[CentOS] Redundant LAN routing possible?

Sat Jul 10 23:01:41 UTC 2010
Boris Epstein <borepstein at gmail.com>

On Sat, Jul 10, 2010 at 5:21 PM, Emmanuel Noobadmin
<centos.admin at gmail.com> wrote:
> I've been reading that it's possible to set up a system with multiple
> NIC to provide redundant internet connectivity such that it will
> switch to a secondary connection if the primary ISP fails.
> Is it possible in a similar way to setup redundant LAN routing? I read
> that it is possible to aggregate/bond multiple NIC to stackable
> switches that support link aggregation and redundancy. But if only
> simple switches are available, is something like this possible?
> e.g.
> System A
> eth0 -> lan switch/router 1
> eth1 -> lan switch/router 2
> System B
> eth0 -> lan switch 1
> eth1 -> lan switch 2
> Then somehow specify that, if lan switch 1 fails, the two systems will
> switch to using switch 2 so that in case of a switch failure, the
> network continues to remain operational.
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I'd think for this to be possible you will need a router with multiple
WAN addresses/interfaces... I am not sure how that pertains to your
LAN per se.