How long should a client wait for a DHCPOFFER?
Aaron Bennett
abennett at clarku.edu
Fri Oct 13 18:44:35 UTC 2006
Frances Albemuth wrote:
> Hi all,
>
> This isn't so much an issue or question specific to the ISC DHCP
> server, but more a general question. I'm having trouble finding an
> authoritative source or even a general understanding regarding
> guidelines for how long a client should wait to hear a DHCPOFFER. I'm
> dealing with a particular vendor of consumer class routing devices
> whose DHCP client implementation isn't tolerant of any delay (e.g.
> DHCP relay, a la Windows 95, I suppose). I would like to have
> something to direct them to in hopes of persuading them to modify the
> wait time in their next firmware release.
>
> Thanks!
>
http://www.faqs.org/rfcs/rfc2131.html
I think the relevant section is:
> The client times out and retransmits the DHCPREQUEST message if the
> client receives neither a DHCPACK or a DHCPNAK message. The client
> retransmits the DHCPREQUEST according to the retransmission
> algorithm in section 4.1. The client should choose to retransmit
> the DHCPREQUEST enough times to give adequate probability of
> contacting the server without causing the client (and the user of
> that client) to wait overly long before giving up; e.g., a client
> retransmitting as described in section 4.1 might retransmit the
> DHCPREQUEST message four times, for a total delay of 60 seconds,
> before restarting the initialization procedure. If the client
> receives neither a DHCPACK or a DHCPNAK message after employing the
> retransmission algorithm, the client reverts to INIT state and
> restarts the initialization process. The client SHOULD notify the
> user that the initialization process has failed and is restarting.
--
Aaron Bennett
Sr. Unix Systems Administrator
Clark University ITS
abennett at clarku.edu | 508.781.7315
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