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ServerIron ADX Security Guide 35
53-1002440-03
Syn-cookie threshhold trap
1
Enabling track firewall group
To enable track-fw-group to track the firewall group state, use the following commands.
ServerIronADX(config)#int ve 1
ServerIronADX(config-vif-1)# ip vrrp-e vrid 1
ServerIronADX(config-vif-1-vrid-1)# track-fw-group
Syntax: track-fw-group <group-num>
Use the track-fw-group command under the VRRPE config level. <group-num> is the firewall group
that needs to be tracked for this VRRPE. This command is used along with the fw-vrrpe-priority
command to force VRRPE state to track the FW group state. This command works similar to the
track-port command. When the firewall group state is STANDBY, then the VRRPE current priority is
decremented by the fw-vrrpe-priority specified under that firewall group. It is recommended that
you track only the firewall group state and no other port, because tracking firewall group state
automatically tracks the router ports, firewall paths, and more.
Enabling firewall session sync delay
To enable server fw-sess-sync-delay, use the following command.
ServerIronADX(config)#server fw-sess-sync-delay 10
Syntax: server fw-sess-sync-delay <secs>
Use the server fw-sess-sync-delay command added at the global config level. <secs> is the number
of seconds to delay the fast session sync after one of the ServerIrons is reloaded in HA FWLB. Valid
values range from 1 to 100. This command can be useful in configurations where many real
servers or firewalls are configured.
Syn-cookie threshhold trap
To configure the syn cookie attack rate threshold, use the following command.
ServerIronADX(config)# server syn-cookie-attack-rate-threshold 10000
Syntax: syn-cookie-attack-rate-threshold <threshhold>
The <threshhold> variable is a decimal number ranging from 1 to 10000000.
If the current syn cookie attack rate is larger than the syn cookie attack rate threshhold, the
snTrapSynCookieAttackThreshReached trap is generated.
To configure the snTrapSynCookieAttackThreshReached trap interval, use the following command.
ServerIronADX(config)# server max-conn-trap-interval 10
Syntax: server max-conn-trap-interval <decimal number in seconds>
The <seconds> variable is a decimal number in seconds. The default value is 60 seconds.
Service port attack protection in hardware
A ServerIron can be enabled to deny traffic that is destined to VIP address but to a port that is not
defined under a VIP. Such traffic can be dropped in hardware without impacting the MP or BP CPUs.