I thought udp didn't need a route to the target host. As long as there is a connection to a hub the socket would send the data out. Don't a route to the target host mean tcp?
UDP is a transport protocol. Routing happens one step bellow at the network (i.e. IP) level. End-nodes (not routers) with single network connection have very simple routing tables and usually work off a default route/ default gateway in a way "I don't know where this packet needs to go so let the router I'm connected to figure this out". This is *not* the same as having an ethernet cable from your machine to a switch - some routing setup still needs to be done (either automatically via dhcp or manually.) Make yourself familiar with netstat, route, and traceroute commands, or, even better, pick up a copy of "TCP/IP Illustrated" Vol.1 by W. Richard Stevens (http://www.kohala.com/start/tcpipiv1.html) to get a better understanding of networking. Hope this helps. -- Nikolai