Hi ns user, On wireless3.tcl (MobileIP), I saw two wired nodes connect to HA and FA as following: o W1 | o W2 / \ / \ o o HA FA o o MH --> If two wired nodes, W1 and W2 do not connect to HA and FA, can HA connect to FA by a wire? HA or FA is a router. How about W1 and W2? Router? Switch? ... Where's W1 go? Internet? Can you explain about wired domain of W1 and W2? Please help! Sun Cao