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Groups > comp.os.linux.networking > #4839

Re: Forwarding a TCP connection

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On 2021-03-16, Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
>
> A proper managed switch works based on the connectors the traffic
> comes in or goes out, and on the Ethernet MAC addresses. The connectors
> are called ports in switch parlance, and they must not be confused with
> the TCP and UDP ports, which are software-defined mailboxes in protocol.
>
> The managed switches may group ports in groups called VLANs, virtual
> LANs. In principle, the ports in different VLANs do not connect to
> each other. However, a port may be designated a trunk port carrying
> the traffic of several VLANs at the same time. Even there the different
> VLANs are kept separate by a special identification tag in the Ethernet
> header.
>
> Some operating systems can handle tagged traffic. In Linux, the VLANs
> are seen as separate interfaces, marked with a dot and the VLAN number,
> e.g. eth0.3 for VLAN id 3 on eth0. The home routers seem to use this
> to provide several separate networks for external and internal nets,
> using only one Ethernet interface on the processor.
>
> There are bastard cross-overs between managed switches and routers,
> peeking into the IP traffic, but otherwise behaving like switches.
>
> A pure switch does not care about the payload protocols riding on
> the switched Ethernet.

Thank you for the excellent outline. I have been astounded at the 
rubbish being posted on the subject.

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Thread

Forwarding a TCP connection John Smith <12345@whatismyemailaddress.xyz> - 2021-03-14 20:07 +0000
  Re: Forwarding a TCP connection "Carlos E.R." <robin_listas@es.invalid> - 2021-03-14 22:41 +0100
    Re: Forwarding a TCP connection Richard Kettlewell <invalid@invalid.invalid> - 2021-03-14 22:02 +0000
      Re: Forwarding a TCP connection "Carlos E.R." <robin_listas@es.invalid> - 2021-03-14 23:26 +0100
        Re: Forwarding a TCP connection Richard Kettlewell <invalid@invalid.invalid> - 2021-03-14 22:46 +0000
      Re: Forwarding a TCP connection Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-03-15 09:42 +0100
  Re: Forwarding a TCP connection Jim Jackson <jj@franjam.org.uk> - 2021-03-14 22:03 +0000
  Re: Forwarding a TCP connection "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-03-14 17:40 -0400
    Re: Forwarding a TCP connection John Smith <12345@whatismyemailaddress.xyz> - 2021-03-14 23:23 +0000
    Re: Forwarding a TCP connection dyrmak <dyrmak@quelite.terre.invalid> - 2021-03-15 17:49 +0000
      Re: Forwarding a TCP connection Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-03-15 20:14 +0200
      Re: Forwarding a TCP connection "Carlos E.R." <robin_listas@es.invalid> - 2021-03-15 23:28 +0100
        Re: Forwarding a TCP connection Jorgen Grahn <grahn+nntp@snipabacken.se> - 2021-03-15 23:15 +0000
          Re: Forwarding a TCP connection dyrmak <dyrmak@orange.fr.invalid> - 2021-03-16 07:59 +0000
          Re: Forwarding a TCP connection Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-03-16 11:16 +0200
            Re: Forwarding a TCP connection Jim Jackson <jj@franjam.org.uk> - 2021-03-16 14:53 +0000
          Re: Forwarding a TCP connection "Carlos E.R." <robin_listas@es.invalid> - 2021-03-16 03:21 +0100
          Re: Forwarding a TCP connection Jim Jackson <jj@franjam.org.uk> - 2021-03-16 14:49 +0000
            Re: Forwarding a TCP connection Johann Beretta <beretta@nun-ya-bizness.com> - 2021-05-28 13:19 -0700
              Re: Forwarding a TCP connection Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-28 16:20 -0600
        Re: Forwarding a TCP connection Johann Beretta <beretta@nun-ya-bizness.com> - 2021-05-28 13:15 -0700
          Re: Forwarding a TCP connection Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-28 16:23 -0600
            Re: Forwarding a TCP connection Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-29 18:42 +0200
              Re: Forwarding a TCP connection Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-29 19:29 -0600
                Re: Forwarding a TCP connection Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-05-30 12:08 +0200
                Re: Forwarding a TCP connection Grant Taylor <gtaylor@tnetconsulting.net> - 2021-05-31 22:43 -0600
                Re: Forwarding a TCP connection Marc Haber <mh+usenetspam1118@zugschl.us> - 2021-06-01 08:51 +0200
    Re: Forwarding a TCP connection Johann Beretta <beretta@nun-ya-bizness.com> - 2021-03-24 19:30 -0700
      Re: Forwarding a TCP connection Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-03-25 16:35 +0200
        Re: Forwarding a TCP connection Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-03-25 20:03 +0100
          Re: Forwarding a TCP connection Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-03-25 21:34 +0200
            Re: Forwarding a TCP connection Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-03-25 21:54 +0100
            Re: Forwarding a TCP connection Johann Beretta <beretta@nun-ya-bizness.com> - 2021-03-29 13:45 -0700
        Re: Forwarding a TCP connection Johann Beretta <beretta@nun-ya-bizness.com> - 2021-03-29 13:43 -0700
          Re: Forwarding a TCP connection Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-03-30 20:26 +0300
            Re: Forwarding a TCP connection Johann Beretta <beretta@nun-ya-bizness.com> - 2021-03-30 22:49 -0700
              Re: Forwarding a TCP connection Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2021-03-31 16:29 +0000
  Re: Forwarding a TCP connection John Smith <12345@whatismyemailaddress.xyz> - 2021-03-14 23:13 +0000
    Re: Forwarding a TCP connection Jorgen Grahn <grahn+nntp@snipabacken.se> - 2021-03-15 06:59 +0000
    Re: Forwarding a TCP connection Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-03-15 09:48 +0100
      Re: Forwarding a TCP connection John Smith <12345@whatismyemailaddress.xyz> - 2021-03-15 13:44 +0000
        Re: Forwarding a TCP connection Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-03-15 20:49 +0100
          Re: Forwarding a TCP connection John Smith <12345@whatismyemailaddress.xyz> - 2021-03-15 21:10 +0000

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