OpenWrt Forum Archive

Topic: mssfix problems

The content of this topic has been archived on 15 Nov 2014. There are no obvious gaps in this topic, but there may still be some posts missing at the end.

Post #1
fpbrat
21 Jun 2013, 18:57

Why do I see so many of those MSSFIX messages?


Router ModelTP-LINK TL-WDR3600/4300/4310 Firmware VersionOpenWrt Attitude Adjustment 12.09 / LuCI 0.11.1 Release (0.11.1) Kernel Version3.3.8



OpenWrt kern.warn kernel: [45010.000000] MSSFIX(wan):IN=eth0.2 OUT=br-lan
OpenWrt kern.warn kernel: [45016.130000] MSSFIX(wan):IN=eth0.2 OUT=br-lan
OpenWrt kern.warn kernel: [45028.980000] MSSFIX(wan):IN=eth0.2 OUT=br-lan
OpenWrt kern.warn kernel: [45029.000000] MSSFIX(wan):IN=br-lan OUT=eth0.2
OpenWrt kern.warn kernel: [45039.280000] MSSFIX(wan):IN=br-lan OUT=eth0.2
OpenWrt kern.warn kernel: [45040.840000] MSSFIX(wan):IN=eth0.2 OUT=br-lan

Regards
l

Post #2
fpbrat
21 Jun 2013, 19:17

I should also mention that I'm not running openvpn

Post #3
miroquai
20 Jan 2014, 15:17

I have a lot of the same kernel MSSFIX messages like yours... i started getting those when I turned on logging on WAN (eth0.2).

I use open wrt as a switch so maybe that is the reason, from your log i supose u have the similar configuration.

Anybody, idea?

Post #4
hjr84
20 Jan 2014, 17:42

I figured it out about a month or so after I posted the problem.

The cause was the feature called 'MSS clamping' being turned on.

http://en.wikipedia.org/wiki/Path_MTU_Discovery

Solution: I turned it off!!

The discussion might have continued from here.