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On Wed, Jan 31, 2007 at 10:58:08AM -0000, Bond, Peter wrote:
> > -----Original Message-----
> > From: hampshire-bounces@???
> > [mailto:hampshire-bounces@mailman.lug.org.uk]On Behalf Of
> > David Ramsden
>
> > I don't quite understand what is trying to be acheived. Is this to
> > implement a failover solution? If one network card fails, you
> > can go and
> > physically unplug the cable from one NIC and place it in the
> > other and
> > then ifup the interface?
>
> Essentially, yes. Both interfaces to be live simultaneously, with one taking over as active master on network outage. No definition yet on what an outage constitutes - could just be link down.
>
> > You want to look in to bonding, where you can have two NICs
> > for example,
> > both plugged in to the same physical network. When bonding has been
> > implemented you will see one logical interface. However, if one NIC
> > fails everything should continue to work as normal. Note the *should*
> > :-) You may find you need switches that support link aggregation.
>
> I'm not sure that bonding is quite what is going on here - it's some horrible offspring of bonding as defined so far. IP aliasing is a start point for this, but there is still MAC takeover "needed".
>
If you want to implement a fully automated failover solution, bonding is
what you need (there may be other solutions of course).
The Linux bonding module doesn't limit itself just to port trunking.
There is an "active backup" mode:
"One slave interface is active at any time. If one interface fails,
another interface takes over the MAC address and becomes the active
interface. Provides fault tolerance only. Doesn't require special switch
support."
Sorry if I'm teaching you to suck eggs on this.
Regards,
David.
--
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