How do I configure dd-wrt to forward IP Protocol ID 50 & 51 traffic to an internal machine?

jnman asked:

Please note, I’m not talking about TCP or UDP traffic. Rather IP traffic with the protocol ids of 50 and 51.

The point of this being that I can then pass IPsec traffic thru to the internal machine where it would act as the VPN terminator.

My answer:

Another option is to set the endpoint as the “DMZ host” in DD-WRT. This will pass and masquerade all traffic, including your exotic protocols.

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