Re: [PATCH] xfrm:fragmented ipv4 tunnel packets in inner interface
From: Steffen Klassert <steffen.klassert@secunet.com>
Date: 2020-09-17 07:48:11
Also in:
linux-mediatek
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:quoted
On Tue, Sep 15, 2020 at 05:05:22PM +0800, lina.wang wrote:quoted
Yes, DF bit is not set....quoted
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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