[j-nsp] IPv6 questions

[snort bsd]

It does make sense though. Say one megabits interface with 20 VLANs. In that scenario, every VLAN, usually has own link-local address. It is more practical than "multiple interfaces with same link-local address."

I found this on Juniper router and now assume it is Juniper specific implementation.

Thanks all

----- Original Message ----
From: Scott Morris <swm at emanon.com>
To: Erik Nordmark <erik.nordmark at sun.com>; snort bsd <snortbsd at yahoo.com.au>
Cc: nanog at merit.edu; juniper-nsp <juniper-nsp at puck.nether.net>
Sent: Tuesday, 29 January, 2008 12:36:55 PM
Subject: RE: IPv6 questions


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 at merit.edu [mailto:owner-nanog at merit.edu] On Behalf Of
 Erik
Nordmark
Sent: Tuesday, January 29, 2008 1:44 PM
To: snort bsd
Cc: nanog at 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 at yahoo.com.au>
> To: nanog at merit.edu; juniper-nsp <juniper-nsp at 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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