Multiple default routes on multihome host

[Bill Moran]

In response to Eygene Ryabinkin <rea-fbsd at codelabs.ru>:

> Bill,
> 
> Mon, Feb 18, 2008 at 04:36:18PM -0500, Bill Moran wrote:
> > I would suggest you ask yourself (and possibly the list) _why_ you think
> > multiple default routes is necessary ... what is it that you're hoping
> > to accomplish.  I'm guessing your looking for some sort of redundancy,
> > in which case something like CARP or RIP is liable to be the correct
> > solution.
> 
> I had faced such situation once: I had multihomed host that was
> running Apache daemon that was announced via two DNS names that
> were corresponding to two different IPs, going via two different
> providers.  When the first provider's link goes down, the second
> provider is still alive, and when both providers are alive, the
> traffic is balanced via DNS round-robin alias.  Do you see some
> better way to do it via CARP, RIP, something different?  I am still
> interested in other possibilities.

The canonical way to do this is with BGP.  I can be done with CARP
if both providers support it and are willing to work together.

-- 
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran at collaborativefusion.com
Phone: 412-422-3463x4023