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OpenSSH 4.3 VPN?

Subject: OpenSSH 4.3 VPN?
Date: Fri, 10 Feb 2006 16:48:14 -0800
I work for an ISP and I want to setup a small administration VPN.
Specifically I have servers that have no Internet Access that I need
to get access to from home. See my cheesy diagram below.

http://www.web-ster.com/bakers/network-diagram.png

I want to connect from my home PC to Server A which has SSH open,
and be able to communicate with both Server B and Server C directly.
I don't want to do port tunneling, I'd really like to use the new
tun0 functionality of OpenSSH 4.3.

I'm able to get the tunnel setup and working, but I'm not clear what
to do from there? On my home PC if I do:

ssh -f -w0:0 12.1.1.10 true

That will setup the tunnel between the two points. What do I need to
do with that tun0 interface to all my home PC access to all my
servers. I don't want to have to change my routes on all my servers,
is that possible? Does the tun0 interface need IPs on it? If so what
subnets should they be on?

Scott

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