[vpn-help] No connect when configured for jumbo frames

Jim Harle vpn at technicolor.com
Mon Oct 28 13:34:39 CDT 2013


I have a ten-year-old laptop if you're interested, that baby is HUGE ;-)

From: vpn-help-bounces at lists.shrew.net [mailto:vpn-help-bounces at lists.shrew.net] On Behalf Of Paul Theodoropoulos
Sent: Monday, October 28, 2013 11:29 AM
To: vpn-help at lists.shrew.net
Subject: Re: [vpn-help] No connect when configured for jumbo frames

On 10/25/13, 11:18 AM, Thomas Stokkeland wrote:

If you are not doing SAN stuff, or very large file transfers within the collision domain - enabling Jumbo is likely to cause a crappier performance than leaving it at the standard 1500MTU - because, the router or receiving device will tell the sender to fragment, your packet will be split in half, this retransmit attempt will happen several times till the MTU is met - then as the "knowledge" of this expires your device will have to do that over and over.. causing a ton of extra traffic on your network.. so, if you don't have a requirement to use large MTU, then turn it off - i suspect there are mechanisms in the vpn software that either ignores large packets (because they are not to be routed) or just can't handle fragmentation at that level
That makes sense - thanks for the explanation. I suffer the "If an optional value is bigger, it must therefore be better/faster/more, so I need to use it" syndrome.



--

Paul Theodoropoulos

www.anastrophe.com<http://www.anastrophe.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.shrew.net/pipermail/vpn-help/attachments/20131028/f7daed2c/attachment.html>


More information about the vpn-help mailing list