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Date:      Sun, 22 Oct 2000 23:12:51 +0900
From:      JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp>
To:        "Gallagher, Mick" <mick.gallagher@roke.co.uk>
Cc:        freebsd-net@FreeBSD.ORG
Subject:   Re: GIF IPv6 tunnelling support
Message-ID:  <y7vsnpphsm4.wl@condor.isl.rdc.toshiba.co.jp>
In-Reply-To: In your message of "Thu, 19 Oct 2000 14:50:09 %2B0100" <76C92FBBFB58D411AE760090271ED41866E01A@RSYS002A>
References:  <76C92FBBFB58D411AE760090271ED41866E01A@RSYS002A>

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>>>>> On Thu, 19 Oct 2000 14:50:09 +0100, 
>>>>> "Gallagher, Mick" <mick.gallagher@roke.co.uk> said:

> The GIF man page suggests that the GIF tunnelling behaviour is based on RFC1933, which outlines transition mechanisms for IPv6 (basically v6 in v4 tunnelling).

> So far as v6-in-v6 and v4-in-v6 tunnelling is concerned, does GIF implement RFC2473 (Generic Packet Tunnelling in IPv6)?

RFC2473 contains many things, and some of them (e.g. Tunnel
Encapsulation Limit option) are not implemented in the GIF
stuff. Which part did you particularly mean?

> Also, does the GIF driver perform packet encapsulation itself, or does it pass inner packets through the stack for encapsulation in the outer packet?

> (I'm wondering about v6 extension headers in the outer packet).

The gif output routine(s) basically encapsulates the whole outer
packet by itself. But it does not attach any IPv6 extension headers.

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei@isl.rdc.toshiba.co.jp


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