Re: [v6ops] Some stats on IPv6 fragments and EH filtering on the Internet

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 05 November 2013 15:21 UTC

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Date: Wed, 06 Nov 2013 04:21:11 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Nick Hilliard <nick@inex.ie>
References: <5278275C.50206@gont.com.ar> <alpine.DEB.2.02.1311050028410.26054@uplift.swm.pp.se> <52783535.9030200@si6networks.com> <20131105001243.53E28985D0D@rock.dv.isc.org> <527839C6.3000805@viagenie.ca> <2134F8430051B64F815C691A62D98318148100@XCH-BLV-504.nw.nos.boeing.com> <F4AB804C-2C8E-40EF-ACE9-0A901E4F5122@employees.org> <52784DD1.7020106@gont.com.ar> <BD308F06-C9E2-42EB-9D23-CFD3432F1A1D@employees.org> <52785F34.6020606@si6networks.com> <A9F99218-AB14-45AA-B29D-7E1D7E4B93FC@employees.org> <5278E639.3040606@inex.ie> <C4864CA1-C8F4-45D6-944A-0E8BA073D4A7@employees.org> <5278E986.9050409@inex.ie> <C1BEE5D4-FDC2-4E4B-947D-CEC9E4F05E5D@employees.org> <5278EDAB.5030601@inex.ie>
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Cc: Fernando Gont <fgont@si6networks.com>, "v6ops@ietf.org" <v6ops@ietf.org>, Fernando Gont <fernando@gont.com.ar>
Subject: Re: [v6ops] Some stats on IPv6 fragments and EH filtering on the Internet
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On 06/11/2013 02:07, Nick Hilliard wrote:
> On 05/11/2013 12:54, Ole Troan wrote:
>> why don't you filter out packets on the edge destined to your router's addresses?
>> instead of what's effectively breaking IPv6 service across the network.
> 
> you can use infrastructure acls if they are handled carefully and don't
> depend on implicit "deny any any" (which has special handling for the
> "platform ipv6 acl fragment hardware").  But in order to implement this you
> need to protect every single link network connected to your PFC3s.  If your
> addressing plan is designed with this in mind, it's feasible.  If you have
> a very large network or if you've not handled your link address assignments
> very carefully, it's often not practical because it means dynamically
> maintaining huge access lists on every single device on the network.

I think Homer Simpson has a word for this situation.

We *really* aren't going to deprecate fragmentation because of one
model of broken kit, are we?

   Brian