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?Hi, In using the Boost.Asio library, the Udp::Socket->send_to() function throws an error if the endpoint is unreachable. I thought in udp datagrams its a send and forget mentality. The send_to function would send the message even if the endpoint was unreachable. Is there a setting I need to use for this to work? RyanThis probably means you don't have a route to the target host, so your kernel returns with error from local TCP stack without actually putting packet on the wire. Hope this helps. -- Nikolai _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users