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

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Thu, 09 August 2012 21:07 UTC

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Date: Thu, 09 Aug 2012 14:07:00 -0700
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Cc: "v6ops@ietf.org list" <v6ops@ietf.org>, "mbehring@cisco.com" <mbehring@cisco.com>, Philip Matthews <philip_matthews@magma.ca>
Subject: Re: [v6ops] about LLAs pros/cons static routing - auto/self-configuration of addresses, draft-matthews-v6ops-design-guidelines
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Hi Brian,


----- Original Message -----
> From: Brian E Carpenter <brian.e.carpenter@gmail.com>
> To: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
> Cc: Philip Matthews <philip_matthews@magma.ca>; Gert Doering <gert@space.net>; "sthaug@nethelp.no" <sthaug@nethelp.no>; "mbehring@cisco.com" <mbehring@cisco.com>; "evyncke@cisco.com" <evyncke@cisco.com>; "v6ops@ietf.org list" <v6ops@ietf.org>
> Sent: Thursday, 9 August 2012 8:47 PM
> Subject: 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:
>>> 
>>> 

<snip> 

>>  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.
> 

Hmm, you're right.

So this idea would provide accurate reverse DNS names for your static link local addresses because they're now unique within your network, however the collection of that information can't rely on link local addressing as it would in traceroute, if the collection process needs to traverse more than a single link.

Regards,
Mark.

> 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
>> 
>

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