slow dhcp on 1G backbone.

[Brad Dameron]

Based on what you stated, you tried a 100Mb and a 1Gb card in the server and it did not work with the HP switch. Then you tried a 100Mb switch and it worked fine. This is all a misconfiguration at the switch level.
 
Brad

________________________________

From: dhcp-users-bounces at lists.isc.org on behalf of Dean Montgomery
Sent: Fri 7/24/2009 12:33 PM
To: Users of ISC DHCP
Subject: Re: slow dhcp on 1G backbone.



I've attached a wireshark capture on: udp port 68 and port 67
as well as syslog dhcp entries.

You will see 2 requests:
1) Once from bios for pxeboot.
2) Once from the kernel has loaded.



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I tried turning off spanning tree on the switches.  It still takes 12 or more seconds from the time the diskless client starts looking for an IP to the time that it actually gets one that it can work with.

===

Windows machines are also affected by slow dhcp requests:
 ipconfig /release
 ipconfig /renew
  .... wait .... wait ...  wait ...

===
Another note - wake on lan is turned on on all the clients so the nic and switch link lights are always on.


--
Dean Montgomery
Network Support Tech./Programmer
dmonty at sd73.bc.ca
School District #73


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