[SFS] networking question

[Chris Fedde]

There are three main approaches:

* Routing a subnet
* Bridging and filtering
* NAT

Depending on the scenario NAT might be the best approach.  You can use any
of the RFC1918 addresses inside that is not used outside.
a few DDG searches should get you the interface and firewall commands
needed.

chris

On Sat, Sep 12, 2020 at 5:36 PM David L. Willson <dlwillson at thegeek.nu>
wrote:

> This feels like a newbie question that should be obvious to me, but it's
> not obvious to me, so I'll ask.
>
> If I have a subnet behind my router, and I want to put *part* of that
> subnet (a sub-subnet?) behind an interior router (sub-router?)... Can I do
> that?
>
> Example (the actual case in point):
>
> I have 67.42.246.112/29. It routes through 67.42.246.126. I have control
> of 67.42.246.126. It's not Linux, but it's not entirely brainless, either.
>
> Is there a way for me to carve the upper or lower /28 (67.42.246.112/28
> or 67.42.246.120/28) off into an interior subnet and put it behind an
> actual Linux box?
>
> Come to look at it, I guess it would have to be the lower half, or I'd
> have to re-number my router. Not the end of the world, but no sense adding
> pointless work, either.
>
> I know I lose three addresses in the process for the new network, router,
> and broadcast address, but is it *possible*? Does it work? If so, could I
> get a hand setting it up?
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