[lvs-users] ipvsadm and packets leaving a gre tunnel

Marco Lorig MLORIG at gmx.net
Wed Jul 23 14:19:34 BST 2008

-------- Original-Nachricht --------
> Datum: Tue, 22 Jul 2008 11:19:52 -0700 (PDT)
> Von: Joseph Mack NA3T <jmack at wm7d.net>

> If director1 is the default route, then packets get to 
> director2 via NAT and then if the realservers there are 
> down, the packets come back by gre to director1?

Not exactly. In normal operating, director1 serves clients and realservers with ipvsadm at location1. So does director2 at location2 with its own  clients and realservers.
In a backup scenario, there are no more realservers at location 1 which can be served by the director1 at location1.
Director1 now starts routing through gre to director2 at location2. In this case, it is ensured that director2 has realservers available, which serve the request.

> this is a little out of my area. Does nopmtudisc mean that 
> the source side of the gre tunnel doesn't hear about the 
> results of pmtu?

If I understand correctly, nopmtudisc within GRE-tunnels masks fragmentation to client and server.

> new connection or the current connection as well?

The connection is terminated after the transfer, so only new connections don´t work , I reckon.



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