Douglas J Cameron wrote:
>
> Ahem..
>
> Forgive me for breaking into the topic here and possibly arriving from
> left field, but:
>
> Table 4.1 of "Internet Firewalls and Network Security" (Sijan/Hare, 1995)
> shows this:
> Port Number Description
> 23 Telnet
> 25 SMTP(mail)
>
> So, why would you not simply use the sepaerate port numbers for the
> seperate applications; and why would a firewall not know the difference
> between these ports?
> (Please forgive this newbie, O Great Firewall Wizards)
>
You are forgiven.
And I'm not even a wizard.
23 is where telnetd is expected to answer. 25 is where the SMTP daemon
is expected to answer. However, you can telnet to ANY PORT. For
instance, I used to fake all my mail from [EMAIL PROTECTED] by doing:
telnet ucbvax.berkeley.edu 25
Just because I thought that satan should live in a vax at berkeley.
HTH.
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
