IPv6 questions

Erik Nordmark erik.nordmark at sun.com
Tue Jan 29 18:43:45 UTC 2008


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
> 
> 
> 
> 
> 
> 
> 
> 
>       Make the switch to the world's best email. Get the new Yahoo!7
>  Mail now. www.yahoo7.com.au/worldsbestemail
> 
> 
> 
> 
> 
> 
> 
>       Make the switch to the world's best email. Get the new Yahoo!7 Mail now. www.yahoo7.com.au/worldsbestemail
> 
> 




More information about the NANOG mailing list