[ltp] IP address with wlan and eth

Gregor Rojec-Goldmann linux-thinkpad@linux-thinkpad.org
Wed, 08 Jan 2003 16:21:59 +0100


I have a T30 with wireless. I switch from cable to wireless and back 
several times a day. I would like to use the same IP address with eth0 
and wlan0 interface where only one is up at a time.

I use following scripts to start and stop wlan:


# start the wlan

ifdown eth0
ifconfig eth0 down

modprobe hostap_pci
ifup wlan0

# stop wlan
ifdown wlan0

ifconfig wlan0 down
rmmod hostap_pci

ifup eth0

If I use different IP adresses for the two network interfaces, it works 
fine. But if I use the same IP address it doesn't work, although only 
one is up at a time. After starting wlan0 I can't get eth0 back to work 

I can use the same IP adress for both interfaces with Windows XP.