Wired and wireless NICs on the same system

Does anybody have any suggestions for how to deal with laptops that
pick addresses from the DHCP server through both their wireless and
wired NIC?

The reason I'm asking is that I'm getting ready to deploy a wireless
access point at my office. Through this AP, users will be
authenticated by a RADIUS server that checks for a certificate
installed on the client. The entire process is automated through a
GPO. (basically, its the process outlined here:
http://go.microsoft.com/fwlink/?LinkId=23481)
Since GPOs are applied when the computer starts, or when the user logs
on, the wireless connection becomes live as soon as the computer
starts. This means the wireless nic picks up an address from DHCP
server. However, since the laptop is also plugged into the wired LAN,
the wired NIC also picks up an address from the DHCP server. This
leads to two problems:

1. The computer then ends up with two IP addresses
2. The number of addresses available in the DHCP scope runs out pretty
quickly.

Has anybody else run into this situation? How did you deal with it?

Thanks for the help.

you could bridge the connections if you're using XP. then you should
only get one IP address.
if you run into major performance degradation, see this tip:
http://tim.mackey.ie/PermaLink.aspx?...d-676e791c678d

tim

Hi Stuart,

I claim no mastery at all on the subject, but I hope this will help:

My Toshiba laptop has a program named "Network Device Switch". I had
downloaded this from Toshiba Support. This program checks the wired LAN port
continuously, and if it finds that a functional LAN cable is plugged,
disables the wireless port and connects to the wired LAN. Any time the cable
is removed or the wired LAN becomes non-functional, it switches to the
wireless automatically.
I hope that this program (or its equivalents, if available) should help yo
solve your problem.

Additionally, if you adjust the lease duration for a short period (hours?
minutes?), your problem of the DHCP scope being consumed too fast could be
overcome.

Regards,
Engin



"stuartk" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Does anybody have any suggestions for how to deal with laptops that
> pick addresses from the DHCP server through both their wireless and
> wired NIC?
>
> The reason I'm asking is that I'm getting ready to deploy a wireless
> access point at my office. Through this AP, users will be
> authenticated by a RADIUS server that checks for a certificate
> installed on the client. The entire process is automated through a
> GPO. (basically, its the process outlined here:
> http://go.microsoft.com/fwlink/?LinkId=23481)
> Since GPOs are applied when the computer starts, or when the user logs
> on, the wireless connection becomes live as soon as the computer
> starts. This means the wireless nic picks up an address from DHCP
> server. However, since the laptop is also plugged into the wired LAN,
> the wired NIC also picks up an address from the DHCP server. This
> leads to two problems:
>
> 1. The computer then ends up with two IP addresses
> 2. The number of addresses available in the DHCP scope runs out pretty
> quickly.
>
> Has anybody else run into this situation? How did you deal with it?
>
> Thanks for the help.
>

This all looks correct. One thing that might help is assigning a different
IP range to your wireless clients.

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"stuartk" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Does anybody have any suggestions for how to deal with laptops that
> pick addresses from the DHCP server through both their wireless and
> wired NIC?
>
> The reason I'm asking is that I'm getting ready to deploy a wireless
> access point at my office. Through this AP, users will be
> authenticated by a RADIUS server that checks for a certificate
> installed on the client. The entire process is automated through a
> GPO. (basically, its the process outlined here:
> http://go.microsoft.com/fwlink/?LinkId=23481)
> Since GPOs are applied when the computer starts, or when the user logs
> on, the wireless connection becomes live as soon as the computer
> starts. This means the wireless nic picks up an address from DHCP
> server. However, since the laptop is also plugged into the wired LAN,
> the wired NIC also picks up an address from the DHCP server. This
> leads to two problems:
>
> 1. The computer then ends up with two IP addresses
> 2. The number of addresses available in the DHCP scope runs out pretty
> quickly.
>
> Has anybody else run into this situation? How did you deal with it?
>
> Thanks for the help.
>