yey!

..yeah..
netstat -an
......................... :s

-hyperx

um....

http://scan.sygatetech.com/

and

http://www.google.com/search?sourceid=navclient...=UTF-8&q=online+port+scan

hehehe...that's always easier. Or nmap/saint/satan if your a linux user...just thought I'd say. Netstat for me, is getting old, I like it when people reinvent the wheel. As has been done, in revolutions since long before even written glyphs.

On a related note: Anyone have a list of what programs use which ports? And which ports you don't want open? Also how to close them..

EDIT: I heard that port 5000 is a trojan port, and my computer is listening to it. What's it actually for?

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


Heh, now study the TCP/IP protocols on the ports you have questions about. No port is reserved for a trojan. A trojan may use a specific port but when the brain trust developed TCP/IP protocol suit they did not say lets reserve port XXXX for a trojan

commplex-main 5000/tcp
commplex-main 5000/udp


Looks like port 5000 can be used with TCP or UDP

RFC 739 TCP(TRANSMISSION CONTROL PROTOCOL)
ftp://ftp.rfc-editor.org/in-notes/rfc793.txt


RFC 768 UDP(User Datagram Protocol)
ftp://ftp.rfc-editor.org/in-notes/rfc768.txt

Think of TCP and UDP as similar but different protocols. Also study the OSI modle. Here is a basic TCP/IP protocol stack in relation to the OSI model

As you can see both UDP and TCP are on the transport layer of the OSI modle. This is because they are both used for transport. Read and understand what I just gave you and you will have better questions to ask.

If you want to learn to network security.. Study the TCP/IP prtocol stack. Everything you do in a network involves at least several protocols. Learn how the work. How networking in general works. What each layer of the OSI modle describes. How the TCP/IP modle stack is laid out *When authentication starts* Oh and here is where number systems come in handy...

in a nut shell; anything can run on any ports; just some are more common than others.

Spanky.. I'll look into that.
Gizmo: You make sense :p

I made perfect sense. Any program can open a port, the ports aren't assigned to anything, a program can run on any port it wants; just some ports have more common services running on it than others...

21 is known for FTP because most FTP clients run on it, hence 21 is most commonly used for FTP, however if you don't have an FTP server you can run a program on that same port and accept connections. With FTP servers also you can tell it to listen on any other port, even 25 which is for SMTP...

Just read it. TCP and UDP are the transport protocols for most everything you do on the net. Do you know what level/layer the authentication starts yet?