Re: [ts-7000] telnet from a different network blocked ?

[Per Öberg <>]

Hi there are two ways of starting the telnetd daemon and the this
differs between the TS-debian or TS-busybox distros.

Either telnetd is started directly using the /etc/init.d/telnetd script
 as in my ts-7250's busybox distro or it is started using a tcpd wrapper
as in my ts-7250's debian distro (which i realize is misconfigured at
the moment but I'm always using ssh anyway).

The telnetd option may be configured using parameters to in the telnetd
script (I don't know the defaults) and maybe by some config file but I
am unsure. The tcpd wrapper may be configured using the /etc/hosts.allow
and /etc/hosts.deny, there might be other files of importance, use "man
tcpd" and look for config files.

Do you know how telnetd is started? Is it started using a tcpd wrapper
or is it started directly? You may check /etc/inetd.conf for a
uncommented telnet line. If this line looks like
"telnet stream  tcp  nowait telnetd.telnetd /usr/sbin/tcpd
/usr/sbin/in.telnetd" you have the tcpd wrapper. If you have a
/etc/rc.d/rcx.d/SYYtelnetd link (x is your runlevel YY is a ordering
number for the startup) you are using the direct option.

Hope this helps
Regards
Per Öberg

Dave Cramer wrote:
> Let me explain.
>
> from computes on the same class C I can connect, from computers on a
> different class C I can't connect.
>
> telnetd is listening on port 23
>
> what I want to know is does telnetd block connections from a different
> network ?
>
> Dave
> On 17-Apr-07, at 7:06 PM, Alvaro Aguirre wrote:
>
>> Ok, do you have any aplication *listening* on the 23 port?
>> If not, you can use the tcputils utilities (tcplisten in this case)
>>
>> On 17 Apr 2007 13:40:57 -0700, *Dave Cramer* <
>> <>> wrote:
>>
>>     Yes, there is a gateway, however only certain ports are blocked.
>>
>>
>>     Dave
>>     On 17-Apr-07, at 4:13 PM, Alvaro Aguirre wrote:
>>
>>>     Do you have a gateway betwen the two networks?
>>>
>>>     On 17 Apr 2007 12:3 5:48 -0700, *Dave Cramer* < 
>>>     assets.com <>> wrote:
>>>
>>>         Is there some code in the telnetd which blocks connections
>>>         from a
>>>         different network ?
>>>
>>>         I am using openvpn
>>>
>>>         I want all my "real" computers to be on 172.16.73.0/
>>>         <http://172.16.73.0/>24, and all my
>>>         7250's to be on 172.16.72.0/ <http://172.16.72.0/> 24
>>>
>>>         wierdly enough I can't connect to port 23 from the real
>>>         computers to
>>>         the 7250 ??
>>>
>>>         But I can connect to other ports, so the network is fine.
>>>
>>>         Anyone ?
>>>
>>>         Dave
>>>
>>>
>>>
>>
>>
>>
>>
>
>

--
Per Öberg, Ph.D. Student
Address: Division of Vehicular Systems
Department of Electrical Engineering
Linköpings universitet
581 83 Linköping, SWEDEN
Phone: +46 (0)13-28 23 69
e-mail: 



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