From: Tanaka Akira <akr@...>
Date: 2009-02-08T02:15:32+09:00
Subject: Re: How do I get the destination IP of a received UDP packet?

In article <b00c5d794604ec7567bd09a421cab21b@ruby-forum.com>,
  Gavin Yap <maclaren_sg@yahoo.com.sg> writes:

> I guess this is the only way get my destination address.
> I wonder if there's a way to recieve the packet, with layer 3(IP header) 
> and layer 4(UDP header) info.

Your OS may have another (non-portable) way.

For example, IP_PKTINFO of GNU/Linux, IP_RECVDSTADDR of 4.4BSD.

However they needs recvmsg which is not supported by Ruby, yet.
-- 
Tanaka Akira