how to stop using *telnet <domain> 25*

[Bruce Marshall]

On Saturday 24 January 2004 12:29 pm, Ben Duncan wrote:
> I think the question here is :
>
> Someone outside our network/domain is using a telnet to
> port 25 to use the MTA.
>
> Anyone more familiar with iptables know if such a "service"
> can be blocked ?
>

Assuming you need to have port 25 open to the outside world, then I think 
you're left with blocking that IP address.   Yes, iptables can block the 
address.  I do it all the time with shorewall.



> Bruce Marshall wrote:
> > On Saturday 24 January 2004 10:57 am, Swapana Ghosh wrote:
> >>I  have already blocked that IP. But the question is they can use another
> >>IP, which they did before already once IP with different net work. So how
> >>many IPs we will block? That is why i was wondering , if there is a way
> >>then we can stop our tension for ever..
> >
> > I was going to say  "get rid of the telnet client"  since no one really
> > should be using it for anything...  but...   a) There might be a need for
> > it, or b) he might already have a copy of the client (or could easily get
> > one).
> >
> > Is there any clue as to who it is?   In the mail sent?

-- 
+----------------------------------------------------------------------------+
+ Bruce S. Marshall  bmarsh at bmarsh.com  Bellaire, MI         01/24/04 12:43  +
+----------------------------------------------------------------------------+
"If marriage were outlawed, only outlaws would have in-laws."