Routing problems WiFi

Which service do I need to restart when I remove a WiFi card and reinsert it? I tried /etc/initd/network restart and /etc/initd/pcmcia restart but I still get network unreachable messages when hotplugging a wifi card. KWifimanager shows the signal strength is excellent and I seem to have a DHCP address (Wifi works fine if I reboot), but I get "network unreachable" error messages after removing and reinserting my WiFi card. Seems to just be a routing problem, but I'm not sure which service to restart. Thanks, Chas.