port number

Machine Access Control. Is it the actual address of the Network Card and supposedly no two are alike. You can think of a MAC Address as the land map used by governments to map property and your IP Address would be your Street Address.
A port is a connection thru which traffic is routed and depending on whihc type of data it is, a different port is used. You receive mail on Port 110 and send Mail on Port 25, as an example.

Why the question?

http://www.microsoft.com/windowsxp/using/networking/maintain/troubleshoot.mspx
http://www.microsoft.com/windowsxp/using/networking/setup/default.mspx
http://www.pcworld.com/video/id,368-page,1-bid,0/video.html
http://www.practicallynetworked.com/howto/
http://www.theeldergeek.com/quick_guide_to_simple_file_sharing.htm
http://www.microsoft.com/windowsxp/using/networking/default.mspx
http://www.ezlan.net/Wireless_Security.html

MAC Address: Start>Run>type "cmd" (no quotes) & at the prompt "ipconfig /all" (noo quotes and watch the spacing)

Who is tellin gyou that you need to define port numbers? Read the above links, especially #2.

This looks perfectly find for a DHCP connection from a router. why do you need to change anything?

The prots were setup whenyouinstalled Windows. Now if you woould quite beating around the bush and ask the $64k question maybe we can end this thread.
ZA blocks ports activity that it thinks is suspicious. 80, 8080, 25, 110, 21, 23 are the basic ones you use on a daiy basis (maybe not 21) but the firewall programs see activity and if a rule has not been deinfed ti allow that activity (i.e., traffic thru a port) you will get a notice asking to allow or deny.

Care to guess what is behnind "Door 666"?