VPN where local private address collide
freebsd-doc at fjl.co.uk
Fri Aug 16 17:17:59 UTC 2013
Let's say we're using MPD on FreeBSD at both ends of a link here, using
a VPN to connect two LANs. (The use of MPD is negotiable).
One LAN uses the address range 192.168.1.0/24 and the other uses the
address range, er, 192.168.1.0/24. However hard you try to avoid this,
it's going to happen. Let's also assume there is no way either end can
change its range. NO WAY. Just don't go there.
I've found I can still get away with this if the actual used IP
addresses don't conflict, but it's not ideal. I'm not even 100% on why
it works at all.
I've heard of a mythical solution called "VPN NAT". It makes sense; just
use NAT to map one range on to something completely different and away
you go. Hosts at either end would be none the wiser.
Has anyone actually done this, and if so, how?
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