Re: [dhcwg] Question on Relay address field

Ted Lemon <mellon@nominum.com> Mon, 24 September 2001 20:19 UTC

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To: Vijay Bhaskar A K <vijayak@india.hp.com>
cc: dhcwg@ietf.org
Subject: Re: [dhcwg] Question on Relay address field
In-Reply-To: Message from Vijay Bhaskar A K <vijayak@india.hp.com> of "Tue, 25 Sep 2001 01:21:04 +0530." <200109241951.BAA09755@dce.india.hp.com>
Date: Mon, 24 Sep 2001 13:15:09 -0700
From: Ted Lemon <mellon@nominum.com>
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> Using the IPV6_PKTINFO  option in setsockopt(), we can find out ONLY the
> index of the  physical  interface.  We CANNOT  find out the exact  alias
> interface  in which it is  received.

Packets are not received by interface aliases - they are received by
interfaces.   There is no way that IPV6_PKTINFO *could* tell you on
which alias interface a packet was received, because interface aliases
are not hardware - they are merely a logical construct that is used to
hang more than one address onto a single physical interface.

So there is no way to make the determination you're talking about - a
packet arrives on an interface, and any kind of processing you want to
apply to it beyond that has to be done in your software.

			       _MelloN_

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