Well, you need to create TCP connections to see the effect of PMTUD.. you could
build an iBGP session across the test network, and play around with the minimum
link MTU along the path. The MSS (shown in show bgp neighbor ..) should adapt
as you change it..
oli
> -----Original Message-----
> From: [email protected] [mailto:cisco-nsp-
> [email protected]] On Behalf Of Xu Hu
> Sent: 01 August 2012 02:33
> To: [email protected]
> Subject: [c-nsp] Fwd: IPV6 Path MTU DIscovery Test
>
> Anybody have any good idea?
>
> Thanks advance for any inputs,
> Xu Hu
>
> Begin forwarded message:
>
> > From: TJ <[email protected]>
> > Date: 1 August, 2012 5:23:46 GMT+08:00
> > To: Xu Hu <[email protected]>
> > Subject: Re: [c-nsp] IPV6 Path MTU DIscovery Test
> > Reply-To: [email protected]
> >
> > 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 <[email protected]> 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
> > _______________________________________________
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> >
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