Fixed Lease DHCP Doesn't Work After Connecting Different Network

  • Thread starter Thread starter John Shwon
  • Start date Start date
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John Shwon

At my office the DHCP server leases me a specific IP address based on my MAC
address. I require this IP to use certain network services that are
restricted based on IP.

Everytime I use my laptop on another network and get leased an IP and then
return to the office I don't get my "fixed lease" IP based on MAC address.
The only way to get my assigned IP again is to assign myself a fixed IP and
then change back to DCHP. Somehow, these actions reset something so that I
get leased the correct IP again..

Why is this happening and who can I fix it without assigning myself a fixed
IP, applying and changing back to DHCP.

BTW - I'm not using wireless.

Thank!
 
At my office the DHCP server leases me a specific IP address based on my MAC
address. I require this IP to use certain network services that are
restricted based on IP.

Everytime I use my laptop on another network and get leased an IP and then
return to the office I don't get my "fixed lease" IP based on MAC address.
The only way to get my assigned IP again is to assign myself a fixed IP and
then change back to DCHP. Somehow, these actions reset something so that I
get leased the correct IP again..

Why is this happening and who can I fix it without assigning myself a fixed
IP, applying and changing back to DHCP.

BTW - I'm not using wireless.

Thank!
Click to expand...

The DHCP service(s) do not release the IP address once you disvconnect
from the network. In order for the DHCP "client" (your's) to re-
request an DHCP based IP address on next boot-up, you need to issue
the following at the Command Prompt:
 
John Shwon said:
At my office the DHCP server leases me a specific IP address based on
my MAC address. I require this IP to use certain network services
that are restricted based on IP.

Everytime I use my laptop on another network and get leased an IP and
then return to the office I don't get my "fixed lease" IP based on
MAC address. The only way to get my assigned IP again is to assign
myself a fixed IP and then change back to DCHP. Somehow, these
actions reset something so that I get leased the correct IP again..

Why is this happening and who can I fix it without assigning myself a
fixed IP, applying and changing back to DHCP.

BTW - I'm not using wireless.

Thank!
Click to expand...

This is normal but you're making life harder than you need to to fix it.
Either use ipconfig /release ....ipconfig /renew, or repair your connection
by right-clicking on it.
 
I tried ipconfig /release, and ipconfig /renew but I would not get the
correct IP assigned. I even tried "nuke-ing" my network stack using the
command on Scott Hanselmann's blog, but I still had the incorrect IP. The
only way that I found that works is speciying a fixed IP and then changing
back to DHCP.

Any idees?
 
John Shwon said:
I tried ipconfig /release, and ipconfig /renew but I would not get the
correct IP assigned.
Click to expand...

What do you see in ipconfig /all after you try this? What's the DHCP server
address? Shouldn't be the one on the network you aren't connected to!
I even tried "nuke-ing" my network stack using
the command on Scott Hanselmann's blog, but I still had the incorrect
IP. The only way that I found that works is speciying a fixed IP and
then changing back to DHCP.

Any idees?
Click to expand...

What about repairing the connection, as I suggested?

One way around this would be to do an ipconfig /release *before* shutting
down on 'the other network" ....then when you boot up in your office you
should getthe correct IP.
 
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