From owner-freebsd-net@FreeBSD.ORG  Sun Jun 12 09:22:14 2005
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Date: Sun, 12 Jun 2005 11:19:32 +0200
To: stephen@dino.dnsalias.com (Stephen J. Bevan),
	"Greg 'groggy' Lehey" <grog@FreeBSD.org>
From: Gianmarco Giovannelli <gmarco@masternet.it>
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Cc: FreeBSD-net@FreeBSD.org, Jeremie Le Hen <jeremie@le-hen.org>
Subject: Re: Problems with gif tunnels
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At 09.14 11/06/2005, Stephen J. Bevan wrote:
 >Greg 'groggy' Lehey writes:
 > > Ah, my bad.  But nos-tun also does IP-IP, so he was using the correct
 > > tool.  So that doesn't seem to be the problem here.
 >
 >By default non-tun uses protocol 94 which is not compatible with
 >gif(4) and Linux IPIP, both of which protocol 4.  There is an option
 >(-p) to tell nos-tun to use protocol 4 but either Gianmarco didn't use
 >it or there was some other kind of problem.

Stephen get the point. I didn't set the p:4 with the -p switch and probably 
the other part on linux didn't know much more me on this setup.
It was my fault but at that time I really don't know so much about ipip 
tunnelling.
Now after all of your explanations I see correctly how things works.

Btw.
It should be a very good thing if in the man page there were some examples 
also about connecting linux systems (not only cisco systems) so we can 
easily tune up things.

Thanks.