TCP/UDP Ports

eugene_mayo · #1 (**permalink**) 07-09-2002

Just wondering if anyone knows of any good on-line documentation on TCP/UDP Ports. Basically i want to know how to check if they are in use, learn how to close them, etc...
Thanks...

RTM · #2 (**permalink**) 07-09-2002

Try this link (Rutgers University) and do a search for lsof (either on your system or on Goggle ) - lsof is a program that lists open files (a port is a file in UNIX)

jas-jack · #3 (**permalink**) 07-19-2002

try this link for tcp/ip
information
http://www.cisco.com/univercd/cc/td/...er/scf4ap1.htm

tarballed · #4 (**permalink**) 08-01-2002

Here is my favorite link for TCP/UDP ports:

http://www.iana.org/assignments/port-numbers

Leigh Stone · #5 (**permalink**) 08-25-2002

Quickest way to see if a port is in use is to simply use the 'netstat' command and grep for the port you are interested in. Also note that port alias names can be configured in '/etc/services' thus if a port does not appear to be in use check if an alias exists and grep accordingly.

LivinFree · #6 (**permalink**) 08-26-2002

Many implimentations of netstat have the -n flag that causes netstat to not look up a common name in /etc/services.

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