Re: [v6ops] about LLAs pros/cons static routing - auto/self-configuration of addresses, draft-matthews-v6ops-design-guidelines

On 09/08/2012 11:10, Mark ZZZ Smith wrote:
> Hi,
> 
> 
> ----- Original Message -----
>> From: Philip Matthews <philip_matthews@magma.ca>
>> To: Gert Doering <gert@space.net>; sthaug@nethelp.no
>> Cc: "v6ops@ietf.org list" <v6ops@ietf.org>
>> Sent: Thursday, 9 August 2012 7:26 AM
>> Subject: Re: [v6ops] about LLAs pros/cons static routing - auto/self-configuration of addresses, draft-matthews-v6ops-design-guidelines
>>
>> G ert and Stiener:
>>
>>
>> Thanks Gert for your comment about DNS. That is a new comment that I had not 
>> previously captured.
>>  
> 
> Depending on how visible you want your traceroute information to be one, one thing you could do would be use static link local addresses that are unique across the whole of your local network, and then put them in your local 0.8.e.f.ip6.arpa. subdomain.
> 
> For example, 
> 
> -----[fe80::1]<rtr1>[fe80::2]----[fe80::3]<rtr2>[fe80::4]-----[fe80::5]<rtr3][fe80::6]----
> 
> 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. PTR e0.rtr1
> 
> 2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. PTR e1.rtr1
> 
> 3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. PTR e0.rtr2
> 
> 4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. PTR e3.rtr2
> 
> 5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. PTR e2.rtr3
> 
> 6.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa. PTR e0.rtr3
> 
> 
> With so many interface IDs available in fe80::/64, there'd be no need to even put any effort into recycling them should you decommission a router or link. Just keep using the next fe80::X address as you add router interfaces.
> 
> Traceroute would work for you, 

It shouldn't, because intermediate routers should discard ICMPv6 packets with
LL source addresses, according to RFC 4291 section 2.5.6.

The fact that they don't is an implementation error, and we shouldn't
rely on that. ICMPv6 should never be sourced from a LL address.

    Brian

however outside of your network, other people would be querying their own version of 0.8.e.f.ip6.arpa., hiding your interface
and router names. This idea might be useful to assist with troubleshooting for a "Using Only Link-Local Addressing Inside an
IPv6 Network" http://tools.ietf.org/html/draft-behringer-lla-only-01 scenario.
> 
> Regards,
> Mark.
> _______________________________________________
> v6ops mailing list
> v6ops@ietf.org
> https://www.ietf.org/mailman/listinfo/v6ops
> 