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Pass through AH traffic dropping

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Article ID: KB11478 KB Last Updated: 25 Jun 2010Version: 4.0
Summary:
Pass through Authentication Header (AH) traffic dropping
Symptoms:
Pass through Authentication Header (AH) traffic is being dropped by the firewall managed by NSM.
Solution:
There are predefined AH and ESP services defined in NSM . These NSM predefined services are only for VPN traffic, and in certain versions of NSM, these services are created with the dst-port 0-0.  Sometimes customers may also create the same predefined service on the firewall with dst-port 0-0 and the pass through AH or ESP traffic will get dropped by the global deny policy.

Work-around:
If you wish to allow pass through AH or ESP traffic through the firewall you will need to create custom services on the firewall as below:
set service AH-custom protocol 51 src-port 0-65535 dst-port 0-65535
set service ESP-custom protocol 50 src-port 0-65535 dst-port 0-65535

Fix:
In NSM2007.1r3, the AS/ESP service is defined with dst-port 1-65535 and src-port 1-65535.
In NSM2008.1, the AS/ESP service is defined with dst-port 0-65535 and src-port 0-65535.
So with these two NSM versions, predefined services for ah/esp should work for pass-through VPN traffic, and there is no need to add custom services for ah/esp.
 
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