03-21-2013 10:30 AM - edited 03-04-2019 07:22 PM
So because of the way active directory handles Group Policy I have been tasked with finding out why this is failing over the WAN. Basically I know why, but don't know how to correct it. I am trying to increase the MTU over an ipsec tunnel to 2048 to allow Microsoft Slowlink detection to occur. http://support.microsoft.com/kb/227260 . Basically, it sends 2 icmp packets. One at a normal size and one at a size of 2048. In my case this is trying to occur over an ipsec tunnel and failing due to the MTU being at 1440. I have seen a few articles about increasing it to 1500, but is there a way to increase the MTU to allow the 2048 sized icmp packets?
03-21-2013 10:35 AM
No, there is no way.
You can't fit a size 9 foot in a size 6 shoe.
03-21-2013 10:45 AM
Is it not possible to just increase the MTU on the tunnel on both sides to 2048? I am getting the idea from this, that the maximum is 1500
http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml#NetPro
03-21-2013 10:53 AM
I have answered to you above already.
You can then do your experimenting, then report here the results.
03-21-2013 11:03 AM
thanks for clarifying /s
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