[SFS] networking question

[contact at brooksimperial.com]

I found the PIE method pretty helpful to explain subnetting.

 

From: SFS <sfs-bounces at lists.sofree.us> On Behalf Of Eric Lehto
Sent: Sunday, September 13, 2020 11:59 AM
To: David L. Willson <dlwillson at thegeek.nu>
Cc: BLUG <lug at lug.boulder.co.us>; sfs <sfs at lists.sofree.us>
Subject: Re: [SFS] networking question

 

Glad to help David. It's very common, but can waste addresses. I'm open until 2 today, or first thing Monday to discuss. Give me a call when convenient.

Eric Lehto
ConvX Practice Director
303-884-1374  |  eric at convx.com <mailto:eric at convx.com> 

 

On Sat, Sep 12, 2020, 5:36 PM David L. Willson <dlwillson at thegeek.nu <mailto: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 <http://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 <http://67.42.246.112/28>  or 67.42.246.120/28 <http://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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