Comments on: MTU, Linksys, and Linux Connection failures http://www.kgadams.net/2005/12/30/mtu-linksys-and-linux-connection-failures Technology, computer games, MMOGs, science...and other nerdy stuff Fri, 21 Nov 2008 16:07:12 +0000 http://wordpress.org/?v=2.5 By: Kelly’s World- A View into the mind of Uber Geek, Kelly Adams » Blog Archive » My patience wears thin… http://www.kgadams.net/2005/12/30/mtu-linksys-and-linux-connection-failures#comment-17693 Kelly’s World- A View into the mind of Uber Geek, Kelly Adams » Blog Archive » My patience wears thin… Sat, 05 Apr 2008 06:25:32 +0000 http://www.kgadams.net/?p=222#comment-17693 [...] I found, shortly after I bought it, was that it did weird things with packet size. Specifically, I had to change the MTU size in order for several services to work through it. That was an esoteric enough problem that I [...] […] I found, shortly after I bought it, was that it did weird things with packet size. Specifically, I had to change the MTU size in order for several services to work through it. That was an esoteric enough problem that I […]

]]> By: anonymous http://www.kgadams.net/2005/12/30/mtu-linksys-and-linux-connection-failures#comment-17117 anonymous Sat, 01 Mar 2008 03:22:32 +0000 http://www.kgadams.net/?p=222#comment-17117 2008 version 2.0.18 firmware and it is still relevant. Was getting 400KB/sec downloads on a cable modem. Changed the automatic MTU to MANUAL 1500 and it jumped to over 1MB/sec. 2008 version 2.0.18 firmware and it is still relevant. Was getting 400KB/sec downloads on a cable modem. Changed the automatic MTU to MANUAL 1500 and it jumped to over 1MB/sec.

]]> By: Kelly Adams http://www.kgadams.net/2005/12/30/mtu-linksys-and-linux-connection-failures#comment-10386 Kelly Adams Sun, 03 Jun 2007 08:21:28 +0000 http://www.kgadams.net/?p=222#comment-10386 You are most welcome, Bob! Mind you, I'm a knowledge packrat- I don't throw away historical posts unless I have to :) You are most welcome, Bob! Mind you, I’m a knowledge packrat- I don’t throw away historical posts unless I have to :)

]]> By: Bob Hahn http://www.kgadams.net/2005/12/30/mtu-linksys-and-linux-connection-failures#comment-10384 Bob Hahn Sun, 03 Jun 2007 02:43:35 +0000 http://www.kgadams.net/?p=222#comment-10384 Thanks for leaving this around. A year and a half later, it's still relevant (unfortunately). Thanks for leaving this around. A year and a half later, it’s still relevant (unfortunately).

]]> By: Daren http://www.kgadams.net/2005/12/30/mtu-linksys-and-linux-connection-failures#comment-364 Daren Fri, 24 Feb 2006 20:34:59 +0000 http://www.kgadams.net/?p=222#comment-364 This is because Linksys has a bug in the way they monitor and calculate their MTU. The RV016 has a feature that allows you to assign up to 7 ports as WAN ports. This feature does not have an option to only have 1 WAN port (the minimum is 2) bcause of this, each packet is analysed when it hits the RV016 and the MTU monitoring function checks to see average MTU size and it's historical effect on latency. I assume you had the same issue we did. When you reset the router to factory settings did the first few SSH connections stay connected longer than the ones the followed? Ours did! This tells me that it is possible that the higher the percieved load, the worse the problem gets. By setting the MTU manually you caused the router to stop messing with the MTU. That is why SSH now works. Linksys will never admit to it but I am convinced they have an error in their Automatic MTU setting. Thanks for posting this, I am glad to know I am not the only one that had this issue. This is because Linksys has a bug in the way they monitor and calculate their MTU. The RV016 has a feature that allows you to assign up to
7 ports as WAN ports. This feature does not have an option to only have 1 WAN port (the minimum is 2) bcause of this, each packet is
analysed when it hits the RV016 and the MTU monitoring function checks to see average MTU size and it’s historical effect on latency.
I assume you had the same issue we did. When you reset the router to factory settings did the first few SSH connections stay connected longer
than the ones the followed? Ours did! This tells me that it is possible that the higher the percieved load, the worse the problem gets.

By setting the MTU manually you caused the router to stop messing with the MTU. That is why SSH now works. Linksys will never admit
to it but I am convinced they have an error in their Automatic MTU setting.

Thanks for posting this, I am glad to know I am not the only one that had this issue.

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