> Yes, I mean DNS server. > > This bring another question, When network application want to > connect a host, how does it choice the interface? You can make the socket bind to a device, in which case the outgoing pkt will be routed with the device "hint". Otherwise, the Linux FIB (Forwarding Information Base) will choose a route for you-- the outgoing interface is a part of this route. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html