Block Access On SMC Router

[JustinPMI]

I want to block access to the internet for a specific IP on the network. I basically know how to go about doing this. My only question is under setup in the options for the router I can specify the IP address to block. But it asks for the ports, how can I find out the ports this one computer is using?

[Mint]

Dont know if this will really help but i found it on microsofts webpage http://www.microsoft.com/windows2000/techinfo/reskit/samplechapters/cnfc/cnfc_por_zqyu.asp

This link provides you with the port number and what it will block or give access to, depending on how you are seting up your router

Cheers

[Surfer]

Port 80 is HTTP and that'll stop any browser activity. Port 21 is usually FTP, can vary from server to server. There's usually no need to block Telnet unless y'all have a particularly savy user. Telnet is Port 23.
Email send is 25 and receive is 109 and 110, usually 110.

Messaging software uses other ports as well as the ones above.
ICQ for example defaults to 5190 but i don't know what msn uses. yahoo defaults to port 80 for file transfer and 1611 and 1640 according to Netstat -a. Netstat -a should show all open and connected ports.

[JustinPMI]

That Nestat -a sounds very interesting, what exaclty is it, and where can I find more info on it?

[Spider]

Originally posted by JustinPMI
That Nestat -a sounds very interesting, what exaclty is it, and where can I find more info on it?
It reports on your computers connection activities.

Mostly it's used for examining your connections with the Web
but it also reports on the network (if you run one).

Open a MS-DOS Prompt and type
netstat ?

This will give you the different parameters for Netstat.
(parameters...fancy name for "letters to type" after netstat).