> For me a tunnel should be totally transparent to the user. This
> is not true in the unpatched version of the ipip module but how
> can this be done without the hazard of building endless loops.
You need not to patch anything to make this.
This is option "ttl" to "ip tunnel". Please, look at ip-tunnels.tex
inside iproute2, it is not so long.
Alexey Kuznetsov
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