Re: Linux machine hit by ransomware
On Thu, 10 Jul 2025 06:57:10 -0400
Greg Wooledge <greg@wooledge.org> wrote:
> On Wed, Jul 09, 2025 at 23:23:29 -0700, David Christensen wrote:
> > On 7/9/25 22:14, Rick Macdonald wrote:
> > > In 30 years I've never seen an isolated network. May I ask how
> > > this might be done?
> >
> > Assuming an Internet gateway with 4 LAN ports and Wi-Fi, and a
> > server with 1 LAN port, turn off everything except the gateway,
> > connect the server LAN port to a gateway a LAN port (via switches,
> > if needed), and boot the server. Add wired hosts by connecting
> > their LAN port to a gateway LAN port (via switches, if needed).
> > Add Wi-Fi hosts by booting them.
>
> An alternative example (with no Wi-Fi):
>
> * One switch or hub. Connect to power.
> * Two or more computers. Connect to the switch/hub, and to power.
> * On each computer, set an appropriate address manually, so they can
> talk to each other.
>
> Use any non-routable IP addressing you like. 192.168.1.* is a common
> choice.
>
> As an even simpler example, if you only have *two* computers, you can
> connect them directly to each other, without needing a switch/hub.
> Back in the olden days (before gigabit ethernet adapters), you would
> have needed a special crossover ethernet cable for this. Now, on
> modern devices, you should be able to use a regular ethernet cable.
>
That came with 100M Ethernet, so there will be extremely little kit
around needing a crossover.
--
Joe
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