Directions for using ppp over ssh,
telnet or whatever,
so as to do achieve transparent network connection accross a firewall.
Applies to friendly VPN construction
as well as to piercing unfriendly firewalls.
I hereby disclaim all responsibility
for your use of this hack.
If it backfires on you in any way whatsoever,
that's the breaks. Not my fault.
If you don't understand the risks inherent in doing this, don't do it.
If you use this hack and it allows vicious vandals
to break into your company's computers and costs you your job and
your company millions of dollars, well that's just tough nuggies.
Don't come crying to me.
I have stopped actively developing this mini-HOWTO,
although I'm still maintaining it.
I'm looking for a maintainer to take over this document,
who would extend it into a full-fledged HOWTO
by expanding on the solutions whose existence I only mention,
and who would maybe develop software to make it easier to pierce firewalls.
I have a lot of ideas to expand this HOWTO and write according software,
if anyone is interested.
I also used to write a french version of this HOWTO,
but no one has been maintaining it anymore for a long time.
Even though the only thing left is the disclaimers,
this document owes a lot to the
Term-Firewall mini-HOWTO
by Barak Pearlmutter <bap@cs.unm.edu>.
Barak's mini-HOWTO relies on
an ancient and no-more-supported program named Term
(a great program in its time,
and maybe still useful in some unhappy circumstances),
as well as on peculiarities of a not-so-standard telnet implementation,
that is, many obsolete and non-portable facts.
Nevertheless, there was a necessity for a mini-HOWTO about piercing firewalls,
and despite the limitations of its hacks,
this mini-HOWTO was a model and an encouragement.
I'd also like to congratulate
Lars Brinkhoff <lars@nocrew.org>
and Magnus Lundström <logic@gore.nocrew.org>
for their fine http, mail and icmp tunnels.
