problrm on ipse site to site vpn

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Feb 18th, 2008
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hello there

i have a site to site ipsec vpn over internet for site A and site B . there is problem with SQL , Remote Desktop ...

the connection establish just for a second and after that i receive connection was broken !!!! on both remote desktop and SQL but i have stable ping all the time !

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Richard Burts Mon, 02/18/2008 - 08:29
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ehsan


Sometimes there is an issue with fragmentation when using IPSec VPNs. This is caused by the additional header information inserted by IPSec. It sounds as if this might be the issue with SQL and remote desktop (which frequently use maximum size packets) but not be an issue with ping (which usually does not use maximum size packdts). One way to deal with this issue is to use the ip tcp adjust-mss command. I would suggest that you configure under the LAN interface of the router ip tcp adjust-mss 1350. Give it a try and let us know if it helps.


HTH


Rick

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