netdev - Re: PROBLEM: MTU of ipsec tunnel drops continuously until traffic stops

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Message-ID: <20160721091256.GG3775@gauss.secunet.com>
Date:	Thu, 21 Jul 2016 11:12:56 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Matt Bennett <Matt.Bennett@...iedtelesis.co.nz>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: PROBLEM: MTU of ipsec tunnel drops continuously until traffic
 stops

Hi Matt,

I've did some vti tests the last days, but I was unable to
reproduce it.

On Tue, Jul 19, 2016 at 05:49:06AM +0000, Matt Bennett wrote:
> On 07/05/2016 03:55 PM, Matt Bennett wrote:
> > On 07/04/2016 11:12 PM, Steffen Klassert wrote:
> >> On Mon, Jul 04, 2016 at 03:52:50AM +0000, Matt Bennett wrote:
> >>> *Resending as plain text so the mailing list accepts it.. Sorry Steffen and Herbert*
> >>>
> >>> Hi,
> >>>
> >>> During long run testing of an ipsec tunnel over a PPP link it was found that occasionally traffic would stop flowing over the tunnel. Eventually the traffic would start again, however using the command "ip route flush cache" causes traffic to start flowing  again immediately.

Do you need the ppp link to reproduce it? How often does that happen?
It would be good to find a minimal setup with that the bug is reproducible.