Connection to Router Lost After 1 Min

Hello,

This is the scenario:

– ADSL modem SpeedTouch 510 with built-in router and dhcp-server.
– Wireless access point D-Link DWL 2100AP. The dhcp server in the access point is turned off.
– D-Link Pc Card DWL-G650
– All firewalls are turned off everywhere.

1. I plug in the access point to the ADSL modem.
2. I plug in the Pc-Card.
3. The connection works fine incl the Internet and I can ping the ADSL modem.
4. After a min or so I cannot reach the ADSL modem (but the access point is reachable) and hence the Internet does not work. Ping doesn’t work either.

I have tried with another laptop (with the same PC-Card) as well a workstation with an PCI wireless network card from D-Link. The problem is exactly the same.

Help… Please…

/Marcus