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Re: Multi-Networking in Linux - Multiple Subnets

Path csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From Robert Riches <spamtrap42@jacob21819.net>
Newsgroups comp.os.linux.misc
Subject Re: Multi-Networking in Linux - Multiple Subnets
Date 31 Jul 2026 04:06:43 GMT
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On 2026-07-31, c186282 <c186282@nnada.net> wrote:
> On 7/30/26 17:18, Lawrence D’Oliveiro wrote:
>> On Thu, 30 Jul 2026 13:58:28 +0200, Carlos E. R. wrote:
>> 
>>> The ISP configures the router so that it is mandatory to use
>>> 192.168.1.*, and they take a good chunk of it for their own usage. I
>>> have no recourse but using this non standard network.
>> 
>> I remember seeing one setup -- I think in the house of a friend of a
>> friend -- where there, not one, but *two* routers between the house
>> LAN and the Internet. The outer one specified one private LAN, while
>> the inner one put the house machines on an entirely different one.
>
>    TWO routers ? UUUGGGH !!! Sounds like
>    a world of trouble !

Sounds can be deceiving.  If the routers are arranged in series,
you get what is sometimes referred to as double-NAT.  You end up
with three levels of network:

- outer WAN with IP address provided by the ISP

- middle ground, LAN to the outer router and WAN to the inner
  router

- inner LAN

A host in the middle ground can access the rest of the middle
ground and the outer Internet.  The middle ground can be used for
less-trustworthy machines, like an employer's laptop or other
Windows machines.  It's somewhat like a DMZ.  If printers must be
accessed by the employer's laptop or other Windows machines, the
printer can go in the middle ground.

A host on the inner LAN can access the rest of the inner LAN, the
middle ground, and the outer Internet.  For an intruder to attack
a host on the inner LAN, the intruder needs to break through both
routers.

Zoom and a few other services don't play well with double NAT, so
Zoom and the like bad-mouth double NAT.  If I ever really need to
use Zoom, I'll use it from a Raspberry Pi in the middle ground.

-- 
Robert Riches
spamtrap42@jacob21819.net
(Yes, that is one of my email addresses.)

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Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-29 23:23 -0400
  Re: Multi-Networking in Linux - Multiple Subnets rbowman <bowman@montana.com> - 2026-07-30 04:14 +0000
    Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-30 23:38 -0400
      Re: Multi-Networking in Linux - Multiple Subnets rbowman <bowman@montana.com> - 2026-07-31 05:31 +0000
      Re: Multi-Networking in Linux - Multiple Subnets Richard Kettlewell <invalid@invalid.invalid> - 2026-07-31 09:44 +0100
        Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 12:19 +0100
  Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-30 12:37 +0200
    Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 13:42 +0200
      Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-30 13:58 +0200
        Re: Multi-Networking in Linux - Multiple Subnets Robert Heller <heller@deepsoft.com> - 2026-07-30 12:14 +0000
          Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:36 +0200
        Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-30 13:25 +0100
          Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:37 +0200
        Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 18:43 +0200
          Re: Multi-Networking in Linux - Multiple Subnets rbowman <bowman@montana.com> - 2026-07-30 19:22 +0000
            Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 21:53 +0200
              Re: Multi-Networking in Linux - Multiple Subnets rbowman <bowman@montana.com> - 2026-07-31 05:08 +0000
                Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-31 01:16 -0400
                Re: Multi-Networking in Linux - Multiple Subnets rbowman <bowman@montana.com> - 2026-07-31 08:00 +0000
            Re: Multi-Networking in Linux - Multiple Subnets Robert Heller <heller@deepsoft.com> - 2026-07-30 20:07 +0000
              Re: Multi-Networking in Linux - Multiple Subnets rbowman <bowman@montana.com> - 2026-07-31 05:14 +0000
          Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:38 +0200
            Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 12:46 +0100
              Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:57 +0200
            Re: Multi-Networking in Linux - Multiple Subnets - Movistar "docs" "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 14:25 +0200
        Re: Multi-Networking in Linux - Multiple Subnets Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-30 21:18 +0000
          Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-30 23:50 -0400
            Re: Multi-Networking in Linux - Multiple Subnets Robert Riches <spamtrap42@jacob21819.net> - 2026-07-31 04:06 +0000
              Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-31 00:34 -0400
                Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:50 +0200
                Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 14:51 +0200
                Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 14:37 +0100
          Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:43 +0200
            Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 12:50 +0100
              Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 14:00 +0200
            Re: Multi-Networking in Linux - Multiple Subnets Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-31 22:52 +0000
      Re: Multi-Networking in Linux - Multiple Subnets Robert Heller <heller@deepsoft.com> - 2026-07-30 11:59 +0000
        Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-30 13:32 +0100
        Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 18:44 +0200
          Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-30 18:06 +0100
            Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 21:54 +0200
        Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-30 23:48 -0400
        Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 08:15 +0200
          Re: Multi-Networking in Linux - Multiple Subnets Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-31 06:53 +0000
            Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 14:52 +0200
          Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 12:10 +0100
            Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 15:04 +0200
              Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 14:42 +0100
                Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 16:24 +0200
        Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 14:04 +0200
          Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 15:06 +0200
            Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 14:42 +0100
              Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 16:25 +0200
                Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 15:34 +0100
      Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-30 13:24 +0100
        Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 08:16 +0200
          Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-31 12:15 +0100
      Re: Multi-Networking in Linux - Multiple Subnets Andy Burns <usenet@andyburns.uk> - 2026-07-30 14:53 +0100
        Re: Multi-Networking in Linux - Multiple Subnets The Natural Philosopher <tnp@invalid.invalid> - 2026-07-30 14:59 +0100
          Re: Multi-Networking in Linux - Multiple Subnets Andy Burns <usenet@andyburns.uk> - 2026-07-30 15:06 +0100
            Re: Multi-Networking in Linux - Multiple Subnets Rich <rich@example.invalid> - 2026-07-30 14:35 +0000
        Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 18:46 +0200
      Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-30 23:45 -0400
      Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 13:51 +0200
        Re: Multi-Networking in Linux - Multiple Subnets "Stanislav N. aka pztrn" <no@email.please> - 2026-07-31 17:28 +0500
        Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-31 15:07 +0200
        Re: Multi-Networking in Linux - Multiple Subnets Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-31 22:55 +0000
    Re: Multi-Networking in Linux - Multiple Subnets c186282 <c186282@nnada.net> - 2026-07-30 23:43 -0400
      Re: Multi-Networking in Linux - Multiple Subnets "Carlos E. R." <robin_listas@es.invalid> - 2026-07-31 14:28 +0200
  Re: Multi-Networking in Linux - Multiple Subnets Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-07-30 13:48 +0200

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