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