Protocol Analysis
Since most servers perform a routine task and need to interoperate with random clients and other servers, most servers are based on some sort of standard protocol. The Internet Engineering Task Force (IETF) maintains the set of protocols that form the Internet as we know it. So the best way to find out how a server, for example, a LPR server, operates is to look up the Request for Comments (RFC) document for the LPR protocol, which can be found on www.ietf.org as RFC 1179.
Here is an excerpt from the RFC 1179 (see reference: www.ietf.org/rfc/rfc1179.txt):
"3.1 Message formats LPR is a a TCP-based protocol. The port on which a line printer daemon listens is 515. The source port must be in the range 721 to 731, inclusive. A line ...
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