Correct Failover / DHCPOFFER functionality

[pat]

Hi David,

  Thanks for your reply.

I guess you are mentioning the field seconds elapsed in DISCOVER message ?,
I have pasted the capture below and it is 18 for some clients and 0 for some
clients DISCOVER.

Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 1
Transaction ID: 0x41573e21
*Seconds elapsed: 18*

Bootstrap Protocol Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 1
Transaction ID: 0x9364cf6c
*Seconds elapsed: 0*

some othe clients have nonzero value like 2, 4 etc...

My load-balance-max-secs is 3  and the SPLIT is 128 from dhcpd.conf file,
can you tell me what happens for the client with seconds elapsed is 18 and
for the client with field same field set as 0.


what does this Sec field mention, is it configurable from client or server
side to go through hashing always?

Regards
Pat


On Fri, Jul 3, 2009 at 12:51 AM, David W. Hankins <dhankins at isc.org> wrote:

> On Fri, Jul 03, 2009 at 12:42:42AM +0530, pat wrote:
> > If failover is enabled within a pair of DHCP servers why should both
> servers
> > respond to the DISCOVER with an OFFER.
> > only the server based on hashing should respond with an OFFER for a
> DISCOVER
> > isn't it ?
>
>  https://lists.isc.org/pipermail/dhcp-users/2009-June/009458.html
>
> It depends upon the configured 'load-balance-max-secs' and whether or
> not the client sends a nonzero 'secs' bootp header field.
>
> --
>  David W. Hankins        "If you don't do it right the first time,
> Software Engineer                    you'll just have to do it again."
> Internet Systems Consortium, Inc.               -- Jack T. Hankins
>
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