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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 NextGen Firewall F-Series. 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. Check the default value table below for more information.

Firewall Sizing

Maximum Number of Connections
  • Max Session Slots – Set the maximum number of session slots allowed (min: 512, default: 65536, max: 7000000). 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 consumer about 150 MB RAM.)

    If you set this parameter to the maximum allowed value, you will need to add vmalloc=896M to the the kernel boot parameters and execute a reboot. For more information, see How to Configure the Bootloader.

  • Max UDP (%) – Defines the percentage of the Max Session Slots allowed to be UDP sessions (min: 1; max. 100; default: 30).

    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 (%) – Defines the percentage of the Max Session Slots allowed to be ICMP sessions (min: 1, max: 100, default: 30).

    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 (%) – Defines the percentage of the Max Session Slots allowed to be an IP protocol type, except TCP, UDP, or ICMP. (min:1, max: 100, default: 10).

    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 F-Series Firewalls with more than 768 MB RAM requiring additional vmalloc space to satisfy the increased memory demand of non-default firewall settings, we recommend to increase 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 F-Series Firewall box can be determined with the following command: rpm -q kernel --qf %{ARCH}\\n.

Global Limits 1
  • Max SIP Calls – Set the maximum number of concurrent SIP calls that can be handled by the legacy SIP firewall plugin (min: 64, max: 16384, default: 512).

    Barracuda Networks recommends using the SIP proxy service instead of the SIP firewall plugin.

  • Max SIP Transactions – Set the maximum amount of SIP transactions that can be handled by the legacy SIP firewall plugin (min: 64, max: 16384, default: 512).

  • Max SIP Media – Define the maximum amount of SIP Media (RTP) connections allowed for the legacy SIP firewall plugin. The inactivity timeout for the media connections can be configured by setting the Balanced Timeout for the service object.

  • Max DNS Entries – Defines the maximum number of DNS queries that may be triggered by use of network objects containing hostnames (default: 512). 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 are exceeded, hostnames can no longer be resolved, causing access rules using these networks objects to never match.

  • Max Acceptors – Maximum number of pending accepts for inbound rules (min: 2000; max: 2000000; default: 8192). 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 beside 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 (min: 2000; max: 262144; default: 16384). This parameter only comes into effect when the TCP accept policy is set to inbound for the access rule.
  • Max BARPs – Defines the maximum number of bridging ARPs allowed (default: 2048). 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 – Maximum number of rules using plugins (min: 0, max: 65536, default: 8192).
  • Dyn Service Names (RPC) – Maximum number of dynamic service name entries (min:0, max: 65536, default: 8192).
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 (min:1. max: 100, default: 20). 
  • SYN Cookie High Watermark (%) – Percentage (of maximum pending inbounds) of pending inbound accepts to switch to SYN cookie usage for enhanced SYN flooding protection (min: 0, max: 100, default: 20).
  • SYN Cookie Low Watermark (%) – Percentage (of maximum pending inbounds) of pending inbound accepts to go back to ordinary SYN handling (min: 0; max: 100; default: 15).
  • Max Dynamic Rules – Maximum number of dynamically activated rules (min: 1; max: 1024; default: 128).
  • Max Multiple Redirect IPs – Maximum number of IP addresses in rules with multiple redirect target IPs (min:1, max: 1024, default: 128). 
  • Max SOCKS Workers – Maximum number of available SOCKS workers when the Generic TCP proxy mode is enabled. 
Source-Based Session Limits
  • Max Local-On Session/Src – Maximum number of sessions per source IP address. Cannot be set to more than Max Session Slots (min: 1; max. Max Session Slots; default: 8192).

    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 – Maximum number of UDP sessions per source IP address. (min: 1, default: 512).

    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 – Maximum number of ICMP Echo sessions per source IP (min:1, default: 512). 

    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 – Maximum number of sessions for all other IP protocols (not TCP, UDP, ICMP) per source IP address (min: 1, default 128). 

    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 – Maximum number of pending accepts per source IP address (min: 5, max: 1024, default: 64)

History Cache

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: min: 128; max: 65535; default: 2048.
  • Max. Block Entries – min: 128; max: 65535; default: 2048.
  • Max. Drop Entries – min: 128; max: 65535; default: 2048.
  • Max. Fail Entries – min: 128; max: 65535; default: 2048.
  • Max. Scan Entries – min: 128; max: 65535; default: 2048.
  • Max. ARP Entries – min: 128; max: 65535; default: 2048.
  • DNS Resolve IPs – Setting this parameter to yes (default: no) 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 – 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 BehaviorThis setting only applies 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 ; default) 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 defining 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.
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
Raw TCP Mode Policy  
  • RAW TCP Idle Timeout – 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 (default) – 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, default; 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.

    reverse_interface_policy.png

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. (min value: 2 max: 1000000000, default: 10)  To not generate an event, see How to Configure Basic, Severity, and Notification Settings for Events .
  • Port Scan Detection Interval – Detection interval in seconds to check for not allowed activity (min: 0; max: 1000000000; default: 60). 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)
    • Disabled – Disables this option.
    • Enabled – Improves shaping tree evaluation.
    • Enable-MultiQueue-Only – 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 is deactivated by default (no). It has to 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.

  • Log Synced Sessions – (advanced) This setting determines logging of access cache sessions, which have been synchronized between HA partners (default: Yes). Set to No to disable logging.

  • 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 F-Series Firewall only for routing and NOT for firewall purposes because generic network forwarding might cause severe security issues.

Operational IPS

By default, TCP stream reassembly and HTML parsing are set to auto. The operating system enables or disables these features to best match your current configuration and performance.

  • TCP Stream Reassembly for IPS  Reassembles the TCP stream before scanning for vulnerabilities.
  • HTML Parsing for IPS  Toggles HTML obfuscation detection. If this setting is changed, you must reboot for the changes to take effect.
  • IPS Scan Mode – Select the scanning mode for IPS. You must reboot for the changes to take effect.
    • Auto (default) – The firewall automatically chooses the best suited mode.
    • Fast Scan – Scan select packets to improve performance and throughput. 
    • Full Scan – Scan all packets.

Operational VPN

  • VPN Rate Limit (Mbps) – Limits how fast VPN traffic is encrypted and decrypted. Change this value if you experience excessive CPU load in an environment with many VPN tunnels. The default value 0 does not impose any restriction.

    Restart the VPN service after changing this value. (CONTROL > Server). All active VPN connections will be terminated when restarting the VPN service.

  • Enable Assembler Ciphers – By default, these assembler ciphers are enabled. 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).
  • Enable VIA PadLock – Enables or disables the usage of VIAs PadLock Security Engine.
  • Enable Cavium – Enable or disable Cavium crypto acceleration cards.

    Reboot for this setting to take effect.

  • Globally clear DF bit (default: no) – Clears the DF bit for each ipv4 packet routed through a VPN tunnel. For more information on MTU, see 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 (URL Filter)
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.
Application and Port Protocol Detection
Application Detection Destination Tracking
  • Enable Destination Tracking – Set to no unless specifically instructed otherwise by Barracuda technical support.
Supervisory Control and Data Acquisition (SCADA)
  • SCADA Protocol Detection – By default disabled. Enable to detect SCADA protocols.

    • Disabled – Default setting.

    • 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).

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 for monitor information data. A value of 0 (default) enables automatic assignment based on the device.
  • 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 .../server/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 – Use this section to selectively enable or disable event generation.
Log Policy
  • Application Control Logging – Select the global policy for Application Control 2.0 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. Default: only values are logged.

  • Log Level – Decides whether log messages are accumulated to avoid too large log files.
  • Cumulative Interval [s] – Interval (in sec) for which cumulative logging is activated for either matching or similar log entries. Minimum 1, maximum 60 sec.
  • Cumulative Maximum – Maximum of similar log entries to start cumulative logging. Minimum 1, maximum 1000.
  • 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 – Use this section to selectively enable or disable audit log generation.
  • Log ICMP Packets – Select the log 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 Streaming
  • Enable IPFIX/Netflow – Internet Protocol Flow Information Export (IPFIX, RFC 3917) is based on NetFlow Version 9. You can use this setting to stream the FW audit log via IPFIX. Note that using this also requires an adjustment of Audit Delivery within section Audit Log Data to Send-IPFIX.
  • Enable intermediate reports – Enable sending of intermediate reports with delta counters. (Use the IPFIX reporting interval [m] option to determine how often intermediate reports are sent.)
  • IPFIX reporting interval [m] – Interval in minutes between two intermediate IPFIX flow reports for each active flow.
  • IPFIX 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.
  • Collectors – Add external IPFIX collectors.
  • Settings – Click Set/Edit to configure connection tracing settings.

Out of Session (OOS) Packet Policy

  • Interfaces to Send TCP RST – 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 – 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 – The firewall sends TCP RST packets to these IPv6 networks if it detects packets not belonging to an active session.

Default Values for All Hardware Barracuda NextGen Firewall F-Series Models

Each model uses default values to match the hardware capabilities of the system.

NextGen Firewall F-Series
 F12F18F80F82F180/F180RF183/F183RF280F380F400F600F800F900F1000
General Firewall Configuration
Max. Session Slots40000400004000040000600006000017500030000025000050000010000002000000

7000000

Max. Session Slots possible
(with IPS, Virus Scanner, SSL Inspection)
8000080000800008000080000800001500000150000015000003400000350000035000003500000
Max. UDP (%)30303030303030303030303030
Max. Echo [%]303030303030303055555
Max. Other [%]10101010101010101010101010
Max. SIP Calls323232323232323210241024102410241024
Max. SIP Transactions323232323232323210241024102410241024
Max. SIP Media646464646464646420482048204820482048
Max. Pending Inbounds5125125125125125125125123276832768327683276832768
Max. Plugins1024102410241024102410241024102481928192819281928192
Dyn. Service Names (RPC)1024102410241024102410241024102481928192819281928192
Inbound Mode Threshold [%]20202020202020202020202020
Max. Dynamic Rules3232323232323232128128128128128
Max. Multiple Redirect IPs3232323232323232128128128128128
Max. Local-In Sessions/Src25625625625625625625625681928192819281928192
Max. Local-In UDP/Src128128128128128128128128512512512512512
Max. Local-In Echo/Src128128128128128128128128512512512512512
Max. Local-In Other/Src128128128128128128128128128128128128128
Max. Pending Local Accepts/Src32323232323232326464646464
Max. Access Entries51251251251251251251251240964096409640964096
Max. Block Entries51251251251251251251251240964096409640964096
Max. Drop Entries51251251251251251251251281928192819281928192
Max. Fail Entries51251251251251251251251240964096409640964096
Max. Acceptors1024102410241024102410241024102481928192819281928192

Max. ARP Entries

12812812812812812812812840964096409640964096
VPN Rate Limit (Mbps)5050100100150150200750700----
VPN Assembler Ciphers?------nn-----
Enable Protocol Detection1111111140964096409640964096
Application Policy00000000-----
Use Preselected Applications11111111-----

Forwarding Settings

Max. Forwarding Session/Src

819281928192819281928192

8192

8192

8192

8192

8192

8192

8192

Max. Forwarding UDP/Src

512512512512512512

512

512

512

512

512

512

512

Max. Forwarding Echo/Src

512512512512512512

512

512

512

512

512

512

512

Max. Forwarding Other/Src

128128128128128128

128

128

128

128

128

128

128

Max. Pending Forward Accept/Src

 64 64 64 64 64 6464646464646464
System Settings
Max. Routing Cache2000020000200002000020000200006250010000012500037500050000010000002500000
NextGen Control Center
 C400C610
General Firewall Configuration
Max. Session Slots81928192
Max. Session Slots (possible with IPS, AV, SSLice)--
Max. UDP (%)3030
Max. Echo [%]3030
Max. Other [%]1010
Max. SIP Calls3232
Max. SIP Transactions3232
Max. SIP Media6464
Max. Pending Inbounds512512
Max. Plugins10241024
Dyn. Service Names (RPC)10241024
Inbound Mode Threshold [%]2020
Max. Dynamic Rules3232
Max. Multiple Redirect IPs3232
Max. Local-In Sessions/Src256256
Max. Local-In UDP/Src128128
Max. Local-In Echo/Src128128
Max. Local-In Other/Src128128
Max. Pending Local Accepts/Src3232
Max. Access Entries512512
Max. Block Entries512512
Max. Drop Entries512512
Max. Fail Entries512512
Max. Acceptors10241024

Max. ARP Entries

128128
VPN Rate Limit (Mbps)--
VPN Assembler Ciphers?--
Enable Protocol Detection11
Application Policy00
Use Preselected Applications11
Forwarding Settings

Max. Forwarding Session/Src

-

-

Max. Forwarding UDP/Src

-

-

Max. Forwarding Echo/Src

-

-

Max. Forwarding Other/Src

--

Max. Pending Forward Accept/Src

--
System Settings
Max. Routing Cache-

-

NextGen Firewall F-Series (legacy)
 F10F100F200F300
General Firewall Configuration
Max. Session Slots2048819281928192
Max. Session Slots (possible with IPS, AV, SSLice)80000800008000080000
Max. UDP (%)30303030
Max. Echo [%]30303030
Max. Other [%]15151515
Max. SIP Calls32323232
Max. SIP Transactions32323232
Max. SIP Media64646464
Max. Pending Inbounds512512512512
Max. Plugins1024102410241024
Dyn. Service Names (RPC)1024102410241024
Inbound Mode Threshold [%]20202020
Max. Dynamic Rules32323232
Max. Multiple Redirect IPs32323232
Max. Local-In Sessions/Src256256256256
Max. Local-In UDP/Src128128128128
Max. Local-In Echo/Src128128128128
Max. Local-In Other/Src128128128128
Max. Pending Local Accepts/Src32323232
Max. Access Entries512512512512
Max. Block Entries512512512512
Max. Drop Entries512512512512
Max. Fail Entries512512512512
Max. Acceptors1024102410241024

Max. ARP Entries

128128128128
VPN Rate Limit (Mbps)3080130130
VPN Assembler Ciphers?----
Enable Protocol Detection1111
Application Policy0000
Use Preselected Applications1111
Forwarding Settings

Max. Forwarding Session/Src

8192

819281928192

Max. Forwarding UDP/Src

512

512512512

Max. Forwarding Echo/Src

512

512512512

Max. Forwarding Other/Src

128

128128128

Max. Pending Forward Accept/Src

 64 64 64 64
System Settings
Max. Routing Cache4096409640964096
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