The SKRONK protocols (version 0.6)

Perry E. Metzger perry at
Sun Feb 5 16:48:44 PST 1995

Matthew J Ghio says:
> "Perry E. Metzger" <perry at> writes:
> > Pardon but... why? Whats the reason for wanting to do this?
> > 
> > If a firewall has been set up to stop UDP, then it should stop UDP. If
> > the firewall has not been set up to stop UDP, or has a mechanism like
> > the experimental versions of "socks" currently being played with that
> > relay UDP, then there is no reason to want to do the above. I don't
> > really understand what the idea is here.
> Presumably you would only let trusted people tunnel through your firewall.

Fine -- then packet filter on your firewall. Of course, you can't
really trust the IP addresses anyway -- you need something IPSP-like
if you actually want to trust outside hosts (swIPe does nicely as a
stopgap). And even if one wanted to move packets through a firewall
over TCP, why use SLIP encapsulation? It was designed for unreliable
links -- on a reliable link, you can save lots of grief by just
sending the packet -- total length of an IP datagram is included
inside the datagram, thus rendering further encapsulation unnecessary.


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