[Gllug] routing via a second external IP

John Winters john at sinodun.org.uk
Wed Aug 13 08:38:02 UTC 2008


Paul Cupis wrote:
> John Winters wrote:
>> Paul Cupis wrote:
>> [snip]
>>> No, but if you have two DSL connections (seperate, each with their own 
>>> IP(s), and you route specific traffic (by IP or port) down the second 
>>> one (the first being default route), then that traffic will return via 
>>> the same connection and thus NAT will work just fine.
>> Yes, but that's not the case being talked about here.  The OP asked for
>> a solution where the connection is initiated from *outside*.  Which
>> incoming link is used will therefore be dictated by what IP address the
>> outside initiator uses.  If that doesn't agree with the way the internal
>> routing tables are set up then you'll end up with traffic coming in down
>> one link and out down the other.  Even this will work only if the target
>> internal machine has a real IP address, or all NATing is performed
>> entirely behind the merge point of the two links.  If NATing is done on
>> the links individually (or on one and not the other) then connections
>> simply won't work.
> 
> Correct.

Thank you.

> But....

I'm not sure why you used "But" there, because then you just want on to
reiterate what I've been saying all along.

John

-- 
Gllug mailing list  -  Gllug at gllug.org.uk
http://lists.gllug.org.uk/mailman/listinfo/gllug




More information about the GLLUG mailing list