DHCP snooping & PXE server

Unanswered Question
Nov 26th, 2009
User Badges:


Did anyone solved this scenario?


DHCP server -----------|      ASA     | ------------------------------ stations + PXE server


1) when DHCP snooping is off, everything works fine - PXE client receives address from DHCP server and also address of PXE server

2) when I turn on DHCP snooping, PXE client receives IP address from DHCP server, but doesn't know about PXE server

Modification of parameters 66,67 in DHCP server didn't help - client located PXE server, but stopped on loading bootwiz.sys and timeouted.

Thank you.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Giuseppe Larosa Thu, 11/26/2009 - 06:50
User Badges:
  • Super Silver, 17500 points or more
  • Hall of Fame,

    Founding Member


preliminary question:

have you tried to trust the port where the PXE server is connected?

second question:

what switch model is involved and what IOS image is running?

I remember threads where some SW bugs related to PXE and DHCP snooping have been mentioned.

Having this information would help to narrow the search in bug toolkit tool.

I can confirm that there were issues for some switches with specific IOS versions

Hope to help


zvondovec Thu, 11/26/2009 - 07:04
User Badges:


1) of course I did - didn't help

2) c2960-lanbasek9-mz.122-52.SE.bin



This Discussion