Kernels 2.2.x and lower need special patches to support GRE for PPTP.
See David Ranch's latest IP masquerade HOWTO
http://www.ecst.csuchico.edu/~dranch/LINUX/index-linux.html#ipmasq
(Be sure to read the "Resources" section)
Also check the archives at http://www.indyramp.com/masq/
---
Alexandre asked:
> How do I connect my VPN clients behind a ipchains firewall on external VPN
servers?
>
> My rules at ipchains are ok, are there something more to do ? Any patches
or special configuration?
>
> I didn�t found anything that works fine.
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