Re: IPV6 Doubt

But you said it made sense... :)

Joe Astorino @ 07/06/2011 20:15 -0300 dixit:
> That is what it states in the document I posted. Check it out
>
>
> Sent from my Verizon Wireless BlackBerry
>
> Regards,
>
> Joe Astorino
> CCIE #24347
>
> "He not busy being born is busy dying" - Dylan
>
> -----Original Message-----
> From: Carlos G Mendioroz <tron_at_huapi.ba.ar>
> Date: Tue, 07 Jun 2011 20:06:52
> To: Joe Astorino<joeastorino1982_at_gmail.com>
> Cc: Routing Freak<routingfreak_at_gmail.com>; Cisco certification<ccielab_at_groupstudy.com>
> Subject: Re: IPV6 Doubt
>
> Joe,
> why do you think that PMTUD is only possible under TCP ?
> All it takes is sending oversized packets with DF, and waiting for
> someone to tell back "no go". Any IP packet can do that, or am I missing
> something ?
> -Carlos
>
> Joe Astorino @ 07/06/2011 12:29 -0300 dixit:
>> From reading this document it seems that path MTU discovery (PMTUD) is a way
>> for routers to determine the maximum IP MTU they can use along a path.
>> Seems it is only possible for TCP traffic according to the doc which makes
>> sense because if you send a TCP segment and it is higher than the outgoing
>> MTU at some point along the path, you should get an ICMP message back saying
>> so and be able to retransmit that segment. "ip tcp path-mtu-discovery"
>> seems to be the same basic concept but for router initiated traffic.
>>
>> Now, for IPv6 I believe that the PMTUD function is moved off of the routers
>> and on to the hosts but basically that is how I read things here.
>>
>> http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml#t4
>>
>> HTH
>>
>>
>> On Tue, Jun 7, 2011 at 11:04 AM, Routing Freak <routingfreak_at_gmail.com>wrote:
>>
>>> Hi fellows,
>>> I am searching for a command to enable path mtu discovery in IPV6.
>>> I want to know the difeerence between ip mtu discovery and ip tcp path mtu
>>> discovery
>>>
>>> Can some one point out the difference.
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net