these are some details about my network. I'm trying to to share the internet with a linux machine. I can communicate with skypie but cannot surf the net and connot chat messengers. Network eth0 get dynamic ip address from the router(192.168.11.4) eth1 FC3 local dhcp server (IP:192.168.1.1 GW:eth0) "ifconfig"gives eth0 Link encap:Ethernet HWaddr 00:01:80:31:44:B9 inet addr:192.168.11.4 Bcast:192.168.11.255 Mask:255.255.255.0 inet6 addr: fe80::201:80ff:fe31:44b9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:45822 errors:0 dropped:0 overruns:0 frame:0 TX packets:39918 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:5477428 (5.2 MiB) TX bytes:4769221 (4.5 MiB) Interrupt:11 Base address:0xe400 eth1 Link encap:Ethernet HWaddr 00:90:99:33:4C:DF inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::290:99ff:fe33:4cdf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:45972 errors:0 dropped:0 overruns:0 frame:0 TX packets:38004 errors:0 dropped:0 overruns:0 carrier:0 collisions:18 txqueuelen:1000 RX bytes:5369348 (5.1 MiB) TX bytes:5827700 (5.5 MiB) Interrupt:10 Base address:0xdc00 I run iptables -t nat -A POSTROUTING -o eth0 -s 192.168.1.0/24 -j MASQUERADE I edited /etc/sysctl.conf setting net.ipv4.ip_forward = 1 and run "sysctl -p"(advices I saw on this mailing list) "iptables -L -n -t nat" shows this for the POSTROUTING: Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE all -- 192.168.1.0/24 0.0.0.0/0 "route -n" gives Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 0.0.0.0 192.168.11.1 0.0.0.0 UG 0 0 0 eth0 I can communicate with skypie so I think the internet sharing is OK but I cannot surf the net and cannot communicate with messengers Alexander,Remi and Christopher I need your help.