[c-nsp] Fwd: IPV6 Path MTU DIscovery Test

[Xu Hu]

Anybody have any good idea?

Thanks advance for any inputs,
Xu Hu

Begin forwarded message:

> From: TJ <trejrco at gmail.com>
> Date: 1 August, 2012 5:23:46 GMT+08:00
> To: Xu Hu <jstuxuhu0816 at gmail.com>
> Subject: Re: [c-nsp] IPV6 Path MTU DIscovery Test
> Reply-To: trejrco at gmail.com
> 
> In order to test it, take one of the links along the path and change the (IPv6) MTU to something smaller - say 1300B.  Then send large packets, with WireShark running.  And no, you cannot disable PMTUD in IPv6.
> 
> HTH!
> /TJ
> 
> 
> On Tue, Jul 31, 2012 at 6:43 AM, Xu Hu <jstuxuhu0816 at gmail.com> wrote:
> Hi Experts,
> 
> I have some queries about the PMTU for IPv6.
> 1. From my understanding, path MTU discovery in IPv6 allows a host to
> dynamically discover and adjust to differences in the MTU size of every
> link along a given data path, So the fragmentation is handled by the
> source, if i want to test this feature in the IPv6 network, anyone have any
> good ideas?
> For example, as below topology, if i want to test the Path MTU discovery,
> how to test, i can ping from CE-1  to CE--2 with a specific IPv6 packet
> size.
> CE-1------PE-1------------PE-2--------CE-2
> 
> 2. If i need to configure the Path MTU discovery, just one command
> mentioned in Cisco.com, which is "ipv6 flowset" under configuration mode.
> So if i want to disable that in test scenario, just using the "no ipv6
> flowset" is okay? Cisco don't mentioned that.
> By default, it is enable for ip routers or not?
> 
> Thanks for any inputs.
> 
> Best Regards,
> Hu Xu
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>