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Note that any NAT that drops UDP packets altogether will basically disable DNS and VOIP type applications or at least degrade the experience in serious ways. I haven't come across many such NATs recently.

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Me neither. I have come across networks that filter everything but a few TCP ports (like 80 and 443), but that's a matter of draconian firewall policy rather than a NAT limitation.

I have come across networks that filter everything but a few TCP ports (like 80 and 443)

Another point scored for TCP in TCP with an SSL VPN. :-)

Only if your TCP VPN is listening on one of the allowed ports ;-)

(I do keep a TCP VPN running on port 443 ready to go for these situations, but UDP is always my first choice.)

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