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Port forwarding on router: Selecting BOTH UDP and TCP?

When setting up port forwarding on a router, when in doubt, is it ok to select *both* UDP and TCP? Any harm?
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Top Expert 2015
Nope, no harm.

The difference is that UDP is a connectionless protocol... so just pumps data down the line and expects the recipient to deal with it, any bad bits and it doesn't care.

TCP established a connection first, then checks each packet is valid, and requests a resend if a bad packet is found.

Best practice for firewalls is least access, but it won't do any damage....


Thanks, very clear answer.