TCP/UDP Ports 1

[ElijahBaley]

Hi

I would like to learn a bit more about ports and the activity going on, what commands (freeware utilities?) are available to help me get to grips with this?

Thanks for any help,

EB

 

[pansophic]

I highly recommend ethereal. It is a sniffer application based on libpcap and provides an excellent method of learning how connections are actually negotiated, used and terminated.

http://www.ethereal.com/

pansophic

 

[ElijahBaley]

Thanks, I will look at that

EB

 

[kb3cgj]

If you have a linux box around, tcpdump is a great little utility. I even heard mention of a windows version.

Nick Mitchell
Network Engineer
Delaware.Net

 

[ElijahBaley]

Ok Nick

Thanks

 

[Xemus]

Active Ports is a quick and easy program for just watching connections. Not a packet sniffer, but if you want to know what your computer is connecting to and what service is running on what port, I recommend it.

http://www.protect-me.com/freeware.html

MCSE, A+

 

[digitalmaster]

To test your protection try

http://www.grc.com

 

[Xemus]

GRC is great for a very simple common ports check, but it only tests about .1% of the total ports that are availabe on your computer. If you are really serious about looking at the activity going on, check into Snort or NMAP. MCSE, A+