[wtarreau]

Loadbalancing UDP is trivial but totally useless without protocol awareness. Loadbalancing UDP properly is much less trivial because most UDP-based protocols need to be handled properly and rewritten since they carry IP addresses, ports, and even expect reverse connections (eg: tftp). In fact the only two UDP-based protocols that you can load-balance without doing anything are syslog and DNS. Both of them are useless as they are properly dealt with by the sender.