Network ports - L33tdawg

Firstly, a little background information for those of you who don't have
a clue what ports are.

When
you're dealing with UNIX systems, or actually any computer connected to
the Internet or a large network, there are a large number of programs
running at once. When you telnet to a host, you're usually connecting
to the system via a TCP layer which is running on port 23. Most of the
time the program that is running is telnetd which just serves telnet connections.

Basically, what I shall be dealing with is just a short list of TCP ports
(there are several different ports available, but I shall mention the
most common ones seen). The purpose of listing these ports? Well just
to list the ports you'll need in order to obtain more information from
a server. Alright, with that out of the way, here are the ports :

1
tcpmux - TCP Multiplexer

7
echo - repeats whatever you type back to your terminal - loads of
fun on a bored Sunday afternoon.

9 discard - /dev/null it does nothing but absorb your input, so
don't even bother telnetting to it.

13
daytime - displays the systems date and time... of no real use!

15
netstat - find info about networking structure of remote host, however very few hosts I've scanned actually have this port running.

19 chargen - scrolls through a pattern of characters. I'm not really
sure what purpose the chargen port servers. Perhaps someone could furnish
me with some info.

21
ftp - File Transfer Protocol - Basically a port you can connect to
in order to download shit.

23
telnet - remote terminal connection (most of you should be familiar with this one, telnet is an excellent port to connect to first, as most
of the time, you'll be able to get valueable information for instance
the kernel version of a Linux server or just what version of UNIX the
system is running.

25
smtp - Simple Mail Transfer. Good when you want to fake e-mail!

43
whois - Whois server (duh!)

53
domain - Domain Name Service (DNS) Lookup

70
gopher - Outdated way to find infos on the net. This port is rarely
used on most of today's systems. However, I've found that a number of
.edu servers seem to run it.

79
finger - Find who is on remote system, although most hosts have closed
port 79. A really good tool if the server is running it. You can gather
a lot of important information regarding users with the use of the finger
command. Sadly, this port is usually closed - especially if the system administrator is really paranoid. I've found that quite a number of .edu
servers (did someone say monash.edu.au?) happens to run it.

80
http - Web Stuff (web browsers use this port to get HTML)

110
pop3 - Post Office Protocol - Incoming mail (if you've somehow managed
to get a username and password, you'd be able to check your victims mail.)

113
auth - authorization service

How
do i connect to these ports?

Since
all of the above mentioned ports are TCP ports, the best tool to use to
connect would be telnet. Assuming you're using a standard UNIX system,
typing "telnet somewhere.com" will tell the telnet client to
cnnect to default port of 23. If however you wish to connect to another
port other than the default just type the port number at the end of your
command. e.g. : telnet somewhere.com 25 (this would make the telnet program
connect to port 25, SMTP instead of port 23.)

I
don't really want to go into the "how do I get root with this lame ass
info" in here. If you are a true hacker (as in someone who is not malicious),
playing around with this information will enable you to learn more about
what makes a certain machine tick. If you've got a home network, an excellent
idea would be to install Linux on one of the systems, then use that machine
as a test host. You'll be able to learn a lot more from having a system
at your disposal. Besides, even if you do somehow manage fuck something
up, at least you won't have to worry bout the feds busting your door down.
I would also recommend users get a copy of a good port scanner. My personal
favourite is nmap, which has a lot of options (so you can learn more about
scanning and stuff) and is pretty easy to use. You can get your copy over
at http://www.insecure.org

Alright,
that's about all I have for you this time around... have fun, and don't
get caught! Peace.

1.)
My stoopid ass mind (part 1 - Beer, cigarettes & friends)
- Kikkoman

2.)
Network ports -
L33tdawg

3.)
My stoopid ass mind (part 2 - Work,
handphones & people) - Kikkoman

4.)
Black book of AFS -
nicnoc

5.)
How to fake e-mail -
L33tdawg

6.)
Hi! I'm dead and I'm an alien -
deadalien