On 6/10/13 7:01 AM, Andrew McGregor wrote:
Which is definitely not true in general. Some do that, many do not
inspect beyond 128, some go further.
The lower bound is probably 53. There's a lowest common denominator
problem if you expect to be able to find an l4 header as part of your
forwarding decision
On Mon, Jun 10, 2013 at 8:09 AM, Arturo Servin
<arturo.ser...@gmail.com <mailto:arturo.ser...@gmail.com>> wrote:
There is another conversation in v6ops that mentioned that
switching
ASICs do not inspect beyond 40 bytes.
That was never said. You should reread the thread. What was said is that
the fixed portion of the ipv6 header is 40 bytes, which is all you need
to forward on modula hop-by-hop options. unless you need to find the l4
header for some reason in which case you're back to here:
http://tools.ietf.org/html/draft-wkumari-long-headers-00
-as
On 6/9/13 10:46 AM, Fernando Gont wrote:
> Ray,
>
> On 06/08/2013 01:06 PM, Ray Hunter wrote:
>> I was thinking something along the lines of:
>>
>> - The preferred length of a Hop by Hop extension header for
optimized
>> forwarding in hardware is always 16 octets long.
>>
>> - the Hop by Hop EH may be present exactly once, or not
present, and is
>> always transmitted directly after the IPv6 header (already the
case in 2460)
>
> I'd say one should enforce a "each EH can be present at most once".
>
> ANd, me, I'd limit the EH chain to 1280 octets (at most) -- even
that is
> kind of irrational: 1280 is the IPv6 minimum MTU... so we'd be
allowing
> packets that are 100& overhead.
>
> Cheers,
>
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