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Date:	Sun, 3 May 2015 12:01:09 -0700
From:	Martin KaFai Lau <>
To:	Hajime Tazaki <>
CC:	<>, <>,
	<>, <>,
	<>, <>,
Subject: Re: [PATCH net-next 3/5] ipv6: Stop /128 route from disappearing
 after pmtu update

Hi Hajime,

On Sun, May 03, 2015 at 11:29:55PM +0900, Hajime Tazaki wrote:
> the test uses two nodes (running on ns-3 network simulator
> with net-next kernel), which is connected via a
> point-to-point data link: payload is encapsulated by PPP
> (RFC1661).
> so there is no need of neighbor resolution (ARP, NS/NA) on
> that link (dev->flags has IFF_NOARP and IFF_POINTOPOINT bits).
>              point-to-point
>    node 0  <---------------> node 1
> 2001:1::1/64               2001:1::2/64
> let me know if you need further information.
Thanks for the details and confirming the last patch.  I think I may
know what could be wrong.  I am going to confirm it first by trying
to reproduce it.

> I'm going to create a real environment to figure out a
> minimum-reproducible command set that we can try.
That will be great!

> do you have any chance to create an interface with IFF_NOARP
> and IFF_POINTOPOINT (some tunnel device ?) on the latest
> net-next kernel ?
I am going to give it a try.

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