Re: [FW1] SMTP Telnet

[Robert Binder <rbinder@articon.de>]

hi larry,

thats not absolutly true. telnet uses shorter data packages. because of
that the raptor firewall for example is able to guess that there is a
telnet connection. On the other hand its only a guess.

hm

robert

On Tue, 9 Nov 1999, Larry Pingree wrote:

> Date: Tue, 9 Nov 1999 05:29:55 -0800
> From: Larry Pingree <lpingree@urs2.net>
> To: "Wat, Henry (HK-SGAP)" <henry.wat@Sema.com.hk>,
>     fw-1-mailinglist@lists.us.checkpoint.com
> Subject: Re: [FW1] SMTP Telnet
> 
> 
> 
>     The nature of TCP/IP does not allow this to be changed. There is no
> difference between the telnet client and another SMTP server connecting to
> port 25. Same goes for the Pop3.   There is no way can block it unless you
> stop allowing direct access to it.   Firewall-1 does provide an SMTP server
> to use as a relay agent, that relays SMTP request through the Firewall.
> 
> 
> 
> 
> --------------------------------------
> 
> lpingree@urs2.net
> Computer Security Specialist
> http://www.geek-guy.com <<---[ The Geek Hangout ]
> -------------------------------------
> If a packet hits a pocket on a socket on a port
> and the bus is interrupted as a very last resort
> and the address of the memory makes the data link abort
> then the socket packet pocket has an error to report.
> ----- Original Message -----
> From: Wat, Henry (HK-SGAP) <henry.wat@Sema.com.hk>
> To: <fw-1-mailinglist@lists.us.checkpoint.com>
> Sent: Tuesday, November 09, 1999 2:50 AM
> Subject: [FW1] SMTP Telnet
> 
> 
> >
> >
> > I was being ask by my manager, to see the possibility of blocking telnet
> > session (i.e. using a telnet software and specific port 25 or 110) into a
> > SMTP/POP3 server, any suggestion will be greatly appreciated.
> >
> > Regards
> >
> > HenryW
> >
> >
> >
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