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Re: Connecting to an SSH server from the external world

From "D. Stussy" <spam@spam.org>
Newsgroups comp.os.linux.networking
Subject Re: Connecting to an SSH server from the external world
Date 2021-05-29 20:34 -0700
Message-ID <s8v14o$c2g$1@server.snarked.org> (permalink)
References <s8rnfh$qp2$1@gioia.aioe.org> <slrnsb3ql0.9a0.h_hucke+spam.news@romulus.aeon.icebear.cloud>

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One doesn't need to run a program to do port knocking if one has a stateful firewall.  For Linux and similar unices, iptables with a 
recent list (using a timeout) can be configured to work.

Note also that port knocking, although defined in terms of UDP, need not use UDP ports.  One can use other IP protocols, and in some 
circumstances, even some port-less protocols might work.

"Henning Hucke"  wrote in message news:slrnsb3ql0.9a0.h_hucke+spam.news@romulus.aeon.icebear.cloud...
On 2021-05-28, John Smith <12345@whatismyemailaddress.xyz> wrote:
Hi John (Yeah! "John" is certainly your name. Isn't it?).

> I have the following problem:

Ever heard about port knock client and server?

You would have to install a knockd on you server and use a knock client
on your laptop. This way you explicitly open your firewall for a short
period to establish a connection and then close it again.

Best regards.

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Thread

Connecting to an SSH server from the external world John Smith <12345@whatismyemailaddress.xyz> - 2021-05-28 21:31 +0000
  Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-05-28 22:28 +0000
    Re: Connecting to an SSH server from the external world John Smith <12345@whatismyemailaddress.xyz> - 2021-05-29 14:38 +0000
      Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-05-29 17:19 +0200
        Re: Connecting to an SSH server from the external world John Smith <12345@whatismyemailaddress.xyz> - 2021-05-29 16:27 +0000
      Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-05-29 15:27 +0000
        Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-29 19:46 -0600
      Re: Connecting to an SSH server from the external world Richard Kettlewell <invalid@invalid.invalid> - 2021-05-30 14:42 +0100
      Re: Connecting to an SSH server from the external world pk <pk@pk.invalid> - 2021-05-30 16:31 +0200
  Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-28 16:36 -0600
    Re: Connecting to an SSH server from the external world John Smith <12345@whatismyemailaddress.xyz> - 2021-05-29 14:42 +0000
      Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-29 18:44 +0200
      Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-29 19:37 -0600
  Re: Connecting to an SSH server from the external world Henning Hucke <h_hucke+spam.news@newsmail.aeon.icebear.org> - 2021-05-29 07:17 +0000
    Re: Connecting to an SSH server from the external world "D. Stussy" <spam@spam.org> - 2021-05-29 20:34 -0700
      Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-05-30 12:51 +0200
        Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-31 22:48 -0600
          Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-01 18:42 +0200
            Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-01 14:46 -0600
              Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-03 12:50 +0200
                Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-03 22:53 -0600
                Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-05 19:25 +0200
                Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-05 16:38 -0600
                Re: Connecting to an SSH server from the external world "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-06-05 18:58 -0400
                Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-12 11:16 +0200
                Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-12 11:12 -0600
                Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-13 13:55 +0200
                Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-13 10:40 -0600
                Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-14 16:29 +0200
                Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-14 11:32 -0600
                Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-06-13 17:55 +0000
                Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-06-14 16:34 +0200
                Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-06-14 11:39 -0600
                Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-06-14 21:03 +0000
                Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-06-14 22:26 +0000
      Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-31 22:45 -0600
  Re: Connecting to an SSH server from the external world Richard Kettlewell <invalid@invalid.invalid> - 2021-05-29 08:55 +0100
  Re: Connecting to an SSH server from the external world Giovanni <lsodgf0@home.net.it> - 2021-05-29 11:01 +0200
    Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-29 18:44 +0200
      Re: Connecting to an SSH server from the external world Giovanni <lsodgf0@home.net.it> - 2021-05-29 19:14 +0200
        Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-05-29 18:21 +0000
          Re: Connecting to an SSH server from the external world Roger Blake <rogblake@iname.invalid> - 2021-05-29 21:28 +0000
            Re: Connecting to an SSH server from the external world Johann Beretta <beretta@nun-ya-bizness.com> - 2021-05-29 22:03 -0700
              Re: Connecting to an SSH server from the external world Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-05-30 13:02 +0200
                Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-30 19:35 +0200
                Re: Connecting to an SSH server from the external world Johann Beretta <beretta@nun-ya-bizness.com> - 2021-08-11 11:48 -0700
          Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-29 19:41 -0600
            Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-05-30 14:43 +0000
              Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-31 10:22 +0200
                Re: Connecting to an SSH server from the external world William Unruh <unruh@invalid.ca> - 2021-05-31 17:29 +0000
          Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-30 12:12 +0200
        Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-30 12:11 +0200
      Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-29 19:48 -0600
        Re: Connecting to an SSH server from the external world Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-30 12:13 +0200
  Re: Connecting to an SSH server from the external world "Carlos E.R." <robin_listas@es.invalid> - 2021-05-29 20:56 +0200
    Re: Connecting to an SSH server from the external world Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-29 19:44 -0600

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