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Date:      Tue, 2 Nov 1999 14:09:42 +0200
From:      Graham Wheeler <gram@cequrux.com>
To:        hackers@freebsd.org
Subject:   Hiding dynamic IPs
Message-ID:  <99110214212100.22671@cequrux.com>

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Hi all

I have a program which requires static IP addresses for various reasons. It
could be changed to handle dynamic IPs but this would be a fairly significant
undertaking and would probably be quite kludgy, involving the generation of
scripts that have to be run every time the link goes up and down, etc.

Anyway, I want to use it now over a PPP link with dynamic address allocation.
I'm trying to figure out a good way to do this. I reckon that it should be
possible by using some kind of local tunnel that has a fixed IP on one end that
the program can talk to, that will in turn talk to the PPP link.

I tried creating an additional tun device and ifconfigging it with the two 
addresses, but it doesn't seem to work at all (if I ping either address I get
no response, nor do I see any Ipkts or Opkts in the netstat -in output).

Is there some other way of doing this? Ideally I want to avoid ipfw tricks,
as ipfw is being used for other purposes on this host and I would like to
keep the problems separate.

TIA
gram
 -- 
Dr Graham Wheeler                        E-mail: gram@cequrux.com
Cequrux Technologies                     Phone:  +27(21)423-6065/6/7
Firewalls/Virtual Private Networks       Fax:    +27(21)24-3656
Data/Network Security Specialists        WWW:    http://www.cequrux.com/


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