Changing local address on ppp connection

From: Stephan (sho_at_relinux.de)
Date: 05/30/05 

Date: 30 May 2005 08:39:47 -0700

Hello, World;-)

I've got a ppp connection to a GPRS-network. The provider dynamically
assigns a not routable address and does NAT for the internet.

Over this connection I have to build a VPN with a predefined local
address. If now sometimes this VPN-Address and the one for the
ppp-connection were the same I'd be in trouble.

The only solution seems to be changing the local address of the ppp
connection to a fixed value, but any trial to do so in ppp's config
file makes the network provider refuse the connection. I thought of
using NAT locally, but I don't think that would be a solution for the
problem having two network devices with the same IP address.

The easiest way would be some build-in NAT in the pppd that builds the
local network device with a given address but lets the remote server
see it's idea of the client's address. Unfortunatelly, but i did not
find such a thing.

Any idea?

Many thanks in advance

Stephan

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