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Stateful Inspection Options
Stateful Inspection Parameters are active on a WAN interface only if you enable them on
your Gateway.
• Stateful Inspection: To enable stateful inspection on this WAN interface, check the
checkbox.
• Default Mapping to Router: This is disabled by default. This option will allow the
router to respond to traffic received on this interface, for example, ICMP Echo requests.
☛ NOTE:
If Stateful Inspection is enabled on a WAN interface Default Mapping to
Router must be enabled to allow inbound VPN terminations to the router.
• TCP Sequence Number Difference: Enter a value in this field. This value represents
the maximum sequence number difference allowed between subsequent TCP packets.
If this number is exceeded, the packet is dropped. The acceptable range is 0 – 65535.
A value of 0 (zero) disables this check.
• Deny Fragments: To enable this option, which causes the router to discard fragmented
packets on this interface, check the checkbox.