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List:       dhcp-users
Subject:    Re: Quick failover question
From:       David Halik <dhalik () oit ! rutgers ! edu>
Date:       2010-12-13 17:50:15
Message-ID: 4D065CD7.1090609 () oit ! rutgers ! edu
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Thanks, that's exactly what I was hoping for, so we should be able to 
move forward.

On 12/13/2010 12:38 PM, Chris Buxton wrote:
> With failover, only one of the two servers should respond to a request. They work \
> it out based on a hash of the MAC address, as I recall. 
> Without failover, e.g. with what Microsoft calls a split scope, you would have the \
> problem you mentioned - two responses, first received wins. But with failover, you \
> won't have that problem. 
> Chris Buxton
> BlueCat Networks
> 
> On Dec 13, 2010, at 8:20 AM, David Halik wrote:
> 
> > Hello,
> > 
> > We're currently running 3.1-ESV in support of our VOIP phone system and I'm \
> > looking at setting up failover for redundancy. I think I have a pretty good grasp \
> > of how everything works, but there is one issue that I haven't been able to find \
> > a concrete answer on. 
> > When a DHCPDISCOVER goes out on the wire from one of the clients, how is it \
> > determined whether the primary or secondary DHCP server responds? Is it random? \
> > Do they both respond? Do they work it out amongst themselves? I read in the \
> > changelog that "Dynamic BOOTP leases are now load balanced in failover", but this \
> > doesn't tell me anything about how the process actually happens. 
> > The reason I'm asking is that we've had an issue with buggy clients where they do \
> > not handle receiving multiple responses very well. If it's only ever the primary \
> > or secondary responding at one time, then all should work as planned. If both \
> > respond and it's a "first one wins" situation, then I won't be able to use \
> > failover with these clients. 
> > Any help would be appreciated, thanks,
> > -Dave
> > 
> > -- 
> > ====================
> > David Halik
> > Network Architecture&   Applications
> > Telecommunications - OIT
> > Rutgers University
> > 732-445-7530
> > ====================
> > 
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-- 
====================
David Halik
Network Architecture&  Applications
Telecommunications - OIT
Rutgers University
732-445-7530
====================

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