router availability

[Bob Chiodini]

On Wed, 2005-02-16 at 12:51 -0500, Scot L. Harris wrote:
> 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. 
> 

Yep, you're right.  Sometimes I should pay attention to the details :-)

Bob...