CUPS, Alpine, and printserving : telnet weirdness
Beartooth
Beartooth at swva.net
Sat Nov 1 20:21:29 UTC 2008
On Sun, 02 Nov 2008 05:34:19 +1030, Tim wrote:
[....]
> So, do not use telnet where you don't have to. But it's certainly a
> useful tool to try and connect to some server to see what it responds
> with. You can connect to a webserver, etc., using the telnet client,
> and what you do is no riskier than using a web browser. Just don't type
> confidential stuff when not encrypted.
[...]
> A telnet server listens on port 23, by default. And you could log in
> and have a remote shell through it. Without that server, you can't do
> *that*. But, you can use the telnet client to connect with other types
> of servers (mail, HTTP, etc.), and those servers will be the thing that
> responds. Some will be useable, some can't really be interacted with in
> a useful manner.
>
> If you telnet to port 631, it'll be the CUPS server that responds, if it
> can (CUPS has to be working, and allowing connections over the network
> that you're trying to access it).
[...]
> Telnet is little more than a remote terminal over a network.
I have just hit major weirdness. On machine #1, where I just
installed telnet an hour or so ago, and where it ran but failed to
connect, I've just tried again with a new target -- and suddenly bash
doesn't see telnet any more!
===== ===== ===== =====
[btth at Hbsk2 ~]$ telnet 192.168.a.b 631
Trying 192.168.a.b...
telnet: connect to address 192.168.a.b: No route to host
[btth at Hbsk2 ~]$ ssh 192.168.a.b
btth at 192.168.a.b's password:
Last login: Thu Oct 30 09:51:51 2008 from 192.168.a.q
[btth at Msgv ~]$ telnet 192.168.a.c 631
-bash: telnet: command not found
[btth at Msgv ~]$ telnet 192.168.a.c 631
-bash: telnet: command not found
[btth at Msgv ~]$ telnet 192.168.a.c 631
-bash: telnet: command not found
[btth at Msgv ~]$
===== ===== ===== =====
In between those, I ran rpm -q telnet on a different gnome-
terminal tab, and then "yum install telnet" again on a root tab. Both
assured me telnet was there.
--
Beartooth Staffwright, PhD, Neo-Redneck Linux Convert
Remember I know precious little of what I am talking about.
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