Anyone could explain this? Two linux systems connected: System A <=========> System B eth0 eth0 Each system ha the following config: # routing enabled net.ipv4.ip_forward=1 #ethernet with no address associated and NOARP set eth0 Link encap:Ethernet HWaddr 08:00:3E:26:24:65 UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:1306 errors:0 dropped:0 overruns:0 frame:0 TX packets:1325 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:732864 (715.6 KiB) TX bytes:61643 (60.1 KiB) Base address:0x3c00 # Routing table Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.10.10.10 * 255.255.255.255 UH 0 0 0 eth0 I'm on System A and try to ping 10.10.10.10 but no answer. Where is the problem? Bye, Antonio.