Date: Thu, 27 Nov 1997 16:50:55 -0700 (MST) From: Charles Mott <cmott@srv.net> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@FreeBSD.ORG Subject: Re: a networking question... Message-ID: <Pine.BSF.3.96.971127164736.28870B-100000@darkstar.home> In-Reply-To: <199711272216.XAA09193@labinfo.iet.unipi.it>
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On Thu, 27 Nov 1997, Luigi Rizzo wrote: > I have the following problem with UDP: > > if I receive a packet with recvmsg, the identity of the sender is > returned in a sockaddr structure. However, I have no idea of the > destination address this packet was sent to. > > On a multihomed machine, this might be a problem even with unicast; > on a single-homed machine, this is a problem with multicast. > > Is there any way to be returned the destination address as well ? > > Cheers > Luigi I had a similar question which was kindly answered by a person named Alex (bag@sinbin.demos.su). He suggested that I use the recvmsg() call, and IP_RECVDSTADDR option enabled (man 4 ip). Another approach is to open a distinct socket for each address you are listening on and then using select() and FD_ISSET to see which socket and therefore which address the packet arrived at. Charles Mott
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