Vista Issue - Wired vs. Wireless

[Randall C Grimshaw]

I have seen something like this on wired networks. Please check the destination broadcast address coming in the offer from the relay. If the relay has written the destination address as a class C broadcast address instead of the expected all ones broadcast address - some vista clients will not accept the packet for the reason that it is technically malformed - thus the registry override fix. I would contact your relay vendor and see if they have a workaround for you. For me this is a very limited issue at present and we have not yet fixed it.
Randy

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From: dhcp-users-bounce at isc.org on behalf of Frank Bulk
Sent: Sat 9/6/2008 10:24 PM
To: dhcp-users at isc.org
Subject: RE: Vista Issue - Wired vs. Wireless



This is best answered on EDUCAUSE's WIRELESS-LAN listserv, but something in my mind is saying that a certain wireless infrastructure vendor's WLAN gear doesn't like the contents of the DHCPOFFER, perhaps something about broadcast part?

 

Frank

 

From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf Of John Miller
Sent: Thursday, September 04, 2008 8:26 AM
To: dhcp-users at isc.org
Subject: Vista Issue - Wired vs. Wireless

 

I have a rather strange problem that I hope someone can help me with. This is a general DCHP issue as I am not sure what software the server is running.

 

We have several Vista clients that are not able to get an IP address when trying to connect wirelessly. They connect just fine when wired. The DHCP server is the same machine. I have done packet captures for both wired and wireless. I can see the DHCPREQUEST go to the server and I can see the DHCPOFFER come from the server. The server logs confirm the request and offer. In each case (wired and wireless) the DHCPOFFER looks identical. The only difference is that when wired the computer responds to the DHCPOFFER and does not respond when wireless. I have not seen any correlation with the brand of adapter, but that could be because we have not looked for one.

 

The only way we have found to resolve this issue is to do the Vista registry fix to turn off the broadcast flag in the DHCPREQUEST for the wireless adapter (KB 928233). While this will work, it means that any student who wants to connect to the wireless AND has Vista will need to bring their computer to our office to have the fix implemented.

 

Has anyone ever seen this issue and found another way to resolve it?

 

Thanks - John

 

-----

John H. Miller

Asst. Dir. of CNS for Telecom
Muskingum College

Computer & Network Services
163 Stormont Street
New Concord, Ohio  43762
Phone (740) 826-8052
Fax   (740) 826-8065

 

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