Re: CUPS, Alpine, and printserving : telnet weirdness
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@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@Hbsk2 ~]$ ssh 192.168.a.b
btth(a)192.168.a.b's password:
Last login: Thu Oct 30 09:51:51 2008 from 192.168.a.q
[btth@Msgv ~]$ telnet 192.168.a.c 631
-bash: telnet: command not found
[btth@Msgv ~]$ telnet 192.168.a.c 631
-bash: telnet: command not found
[btth@Msgv ~]$ telnet 192.168.a.c 631
-bash: telnet: command not found
[btth@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.