Re: DHCP Client roaming issues

Tech Tip: Click here to run a free scan for Windows Errors and optimize PC performance

From: Phillip Windell (_at_.)
Date: 06/04/04 

Date: Fri, 4 Jun 2004 10:52:45 -0500

It won't get a new address until the least expires. I believe the default is
8 days unless you change it. Since the client checks with the DHCP Server
at 50% of the lease period, it won't get a new address for 4 days.

The problem is that you aren't supposed to unplug a machine and move it to a
different subnet without turning it off. So either turn it off or do a
"Release/Renew" after it is moved. 

-- 
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
"Erik Tamminga" <anonymous@discussions.microsoft.com> wrote in message
news:36BE61EF-F60A-4AD8-A7E8-761D9A98A2A5@microsoft.com...
> Hi,
>
> We've setup a new network with three vlans. The first vlan contains
> all of our servers, the second and third vlans contain our two
> different usergroups.
>
> When user A connects to the second vlan he gets an (correct)
> ip-address from our dhcp server in the server vlan. (our routers have
> setup ip helper-addresses).
> When user B connects to the third vlan he also gets an (correct)
> ip-address from our dhcp server in the server vlan.
>
> Now when user A moves his machine (without turning it off, just
> disconnecting and reconnecting the cable) from vlan two to vlan three,
> he doesn't get a new ip-address and continues to use the old address.
> We do not see the machine requesting a new address via the standard
> discover-offer-request-ack dhcp sequence.
>
> When user A releases his address prior to moving the machine
> everything works fine. Releasing the address once connected to the new
> network does NOT resolve the problem.
>
> Any hints on how to solve this?
>
> Regards,
>
> Erik
>

Relevant Pages

  • Re: Etablishing a enterprise solution for guest and employee access
    ... A trunk connection between the AP and a VLAN enabled Router/switch ... > Vlan_2 are distributed by a DHCP server in the WAN. ... > Peter Ullrich ... you can very simply set up two different remote access policies in IAS, ...
    (microsoft.public.internet.radius)
  • Re: DHCP Scopes
    ... Usually router forward DHCP request if DHCP server is located on different ... It requires a Router or a Layer3 Switch to work properly. ... With DHCP,...you simply create a normal, standard scope for the new ... I had one scope on the server and one VLAN on my network. ...
    (microsoft.public.windows.server.networking)
  • Re: need comments on proposed network archtecture-correct diagram this time
    ... >> You probably shouldn't have your packet filtering router do your VLAN ... >> You can allow the WWW server to gain access through the firewall to get ... >> You can put your servers on it's own VLAN, and have the DHCP server give ...
    (comp.security.firewalls)
  • Re: Multiple IPs on single NIC and multiple VLANs
    ... then it is possible for us to point these NIC to VLAN which you have ... are you using CISCO or MS dhcp server for VLAN configuration? ... you have to connect these 2 NIC cards to different subnet range / 2 ...
    (microsoft.public.win32.programmer.networks)
  • Re: DHCP Client roaming issues
    ... A "release/renew after it is moved" doesn't work. ... The renew process takes longer and the host presents it's old ip address. ... Since the client checks with the DHCP Server ... > ip-address from our dhcp server in the server vlan. ...
    (microsoft.public.windows.server.networking)