meaning of "xid mismatch"??

Frank Bulk frnkblk at
Mon Feb 25 17:22:28 UTC 2008

It means "transaction id".  Every DHCP exchange is supposed to have a unique
transaction ID, something easily seen with Wireshark.  If the DHCP server
receives a response for a device with a different transaction ID than what
was expected, it spits out this error.



-----Original Message-----
From: dhcp-users-bounce at [mailto:dhcp-users-bounce at] On Behalf
Of Jeff A. Earickson
Sent: Monday, February 25, 2008 10:16 AM
To: dhcp-users at
Subject: meaning of "xid mismatch"??


I recently upgraded from dhcp 3.0.6 to 3.1.0, now I'm seeing
lots of:

bind update on [IP] got ack from colby: xid mismatch.

I googled and searched the MARC mailing list archives for
a plain-english description of what this means (and what to
do about it), but didn't find one.  So what does it really

Jeff Earickson
Colby College

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