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#1 2014-04-04 02:13:39

wshuman3
Member
Registered: 2013-08-26
Posts: 9

[Solved] Kernel 3.14: file transfers through VPN stall, 3.13.x Ok

Upgraded to Kernel 3.14 and started seeing file transfer stalls (scp, nc, etc) through AnyConnect/Juniper SSL VPNs.  Revertd back to Kernel 3.13.x and the behavior is gone.  Not sure where I should start looking to figure out the root cause.  I've tried reverting a couple of commits that had to do with MTU changes, but that made no difference.  Also tried disabling TCP automatic corking which also had no effect.

Any ideas where I should go next?

Last edited by wshuman3 (2014-04-15 13:47:20)

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#2 2014-04-10 12:32:14

wshuman3
Member
Registered: 2013-08-26
Posts: 9

Re: [Solved] Kernel 3.14: file transfers through VPN stall, 3.13.x Ok

Just thought I'd share an update if others are running in to this.

Seems like others are also having this issues
http://lists.infradead.org/pipermail/op … 01789.html

A discussion was started on kernel mailing list, but still not able to bisect and identify root cause
https://lkml.org/lkml/2014/4/2/317

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#3 2014-04-12 17:19:17

wshuman3
Member
Registered: 2013-08-26
Posts: 9

Re: [Solved] Kernel 3.14: file transfers through VPN stall, 3.13.x Ok

I finally bisected this, upstream bug submitted https://bugzilla.kernel.org/show_bug.cgi?id=73891

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#4 2014-04-15 13:47:04

wshuman3
Member
Registered: 2013-08-26
Posts: 9

Re: [Solved] Kernel 3.14: file transfers through VPN stall, 3.13.x Ok

patch here solved the problem, currently in net tree

http://www.spinics.net/lists/netdev/msg279297.html

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#5 2014-06-10 22:07:14

speculatrix
Member
Registered: 2014-06-10
Posts: 2

Re: [Solved] Kernel 3.14: file transfers through VPN stall, 3.13.x Ok

I just had to spend a few hours and finally traced it to my firewall. I recently rebuilt my firewall/router with a very new motherboard* and my initial install was running 3.11, so I thought I would use a newer kernel and installed 3.14.4

everything seemed fine for a while, but then my wife began complaining about problems uploading images to facebook and other problems with email. I thought it was MTU causing large packets to be dropped, but after quite some time, I proved it wasn't that, as I could use winscp files and it would get so far and stall, typically tens of KB.

getting increasingly frustrated, I rebooted my linux firewall, didn't help, so booted the old kernel and voila, large internet transfer uploads worked again!!



* gigabyte ga-j1900-d3v, a baytrail chip-on-board motherboard.

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