Vista keeps name server options from previous lease

Simon Hobson dhcp1 at
Sat Sep 15 08:19:26 UTC 2007

Kirsten Petersen wrote:

>I realise this is probably not a ISC-DHCP issue, but if anyone has 
>seen this and can provide insight, I would appreciate it.

Well as it happens, it sounds very familiar ...

>Our residence halls have a range where they hand out leases to 
>unknown clients.  They also hand out a name server option different 
>from the campus ones.  This name server redirects all requests to a 
>registration page.  Once registered, the clients get a new lease, 
>with the usual name servers, and go along their merry way.
>We also have a wireless network in the residence halls.  What we are 
>seeing with Vista clients is this: the client picks up a lease from 
>the wireless network and gets the options for the main campus name 
>servers. Then, the user plugs into a wired port in the residence 
>hall and gets a new lease from the dhcp server on that network. 
>However, their name server option does not get updated.  Thus, they 
>don't get redirected to the registration page, because they are 
>talking to the wrong nameservers.
>So, what seems to be happening is that Vista is keeping the name 
>server options from a previous lease.  I haven't been able to find 
>anything in the archives pertaining to this issue with Vista.  Has 
>anyone else come across it?  Is it a Vista bug?

Can you post your config ?

Does it only happen with Vista ? Have you sniffed the DHCP packet 
contents to check that the right values are being sent ?

More information about the dhcp-users mailing list