yes, I reseted the router.
now I'm using the 9.8.2.1 fw and the router is stable.
My home network:
toshiba satellite with Toshiba Wireless LAN Mini PCI Card 11b
Asus M6 with intel pro 2200b/g
toshiba satellite with Toshiba Wireless LAN Mini PCI Card 11b
2 pc with builtin lan connected by cable.
modem dlink dcm200
With the 1.8.1.9 fw the lan ports don't work with straight cable, don't know why.
for now my problem is solved.
thx all