UDP vs TCP traffic load?

I know there is some more overhead with using TCP over UDP but how much exactly? I ask because we are switching Kerberos requests from UDP to TCP on our Windows Server 2003 Domain Controllers and this came up because the traffic is going through a VPN tunnel that we suspect are fragmenting UDP traffic already (no proof)

Server 2008 already comes with this reg change switching UDP to TCP by dfeault. So I would assume increased traffic/fragmentation will have no affect.

What do you guy's/Gals think?
snyderkvAsked:
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th3w01fCommented:
The TCP header is 20Bytes and UDP is 8 bytes.  The error detection / congestion control aspects of TCP will most likely result in an increase in traffic but it should be negligible.  What size are the pipes and how many users are there?

Are you having problems with UDP fragmentation that are leading to the change to TCP?
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snyderkvAuthor Commented:
Well supposedly thats why the remote VPN users want us to do the change but they have yet to see any issues or event ID errors that would justify wasting even 10 seconds trying to make the change.

We don't know how many users are going through the VPN. It's only for replication traffic of DNS, AD and FSMO roles exc. 2000 users on each side of the VPN. Users authenticate locally though on each side. Two different sites.
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th3w01fCommented:
I'm with you; if there is no compelling reason to make the change I wouldn't do it.  If you have to make the change I doubt the additional overhead will have much of an impact unless your links are extremely small.
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