From owner-freebsd-net  Tue Apr 24  1: 2:31 2001
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To: raviprasad20@netscape.net
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In-reply-to: raviprasad20's message of Tue, 24 Apr 2001 03:51:24 -0400.
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Subject: Re: if_index ( index in the kernel datastructure) 
From: itojun@iijlab.net
Date: Tue, 24 Apr 2001 17:02:23 +0900
Message-ID: <17877.988099343@itojun.org>
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>this is with reference to the free BSD networking code for ipv6.
>Could any body tell why in link local addresses & other link local related things they are storing if_index in the second 16bits of the address. for eg there will be statement like
>ia->ia_addr.sa_addr.sin_add16[1] = ifp->if_index.
>Please tell me its significance & how it is useful & why u have chosen to use as such.

	http://orange.kame.net/dev/cvsweb.cgi/kame/IMPLEMENTATION
	(see section 1.3)

itojun

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