Hacker's Adda

However, if I log into an account on 10.0.0.3 and then telnet from
inside to port 25, here's what I get:
Last login: Fri Oct 18 13:56:58 2002 from 10.0.0.1
Have a lot of fun...
cmeinel@test-box:~> telnet localhost 25
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1... [Carolyn's note: 127.0.0.1 is the numerical
address meaning localhost, the same computer you are logged into]
Connected to localhost.
Escape character is '^]'.
220 test-box.local ESMTP Postfix
The reason I keep this port 25 hidden behind a firewall is to keep
people from using it to try to break in or to forge email. Now the
ubergeniuses reading this will start to make fun of me because no
Internet address that begins with 10. is reachable from the Internet.
However, sometimes I place this "test-box" computer online with a
static Internet address, meaning whenever it is on the Internet, it
always has the same numerical address. I'm not going to tell you what its Internet address is because I don't want anyone messing with it. I just want to mess with other people's computers with it, muhahaha. That's also why I always keep my Internet address from showing up in the headers of my emails.
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Newbie note: What is all this about headers? It's stuff at the
beginning of an email that may - or may not - tell you a lot about
where it came from and when. To see full headers, in Outlook click
view -> full headers. In Eudora, click the "Blah blah blah" icon.
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Posted in E-Book On Hacking XP