[102143] in North American Network Operators' Group
RE: IPv6 questions
daemon@ATHENA.MIT.EDU (Scott Morris)
Tue Jan 29 14:38:14 2008
Reply-To: <swm@emanon.com>
From: "Scott Morris" <swm@emanon.com>
To: "'Erik Nordmark'" <erik.nordmark@sun.com>,
"'snort bsd'" <snortbsd@yahoo.com.au>
Cc: <nanog@merit.edu>, "'juniper-nsp'" <juniper-nsp@puck.nether.net>
Date: Tue, 29 Jan 2008 14:36:55 -0500
In-Reply-To: <479F73E1.2060903@sun.com>
Errors-To: owner-nanog@merit.edu
And unless you are on only certain particular devices (e.g. L3 switches)
then the end device won't necessarily have any relevant clue what VLAN it's
on.
I have never seen/heard of an RFC for it either and would certainly wonder
"WHY?". :)
Scott
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Erik
Nordmark
Sent: Tuesday, January 29, 2008 1:44 PM
To: snort bsd
Cc: nanog@merit.edu; juniper-nsp
Subject: Re: IPv6 questions
snort bsd wrote:
> Never mind
>
> it is the VLAN number. But which RFC define this?
I've never seen an IPv6 RFC specify to put the VLAN number in the link-local
address.
Thus this must be an (odd) choice made by some implementation. Perhaps the
implementation somehow requires that all the link-local addresses for all
its (sub)interfaces be unique, even though the RFCs assume that the
implementation should be able to deal with multiple interfaces with same
same link-local address.
Erik
> Thanks all
>
> Dave
>
> ----- Original Message ----
> From: snort bsd <snortbsd@yahoo.com.au>
> To: nanog@merit.edu; juniper-nsp <juniper-nsp@puck.nether.net>
> Sent: Monday, 28 January, 2008 3:05:59 PM
> Subject: IPv6 questions
>
>
> Hi All:
>
> With link-local IPv6 address, the converting from MAC-48 to EDU-64
> address format (FF FE stuffing). How does the VLAN tags affect the
> conversion?
>
> With the rule of FF FE stuffing, I can see clearly work on the ptp
> interfaces. But on those Ethernet based VLANs, it doesn't seem to
> follow that pattern:
>
> Current address: 00:90:69:4a:b9:5d, Hardware address:
> 00:90:69:4a:b9:5d
>
> well, i assume the link-local should be fe80::290:69ff:fe4a:b95d/64.
> actually, it shows:
>
> Destination: fe80::/64, Local: fe80::290:6903:94a:b95d
>
> how does the router get this 03 09 instead of ff fe?
>
> Thanks all
>
>
>
>
>
>
>
>
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