router availability
Scot L. Harris
webid at cfl.rr.com
Wed Feb 16 17:51:46 UTC 2005
On Wed, 2005-02-16 at 11:53, Bob Chiodini wrote:
>
> True HSRP and/or VRRP are ways to let the network guarantee that the
> default router is always available should there be failures. Some
> number of unique routers will appear as a single entity to individual
> hosts and will continue to route as long as all of the routers do not
> fail. The IP address assigned to the HSRP router is virtual and will
> physically reside on one of the redundant set. I think the routers can
> choose the best physical box to process the packets and depending on the
> configuration this physical router may vary over time and system load.
>
> I stand corrected. As to the metric option assigned to the default
> gateway, apparently it is not used by the kernel (man route). It looks
> like the kernel always picks the first default gateway in the table,
> whether it's up or not. However, a brief look at the kernel source,
> looks like if you compile the kernel with CONFIG_IP_ROUTE_MULTIPATH
> (2.6.10-1.766_FC3 was) you may be able to tweak what's happening to
> routing.
>
> http://lartc.org/howto/lartc.rpdb.multiple-links.html might provide some
> incite, and looks like what Douglas is trying to do.
Good info BTW. :)
I can see how that would work given two different subnets for interface
1 and 2. I still don't see how that is going to work given that
interface 1 and 2 are in the same subnet.
--
Scot L. Harris
webid at cfl.rr.com
zeal, n.:
Quality seen in new graduates -- if you're quick.
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