[c-nsp] Virtual IP Question

[Gaddis, Jeremy L.]

I've used "heartbeat" successfully for a few years on two-node
active/passive failover setups.  Gratuitous ARPs are sent out when the
"standby" takes over.  We've been able to get extremely quick failover,
to the point where running a ping of the virtual IP while causing a
failover results in missing, at most, one reply.

These are RHEL4 web servers, BTW, and they also have a back-to-back
serial port link for monitoring the heartbeat.

--
Jeremy L. Gaddis
Network Administrator
Ivy Tech Community College of Indiana
812.330.6156 (w)  812.330.6212 (f)
 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Paul Stewart
Sent: Friday, April 11, 2008 7:31 AM
To: 'Robert Blayzor'
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Virtual IP Question

Thanks... used it before and had good success.... will suggest....:)

-----Original Message-----
From: Robert Blayzor [mailto:rblayzor.bulk at inoc.net] 
Sent: Thursday, April 10, 2008 10:22 PM
To: Paul Stewart
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Virtual IP Question

On Apr 10, 2008, at 9:42 PM, Paul Stewart wrote:
> Thanks... was going to go down that route previously but the server  
> admin
> doesn't want to do NAT and the servers are in a large subnet with  
> other
> servers so using public IP dispatch isn't an option neither if I  
> understand
> SLB properly...;)  Looked at both modes and didn't see how either  
> would work
> unfortunately....



If these are Linux or *BSD servers, you could look at CARP.

-- 
Robert Blayzor, BOFH
INOC, LLC
rblayzor at inoc.net
http://www.inoc.net/~rblayzor/

Mac OS X. Because making Unix user-friendly is easier than debugging  
Windows.









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