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Grex Internet Item 153: udp protocol
Entered by b0rgel on Sat Oct 21 20:08:08 UTC 2000:

Would somebody be nice enough to explain udp? And what is meant by a
"connectionless" protocol? Thanks in advance.

3 responses total.

#1 of 3 by dunne on Thu Nov 9 11:05:36 2000:

UDP, User Datagram Protocol, is an unreliable, connectionless datagram
protocol built on top of IP (Internet Protocol).  "Unreliable"
means that the protocol has no means of verifying that the data has
been received by the destination, and "connectionless" that control
or "handshaking" information is not exchanged between source and
destination.  So basically, the data is just sent on its way, and it's
up to higher levels to check for errors.  This gives UDP less overhead
than TCP, which is useful for some applications (DNS, for instance).

#2 of 3 by remmers on Thu Nov 9 17:39:23 2000:

I believe "talk" and "ping" also use UDP.

#3 of 3 by icecold on Tue Jan 11 00:13:11 2005:

talk use tcp. ping - another protocol - ICMP.

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