Precedence Violation
    1015Host Precedence Cutoff
    1016Connect Timeout
    1017Accept Timeout
    1018No Route to Host
    1019Unknown Network Error
    1020Routing Triangle
    1021TTL Expired
    1022Defragmentation Timeout
    1023No Route To Destination
    1024Communication Prohibited
    1025Unknown Code 2
    1026Address Unreachable
    1027Port Unreachable
    1028WANOPT Protocol Negotiation Mismatch
    1029WANOPT Out of descriptors
    1030WANOPT Partner protocol missing
    1031WANOPT No VPN
    1032Internal SSL Error
    1033Untrusted self-signed certificate
    1034Certificate not trusted
    1035Certificate Revoked
    1036Expired or not yet valid certificate
    1037Certificate content invalid
    1038Certificate revocation check failure
    1039Flex connection timeout
    1040Flex connection error
    1041Out of Memory Fail Close"
    3000Reverse Routing MAC Mismatch
    3001Reverse Routing Interface Mismatch
    3002Source is Multicast
    3003Source is Broadcast
    3004Source is an Invalid IP Class
    3005Source is Loopback
    3006Source is Local Address
    3007IP Header is Incomplete
    3008IP Header Version is Invalid
    3009IP Header Checksum is Invalid
    3010IP Header has Invalid IP Options
    3011IP Header Contains Source Routing
    3012IP Packet is Incomplete
    3013TCP Header is Incomplete
    3014TCP Header Checksum is Invalid
    3015TCP Header has an Invalid Cookie
    3016TCP Header has an Invalid SEQ Number
    3017TCP Header has an Invalid ACK Number
    3018TCP Header has Invalid TCP Options
    3019TCP Header has Invalid TCP FLAGS
    3020TCP Packet Belongs to no Active Session
    3021UDP Header is Incomplete
    3022UDP Header Checksum is Invalid
    3023ICMP Header is Incomplete
    3024ICMP Header Checksum is Invalid
    3025ICMP Type is Invalid
    3026ICMP Reply Without a Request
    3027No socket for packet
    3028Forwarding not Active
    3029No Device for source IP address
    3030ARP request device mismatch
    3031ARP reply duplicate and MAC differs
    3032Size Limit Exceeded
    3033Rate Limit Exceeded
    3034TTL Expired
    3035Unknown ARP Operation
    3036ICMP Packet Belongs to no Active Session
    3037ICMP Packet is Ignored
    3038ICMP Packet is Ignored by Rule Settings
    3039High Level Protocol Header is Incomplete
    3040High Level Protocol Header is Invalid
    3041High Level Protocol Version is Invalid
    3042High Level Protocol Packet is Incomplete
    3043High Level Protocol Packet is Invalid
    3044Source MAC Mismatch
    3045Destination MAC Mismatch
    3046Bridge ACL violation
    3047ARP Burst Detected
    3048Static bridge ARP mismatch
    3049Change of locked ARP entry
    3050Possible MAC Spoofing
    3051No Next hop Allowed on Bridge Segment
    3052Decompression failed
    3053Session Creation Load Exceeded
    3054Failed to update/create QARP entry
    3055Failed to retrieve routing information for quarantine setup
    3056Cannot send packets between different quarantine groups
    3057QARP device entry does not match device to be used
    3058Drop guessed TCP RST
    3059Invalid SYN for Established TCP Session
    3060Received Packet Exceeds NIC MTU (Invalid TCP-Segmentation-Offload ?)
    3061TCP Header ACK Sequence Number out of Window Size
    3062Unsupported IPV6 header
    3063No Ruleset loaded
    3064Source Barp Unknown
    3065Source and destination Barp on the same device
    3066Drop Otherhost
    3067Firewall not active
    3068Payload linearization failed
    3069Reevaluation failed
    3070Unknown fragment
    3071Bridge Loop Detected
    3072Interface is set to discard by RSTP"
    5000Unknown Deny Reason
    5001Deny by Rule
    5002Deny by Rule Source Mismatch
    5003Deny by Rule Destination Mismatch
    5004Deny by Rule Service Mismatch
    5005Deny by Rule Time Mismatch
    5006Deny Local Loop
    5007Deny by Rule ACL
    5008Deny by Dynamic Rule
    5009Deny No Address Translation possible
  • Activity Log Information – Click Set/Edit to define what type of information is included in the firewall activity log. Click Clear to reset to factory default values.
  • Log Level – Decides whether log messages are accumulated to avoid too large log files.
  • Cumulative Interval [s] – (advanced) Interval in seconds for which cumulative logging is activated for either matching or similar log entries.
  • Cumulative Maximum – (advanced) Maximum of similar log entries to start cumulative logging.
  • Generate Audit Log – Enable the generation of structured firewall audit data that can be stored locally and/or forwarded. If enabled, the Audit Log tab of the firewall UI will get populated with data).
  • Audit Log Data – (advanced) Click Set/Edit to selectively enable or disable audit log generation. Click Clear to reset to factory default values.
  • Log ICMP Packets – Select the logging policy for ICMP packets.
    • Log-All – Log all ICMP packets except type ECHO.
    • Log-Unexpected – Log all ICMP packets except ECHO and UNREACHABLE.
    • Log-None – Disable ICMP logging.
  • Allow Threat Log Processing – Allow other processes to access threat log information for further processing.
IPFIX Export
  • Enable IPFIX Export – Set to yes to enable sending of IP flow information using the IP flow information export (IPFIX) protocol.
  • Enable Intermediate Flow Reports – Enable sending of intermediate reports with delta counters. (Use the Intermediate Reporting Interval [min] option to determine how often intermediate reports are sent)
  • Intermediate Reporting Interval [min] – Interval in minutes between two intermediate IPFIX flow reports for each active flow.
  • Template – If set to Extended, includes additional information, such as delta counters, to the IPFIX export. If your collector does not support reverse flows, select Uniflow templates. These templates will duplicate the traffic against the collector.

    Starting with firmware version 8.0.5 / 8.2.0, former IPFIX templates were updated to newer versions. It is recommended to change the former settings by selecting the related new names, in example, switch from *DEPRECATED* Uniflow Default to Uniflow Default in the respective menu list in the UI.
  • Custom Templates – If Custom is selected for Template, you can configure your own set of information elements in the window Custom Template after you clicked Edit... .
  • Collectors – Click + to add external IPFIX collectors.
  • Report Blocked or Failed Sessions – If set to yes, this option enables sending of flow records for packets that were not forwarded by the firewall, e.g., because they were blocked or the respective session could not be established.
Connection Tracing
  • Settings – Click Set/Edit to configure connection tracing settings.

Out of Session Packets

This menu point in General Firewall Configuration is accessible only in Advanced Configuration Mode.

Out of Session [OOS] Packet Policy
  • Interfaces to Send TCP RST – (advanced) The firewall sends TCP RST packets to these network interfaces if it detects packets not belonging to an active session. This is useful to avoid timeouts on certain servers.
  • IPV4 Networks to Send TCP RST – (advanced) The firewall sends TCP RST packets to these IPv4 networks if it detects packets not belonging to an active session.
  • IPV6 Networks to Send TCP RST – (advanced) The firewall sends TCP RST packets to these IPv6 networks if it detects packets not belonging to an active session.

Global Safe Search

Search Engine Log

  • Enable Search Engine Log – (advanced) Set to yes to enable logging of search strings. The log file will be created as soon as the firewall detects a query. You can inspect the log file searchString in your firewall on LOGS > Log Viewer > Assigned Services > NGFW.

Safe Search Settings

You can protect users behind a Barracuda CloudGen Firewall from undesired content in search results. To achieve this, enable the following options:

  • Enable Youtube Safe Search – Set this option to yes to enable YouTube safe search.
  • Enable Bing Safe Search – Set this option to yes to enable Bing safe search.
  • Enable Google Safe Search – Set this option to yes to enable Google safe search.
  • Enable Yahoo Safe Search – Set this option to yes to enable Yahoo safe search.

Advanced Log Settings

This menu point in General Firewall Configuration is accessible only in Advanced Configuration Mode.

  • Security Policy Facility Loglevels – (advanced) Specify the general log level for services running on the firewall.
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