How to have telnet client available on leap 15

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#1

Hello.
For testing purpose, I would like to have telnet client working on my new leap 15 install.
It seems that xinetd have been removed.

I have try

systemctl start telnet.socket

with no chance.

Searching for telnet on opensuse.org does not help.
So how to configure telnet client.

If telnet may be replaced by something else tell me.

Any help is welcome.

#2

It may help if you explain a bit more about “testing purposes”; in my
experience most people only want it for port tests, long ago made better
and faster and more-reliable with netcat or nmap, so I"ll cover netcat.

xinetd is not what you want if you want a client; that’s a server.

If you want to test ports you should use netcat:


netcat -zv google.com 443
#or somethings
nc -v google.com 443

If you want that to work when you call ‘telnet’ because netcat is not
familiar to you (yet), you could always setup an alias:


alias telnet='netcat -zv '
telnet google.com 443

–
Good luck.

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#3

Thank you very much.
I don’t need xinetd.
I just use it for telnet.

How can I test the following sequence without telnet :

telnet mailsrv.mydomain.com  587
> 220 mydomain ESMTP
< EHLO localhost
> 250-localhost
> 250-PIPELINING
> 250-SIZE
> 250-ETRN
> 250-AUTH PLAIN LOGIN
> 250-ENHANCEDSTATUSCODES
> 250-8BITMIME
> 250-DSN
> 250 SMTPUTF8
< MAIL FROM:some_user@mydomain.com
> 250 2.1.0 Ok
< rcpt to:another_user@another_domain.com
....................
..........

.
#4

Telnet is installed by default as part of the “Enhanced Base” pattern.

It is a normal client application, not a service. It is run by typing “telnet” at a shell prompt or in a script. Other options are explained in “man telnet”. I do not understand what you were trying to achieve with the bizarre systemctl commands.

If you have deleted or somehow failed to install telnet then:

sudo zypper install telnet
#5

It’s coming from a suse forum about a similarly question ( from my point of view). I think now it was relative to telnet server ( and not telnet client ).

After deleting telnet and reinstall it I can use it.

Thank you very much.

#6

Thank you every body for helping.

#7

On 07/23/2018 02:06 PM, jcdole wrote:
>
> Code:
> --------------------
> telnet mailsrv.mydomain.com 587
> --------------------

On my openSUSE box it is this:


netcat -C mailsrv.mydomain.com 587

The rest is the same, since that is just stuff you are typing as part of
the application layer (layer seven (7)) which is SMTP in this case and all
happening within the TCP (layer four (4)) connection. You may use ‘nc’
instead of ‘netcat’ depending on the version you have installed.

–
Good luck.

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show your appreciation and click on the star below.

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#8

Beware running a telnet server.

The telnet client is still very useful at times(you can probe any network service behind any port), but the server was deprecated many, many years ago due to its lack of built in security (everyone should use ssh instead if you want to run a server).

There probably is no acceptable reason to risk a system by running a telnet server, even for “testing.”

TSU

#9

Thank you very much.
:good:

#10

No. I have not installed the telnet server