vpn latency China to USA issue

having issues with users connecting via Microsoft VPN client from Shanghai China to our server here in the US, but only some users in that office.  there is severe latency while connected, but they can connect to the vpn. they did not have this issue until a week ago.  looking at setting up point to point vpn using Sonicwall TZ190 in our main office stateside and a TZ180 or whatever will work in China.  I would assume the vpn would be more stable (ok hoping is more accurate).
setup:  server 2003 R2 with Sonicwall TZ190 in main office in the US, users in China are on laptops (not on any domain/workgroup) and basic MS vpn setup.  users in the US are not having any issues with VPN.  
any advice would be appreciated, not sure what to look at with such a long distance and having them be 13 hours ahead time-wise.
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ajreed18Asked:
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
Possibly issue is that sometimes you need to change the MTU size from 1500 down to about 1350
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ajreed18Author Commented:
Thanks, I'll see how this works tonight if I can reboot the server.  
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ajreed18Author Commented:
this appears to have helped the connection quite a bit, thanks.  we are setting up a hardware vpn just to be safe but at least that office is connected again.
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
Your welcome glad to help ;)
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george82Commented:
Hi, I experience a similar issue, Win2003 R2 server Enterprise, MS VPN setup, users outside China have very high latency.

Excuse my ignorance , which MTU do we need to change?

Thanks
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
MTU could either be set on the client level or Hardware level.
MTU may need changing on the server also to match.
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george82Commented:
Changed the registry setting for mtu in the win2003 rras server, from 1500 to 1350, but how do I change the client's MTU though?

Thanks!
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