On 7/10/2010 2:21 PM, Emmanuel Noobadmin 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. Yes. You can do it. I've done it before. All you need is the right choice of bonding mode . You set up bond0 for eth0 and eth1 and it 'just works'. To make it more robust, cross-connect the two switches as well. -- Benjamin Franz