Kerberos UDP to TCP reg switch?

I have a Domain Controller in another country that is connected to our Forest through a VPN Tunnel.

According to the Net guys their is lots of fragmentation due to going through multiple switches, TAC's exc.
I was told to change the Kerberos from UDP to TCP in the registry of our Domain Controllers

I understand basic concepts of UDP and TCP however, I don't know what unforseen issues Kerberos will have through the switch.

Can someone send me a link explaining the best practice for this change or at least a good site explaining how TCP/Kerberos works?
snyderkvAsked:
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snyderkvAuthor Commented:
A more important question is if we do end up needing this will I have to enable it via a GPolicy template on DC's only or all member servers? What if a DC does not have it will it still communicate?
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ChiefITCommented:
Well, what do you think of this article?
http://support.microsoft.com/kb/244474
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