Since UDP is a connectionless protocol, I'm confused by the setting on my Sonicwall Firewall for "UDP Connection Timeout". It's set at a default of 30 seconds -- but what exactly times out after 30 seconds?
Here's my actual real-world situation: I have an NTP server in the ntp.org pool that serves about 3000 queries per minute. This puts a bit of a strain on my SOHO grade TZ-200 -- not in terms of bandwidth; but in terms of # of connections it has passing through it. I'm wondering if the UDP connections somehow are 'kept alive' on the SonicWall; even though they're (by definition) connectionless.
What am I missing here? What does SonicWall mean when it talks about a "UDP Connection Timeout"?