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[LUG] SNAT and GRE

 

Trying to find clear documentation on GRE and iptables.

Currently NAT is performed using:

-A POSTROUTING -s 10.x.y.0/24 -j SNAT --to-source 78.a.b.c

Would one expect this rule to handle GRE packets?

Wish to include GRE so that L2TP clients can connect to remote RRAS server.

Sure I can muddle through, but seems to me it should be documented better
than it is, but maybe I missed the relevant document. At least I'd prefer
to understand why it isn't "just working".

I have a recent stock Debian kernel so stock connection tracking including
pptp/gre kernel modules. User reports it use to work, but I'm sceptical,
only thing to change lenny -> squeeze.


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