VPN and IPtables

Wed Sep 15 21:01:43 UTC 2004

On Wed, Sep 15, 2004 at 04:57:47PM -0400, Zbigniew Koziol wrote:
> Isnt VPN using a protocol gre ? I had the problem with openBSD working 
> as a firewall. openBSD by default does not allow to use gre protocol 
> (Windows does). Linux probably does not either.

As far as I read, only some (cisco anyone?) implementations of ipsec try
to do that.  Not 100% sure though.  Certainly I have run freeswan and
openswan using just udp 500 and protocol 50/51.  Even connecting to a
cisco VPN concentrator that worked.

Lennart Sorensen
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