[ale] failover planning

[Christopher Fowler]

Speaking of failover is it possible to install 2 NICS in Linux and put
them on the same subnet.  I.E. eth0 = 192.168.1.4 and eth1 = 192.168.1.5
then place those NICS under load balancing.  In this case both will have
the same DNS and same gateway.  All load balancing setups I've seen load
balance between multiple Internet connections.


On Mon, 2004-11-29 at 19:40, Greg Freemyer wrote:
> On Mon, 29 Nov 2004 09:51:34 -0500, James P. Kinney III
> <jkinney at localnetsolutions.com> wrote:
> > I am looking at setting up a small non-local redundant webserver. The
> > net access for each node is through different ISP's so each node has
> > different IP's. In fact, there is nothing in common between the two
> > different networks. They have no common router.
> > 
> > The main site is serverd by a T1 line that is susceptable to an outage
> > caused by falling trees. I would like to make the outage as short as
> > possible by making the backup site live as fast as possible. Right now,
> > other than editing the DNS listing and waiting for the change to
> > propogate, I have no other way to do this.
> > 
> > Any suggestions?
> > --
> > James P. Kinney III          \Changing the mobile computing world/
> 
> If nothing else, you could try round-robin DNS.
> 
> That way roughly half of your dns quiries will go to each IP.
> 
> Then set your client TTL low so your users are requesting a new DNS
> entry fairly often.
> 
> If one of your sites fails,  there is a 50% chance your users will go
> to the other site with their next DNS request.  (ie. if you have M$
> users, they do a dns request at least once per reboot.)
> 
> Greg