hello forget my previous problem, now i can get thoe following route
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.100.254 * 255.255.255.255 UH 0 0 0 ppp0 localnet * 255.255.254.0 U 0 0 0 eth0 default 192.168.100.254 0.0.0.0 UG 0 0 0 ppp0 but now i can not make ping to the machines in my lan, but i can make pings to machines that are outside the lan which could be the problem? thanks a lot