From: Steffen Klassert <steffen.klassert@secunet.com>
To: lina.wang <lina.wang@mediatek.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mediatek@lists.infradead.org,
Jakub Kicinski <kuba@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
"David S . Miller" <davem@davemloft.net>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] xfrm:fragmented ipv4 tunnel packets in inner interface
Date: Thu, 17 Sep 2020 09:46:37 +0200 [thread overview]
Message-ID: <20200917074637.GV20687@gauss3.secunet.de> (raw)
In-Reply-To: <1600172260.2494.2.camel@mbjsdccf07>
On Tue, Sep 15, 2020 at 08:17:40PM +0800, lina.wang wrote:
> We didnot get the router's log, which is some operator's.Actually, after
> we patched, there is no such issue. Sometimes,router will return
> packet-too-big, most of times nothing returned,dropped silently
This looks like a broken router, we can't fix that in the code.
> On Tue, 2020-09-15 at 11:32 +0200, Steffen Klassert wrote:
> > On Tue, Sep 15, 2020 at 05:05:22PM +0800, lina.wang wrote:
> > >
> > > Yes, DF bit is not set.
> >
> > ...
> >
> > > Those two packets are fragmented to one big udp packet, which payload is 1516B.
> > > After getting rid of tunnel header, it is also a udp packet, which payload is
> > > 1466 bytes.It didnot get any response for this packet.We guess it is dropped
> > > by router. Because if we reduced the length, it got response.
> >
> > If the DF bit is not set, the router should fragment the packet. If it
> > does not do so, it is misconfigured. Do you have access to that router?
>
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next prev parent reply other threads:[~2020-09-17 7:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200909062613.18604-1-lina.wang@mediatek.com>
2020-09-15 7:30 ` [PATCH] xfrm:fragmented ipv4 tunnel packets in inner interface Steffen Klassert
[not found] ` <1600160722.5295.15.camel@mbjsdccf07>
2020-09-15 9:32 ` Steffen Klassert
[not found] ` <1600172260.2494.2.camel@mbjsdccf07>
2020-09-17 7:46 ` Steffen Klassert [this message]
[not found] ` <1600341549.32639.5.camel@mbjsdccf07>
[not found] ` <1604547381.23648.14.camel@mbjsdccf07>
2020-11-05 4:41 ` Maciej Żenczykowski
2020-11-05 4:52 ` Lorenzo Colitti
2020-11-09 9:58 ` Steffen Klassert
2020-11-09 19:38 ` Maciej Żenczykowski
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