General Firewall Configuration

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.

This setting can be overridden with the Resource Protection settings in the advanced section of a forwarding firewall rule. Private IPv4 addresses are exempted completely.

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

This setting can be overridden with the Resource Protection settings in the advanced section of a forwarding firewall rule. Private IPv4 addresses are exempted completely.

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

This setting can be overridden with the Resource Protection settings in the advanced section of a forwarding firewall rule. Private IPv4 addresses are exempted completely.

• 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.

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.

• 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

• Max. Dynamic Rules – Maximum number of dynamically activated rules. The default preset value is 128.

• Max. Multiple Redirect IPs – Maximum number of IP addresses in rules with multiple redirect target IPs. The default preset value is 128.

Global Inbound Mode Limits

• Inbound Mode Threshold [%] – This is the percentage value of the maximum number of sessions in the pending accept state. If the threshold value is reached, the firewall will switch to a general inbound TCP accept policy for SYN flooding protection. The default preset value is 20.

• SYN Cookie High Watermark [%] – This is the percentage (of the maximum number of pending inbounds) of pending inbound accepts to switch to TCP SYN cookie usage for enhanced SYN flooding protection. The default preset value is 20.

• SYN Cookie Low Watermark [%] – This is the percentage (of the maximum number of pending inbounds) of pending inbound accepts to go back to ordinary SYN handling. The default preset value is 15.

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.

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

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

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

• 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.

Operational

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).

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.

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.

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).

• 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

• 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.

Application and Port Protocol Detection

• Enable Port Detection – Set to yes to use deep packet inspection to enforce the used protocol on a port. For more information, see How to Configure Port Protocol Protection

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 20GB: 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.

• 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.

  Block Reasons

  
  

  4000	Unknown Block Reason
  4001	Forwarding is disabled
  4002	Block by Rule
  4003	Block no Rule Match
  4004	Block by Rule Source Mismatch
  4005	Block by Rule Destination Mismatch
  4006	Block by Rule Service Mismatch
  4007	Block by Rule Time Mismatch
  4008	Block by Rule Interface Mismatch
  4009	Block Local Loop
  4010	Block by Rule ACL
  4011	Block Rule Limit Exceeded
  4012	Block Rule Source Limit Exceeded
  4013	Block Pending Session Limit Exceeded
  4014	Block Size Limit Exceeded
  4015	Block by Dynamic Rule
  4016	Block No Address Translation possible
  4017	Block Broadcast
  4018	Block Multicast
  4019	Block Source Session Limit Exceeded
  4020	Block UDP Session Limit Exceeded
  4021	Block Source UDP Session Limit Exceeded
  4022	Block Echo Session Limit Exceeded
  4023	Block Source Echo Session Limit Exceeded
  4024	Block Other Session Limit Exceeded
  4025	Block Source Other Session Limit Exceeded
  4026	Block Total Session Limit Exceeded
  4027	Block no Route to Destination
  4028	Block Invalid Protocol for Rule Action
  4029	Block Protected IP Count Exceeded Licensed Limit
  4030	Block Device not available
  4031	Block by Rule User Mismatch
  4032	Block Bridged Destination MAC Unknown
  4033	Block by Rule MAC Mismatch
  4034	Send Authentication Required
  4035	Block Invalid Local Redirection to Non Local Address
  4036	Block Invalid Redirection to Local Address
  4037	Block Slot Creation Failed
  4038	Block by Rule Quarantine Class Mismatch
  4039	Local IPv6 traffic is disabled
  4040	WANOPT Protocol Negotiation Mismatch
  4041	Block by Rule App mismatch
  4042	URL Categorization not available and policy set to fail
  4043	URL Domain Explicitly not Allowed by URL Categorization
  4044	URL Category not Allowed by Policy
  4045	URL Category Blocked by Policy
  4046	Block due to ATP Quarantine
  4047	Block Unauthorized ATP File Download Access
  4048	URL Categorization not available and policy set to fail
  4049	URL Category must be acknowledged by user
  4050	Custom URL domain must be acknowledged by user
  4051	URL Category must be acknowledged by supervisor
  4052	Detected Content not allowed by policy
  4053	Detected Browser Agent not allowed by policy
  4054	Untrusted self-signed certificate
  4055	Certificate not trusted
  4056	Certificate Revoked
  4057	Expired or not yet valid certificate
  4058	Certificate content invalid
  4059	Certificate revocation check failure

  
  

  Blocked Applications

  
  

  7000	Unknown Block Reason
  7001	Forwarding is disabled
  7002	Block by Rule
  7003	Block no Rule Match
  7004	Block by Rule Source Mismatch
  7005	Block by Rule Destination Mismatch
  7006	Block by Rule Service Mismatch
  7007	Block by Rule Time Mismatch
  7008	Block by Rule Interface Mismatch
  7009	Block Local Loop
  7010	Block by Rule ACL
  7011	Block Rule Limit Exceeded
  7012	Block Rule Source Limit Exceeded
  7013	Block Pending Session Limit Exceeded
  7014	Block Size Limit Exceeded
  7015	Block by Dynamic Rule
  7016	Block No Address Translation possible
  7017	Block Broadcast
  7018	Block Multicast
  7019	Block Source Session Limit Exceeded
  7020	Block UDP Session Limit Exceeded
  7021	Block Source UDP Session Limit Exceeded
  7022	Block Echo Session Limit Exceeded
  7023	Block Source Echo Session Limit Exceeded
  7024	Block Other Session Limit Exceeded
  7025	Block Source Other Session Limit Exceeded
  7026	Block Total Session Limit Exceeded
  7027	Block no Route to Destination
  7028	Block Invalid Protocol for Rule Action
  7029	Block Protected IP Count Exceeded Licensed Limit
  7030	Block Device not available
  7031	Block by Rule User Mismatch
  7032	Block Bridged Destination MAC Unknown
  7033	Block by Rule MAC Mismatch
  7034	Send Authentication Required
  7035	Block Invalid Local Redirection to Non Local Address
  7036	Block Invalid Redirection to Local Address
  7037	Block Slot Creation Failed
  7038	Block by Rule Quarantine Class Mismatch
  7039	Local IPv6 traffic is disabled
  7040	WANOPT Protocol Negotiation Mismatch
  7041	Block by Rule App mismatch
  7042	URL Categorization not available and policy set to fail
  7043	URL Domain Explicitly not Allowed by URL Categorization
  7044	URL Category not Allowed by Policy
  7045	URL Category Blocked by Policy
  7046	Block due to ATP Quarantine
  7047	Block Unauthorized ATP File Download Access
  7048	URL Categorization not available and policy set to fail
  7049	URL Category must be acknowledged by user
  7050	Custom URL domain must be acknowledged by user
  7051	URL Category must be acknowledged by supervisor
  7052	Detected Content not allowed by policy
  7053	Detected Browser Agent not allowed by policy
  7054	Untrusted self-signed certificate
  7055	Certificate not trusted
  7056	Certificate Revoked
  7057	Expired or not yet valid certificate
  7058	Certificate content invalid
  7059	Certificate revocation check failure

  
  

  Termination Reasons

  
  

  2000	Session Idle Timeout
  2001	Balanced Session Idle Timeout
  2002	Last ACK Timeout
  2003	Retransmission Timeout
  2004	Halfside Close Timeout
  2005	Unreachable Timeout
  2006	Connection Closed
  2007	Connection Reset by Source
  2008	Connection Reset by Destination
  2009	Connection Reset by Administrator
  2010	Allow time interval expired
  2011	Connection no Longer Allowed by Rule
  2012	Dynamic Rule Expired
  2013	Terminated due to content
  2014	Forward Destination is a Local Address
  2015	Unsyncable Session and Passive Sync Mode
  2016	Network Device no Longer Available
  2017	Dynamic Service not Allowed by Rule
  2018	Session Duration Timeout
  2019	Application Control
  2020	Unallowed Protocol Detected
  2021	IPS Policy Requested Termination
  2022	WANOPT Policy Negotiation Failed
  2023	None of the Allowed Protocols Detected
  2024	Session diverted to dynamic mesh VPN tunnel
  2025	Internal SSL Error
  2026	Self Signed Cert Found
  2027	No Issuer Found
  2028	Certificate Revoked
  2029	Certificate Validation Failed
  2030	No Local Socket Present
  2031	Out of Memory Fail Close"

  
  

  Scan Reasons

  
  

  6000	Unknown Scan Reason
  6001	Terminate due to Pattern Detection
  6002	Pattern Detection
  6003	Application Control
  6004	Drop due to Application Control
  6005	Shape due to Application Control
  6006	Unallowed Port Protocol Detected
  6007	Reset due to Unallowed Port Protocol Detection
  6008	Drop due to Unallowed Port Protocol Detection
  6009	IPS Log
  6010	IPS Warning
  6011	IPS Alert
  6012	IPS Drop Log
  6013	IPS Drop Warning
  6014	IPS Drop Alert
  6015	Web Access
  6016	Application/Protocol Detection
  6017	Application/Protocol Warning
  6018	Application/Protocol Alert
  6019	Application/Protocol Denied
  6020	Application/Protocol Denied with Warning
  6021	Application/Protocol Denied with Alert
  6022	URL Categorization
  6023	URL Categorization Warning
  6024	URL Categorization Alert
  6025	URL Category Denied
  6026	URL Category Denied with Warning
  6027	URL Category Denied with Alert
  6028	Virus Blocked
  6029	Malicious File Blocked by Advanced Threat Protection
  6030	Virus Scan not possible - Blocked
  6031	Virus Scan not possible - Passed
  6032	Virus Scan Error - Blocked
  6033	Virus Scan Error - Passed
  6034	Malicious Content Detected in Delivered File
  6035	DNS Request for a Hostname with bad Reputation
  6036	Client access to a DNS Sinkhole Address
  6037	Client access to a Hostname with bad Reputation"

  
  

  Fail Reasons

  
  

  1000	Network Unreachable
  1001	Host Unreachable
  1002	Protocol Unreachable
  1003	Port Unreachable
  1004	Fragmentation Needed
  1005	Source Route Failed
  1006	Network Unknown
  1007	Host Unknown
  1008	Source Host Isolated
  1009	Network Access Denied
  1010	Host Access Denied
  1011	Network Unreachable for TOS
  1012	Host Unreachable for TOS
  1013	Denied by Filter
  1014	Host Precedence Violation
  1015	Host Precedence Cutoff
  1016	Connect Timeout
  1017	Accept Timeout
  1018	No Route to Host
  1019	Unknown Network Error
  1020	Routing Triangle
  1021	TTL Expired
  1022	Defragmentation Timeout
  1023	No Route To Destination
  1024	Communication Prohibited
  1025	Unknown Code 2
  1026	Address Unreachable
  1027	Port Unreachable
  1028	WANOPT Protocol Negotiation Mismatch
  1029	WANOPT Out of descriptors
  1030	WANOPT Partner protocol missing
  1031	WANOPT No VPN
  1032	Internal SSL Error
  1033	Untrusted self-signed certificate
  1034	Certificate not trusted
  1035	Certificate Revoked
  1036	Expired or not yet valid certificate
  1037	Certificate content invalid
  1038	Certificate revocation check failure
  1039	Flex connection timeout
  1040	Flex connection error
  1041	Out of Memory Fail Close"

  
  

  Drop Reasons

  
  

  3000	Reverse Routing MAC Mismatch
  3001	Reverse Routing Interface Mismatch
  3002	Source is Multicast
  3003	Source is Broadcast
  3004	Source is an Invalid IP Class
  3005	Source is Loopback
  3006	Source is Local Address
  3007	IP Header is Incomplete
  3008	IP Header Version is Invalid
  3009	IP Header Checksum is Invalid
  3010	IP Header has Invalid IP Options
  3011	IP Header Contains Source Routing
  3012	IP Packet is Incomplete
  3013	TCP Header is Incomplete
  3014	TCP Header Checksum is Invalid
  3015	TCP Header has an Invalid Cookie
  3016	TCP Header has an Invalid SEQ Number
  3017	TCP Header has an Invalid ACK Number
  3018	TCP Header has Invalid TCP Options
  3019	TCP Header has Invalid TCP FLAGS
  3020	TCP Packet Belongs to no Active Session
  3021	UDP Header is Incomplete
  3022	UDP Header Checksum is Invalid
  3023	ICMP Header is Incomplete
  3024	ICMP Header Checksum is Invalid
  3025	ICMP Type is Invalid
  3026	ICMP Reply Without a Request
  3027	No socket for packet
  3028	Forwarding not Active
  3029	No Device for source IP address
  3030	ARP request device mismatch
  3031	ARP reply duplicate and MAC differs
  3032	Size Limit Exceeded
  3033	Rate Limit Exceeded
  3034	TTL Expired
  3035	Unknown ARP Operation
  3036	ICMP Packet Belongs to no Active Session
  3037	ICMP Packet is Ignored
  3038	ICMP Packet is Ignored by Rule Settings
  3039	High Level Protocol Header is Incomplete
  3040	High Level Protocol Header is Invalid
  3041	High Level Protocol Version is Invalid
  3042	High Level Protocol Packet is Incomplete
  3043	High Level Protocol Packet is Invalid
  3044	Source MAC Mismatch
  3045	Destination MAC Mismatch
  3046	Bridge ACL violation
  3047	ARP Burst Detected
  3048	Static bridge ARP mismatch
  3049	Change of locked ARP entry
  3050	Possible MAC Spoofing
  3051	No Next hop Allowed on Bridge Segment
  3052	Decompression failed
  3053	Session Creation Load Exceeded
  3054	Failed to update/create QARP entry
  3055	Failed to retrieve routing information for quarantine setup
  3056	Cannot send packets between different quarantine groups
  3057	QARP device entry does not match device to be used
  3058	Drop guessed TCP RST
  3059	Invalid SYN for Established TCP Session
  3060	Received Packet Exceeds NIC MTU (Invalid TCP-Segmentation-Offload ?)
  3061	TCP Header ACK Sequence Number out of Window Size
  3062	Unsupported IPV6 header
  3063	No Ruleset loaded
  3064	Source Barp Unknown
  3065	Source and destination Barp on the same device
  3066	Drop Otherhost
  3067	Firewall not active
  3068	Payload linearization failed
  3069	Reevaluation failed
  3070	Unknown fragment
  3071	Bridge Loop Detected
  3072	Interface is set to discard by RSTP"

  
  

  Deny Reasons

  
  

  5000	Unknown Deny Reason
  5001	Deny by Rule
  5002	Deny by Rule Source Mismatch
  5003	Deny by Rule Destination Mismatch
  5004	Deny by Rule Service Mismatch
  5005	Deny by Rule Time Mismatch
  5006	Deny Local Loop
  5007	Deny by Rule ACL
  5008	Deny by Dynamic Rule
  5009	Deny 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 forwarded.

• 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.

• 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.