This post is the first in a series of posts about antinat. The posts will provide solutions for some "problems' with antinat. So here goes the first one ....
Antinat creates outgoing connection from the primary ip defined on the machine where it's running. There's a config option to make antinat listen on a specific ip but no config option to make it use a specific ip for outgoing connections.
The attached patch will make antinat use the same ip that it's listening on for outgoing connections. You specify the listening ip with the "interface" config option and now that ip will also be used for outgoing connections.
I assume you already know how to patch ... if not ... just ask in the comments or hire me to patch it for you