Bill Dossett wrote:

Hi,

First thing, I can't find a config example now,
but pretty sure you can have a linux freeswan gateway
to linux freeswan gateway with private addresses behind
them, that's right isn't it?

That's right!


But if so, I don't understand how it works...
If I'm on one subnet and I ping 10.0.0.5 on
another subnet... I can see how that works
once, but how does ipsec know which private
network you are pinging if you connect to
more than one network, say two networks are
using the 10.0.0.0/24 space?  How does it know
which one you mean?  or can't you VPN to two
of the same private network?  It was keeping
me awake last night as I think I have to do it
or else persuade one of the nets to change.

It's not possible for two VPN gateways to have the same subnetwork behind them. Since routing is based on eroutes an error message will be generated for the second connection trying to establish a tunnel to the 10.0.0.0/24 network.

Thanks
Bill

Regards


Andreas

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