Subject: Re: Multicast recv IF

From: Bill Fenner <[email-masked]>
Date: Mon, 28 May 2001 12:38:38 -0700

There is no relationship between the join operations done on a socket and
the data that will be received on a socket.  The only way I'm aware of to
determine the incoming interface for a packet is the IP_RECVIF socket option.
I don't know how widely implemented it is.

  Bill