DHCP assigning improper addresses for the VLAN
Posted on 2011-04-20
HP procurve 5406 at the core and HP 2848 at the edge, clients are all WinXP SP3, PXE clients are Altiris Deployment server clients
I wouldn't believe it if had not seen it with my own eyes. A recent rash of clients not getting DHCP addresses in a timely manner had me looking at one users PC. This PC is attached to a switch which is the 103 vlan, but it gets and an address from the 102 vlan! This is in both windows and PXE. Once I network boot and have Win PE loaded, DHCP fails to get an address.
I checked some more machines on the 103 vlan and on some I saw it get a vlan 102 address in PXE and then get a 103 vlan address in Windows.
In other instances I saw machines on the 103 vlan get vlan 102 addresses in PXE and fail to get addresses in windows. Upon trying ipconfig /renew on these same machines, I would receive an access denied error.
Last time I saw the access denied message, related to dhcp, I had a broadcast storm caused by someone connecting two ethernet ports in the same room.
Sort of scketchy details, but maybe someone out there has seen a similar scenario. The other vlans on the network are all working fine all the problems are on 102. I'm pretty sure I have something plugged in somewhere it shouldn't be, but have yet to find it.