n3s0 || journal

    Entry 06-20-2025

    Posted on 2 mins

    Journal

    Table of Contents

    01:33

    Notating RFC 6598 or Carrier-grade NAT (CGN or CGNAT); which is used by ISPs as a private network for their customer equiptment (CPE). Not to confuse this with RFC 1918 . RFC 6598 is a /10 subnet the carrier can use to manage their customer routers. Although RFC 1918 address space can be used for CGN networks. It’s not best practice.

    Best practice is to utilize the following address space or the like.

    For more reading on the subject; and for future reference. I’m including a few links to the CGN RFC.

    I might make a notes article for the concept and what RFCs cover it. These can be boring documents for most people. So, the gist of it may be helpful. Some of the smartest people I have peers who’ve read the RFC(s) for a concept a couple of times so they have a baseline of the concept. Others take the approach of learning from the vendors who develop software implementing the protocol. Software vendor implementation can differ. But, at the end of the day. If you’re fixing the issue. That’s what matters.

    01:56

    Given that I mentioned RFC 1918 . It might be a good time to discuss it a little. It’s probably the first thing anyone in IT or within the general public should learn if they expect to troubleshoot private networks.

    I will also put together some notes for this and post it in the future.

    02:14

    I have come to realize that I need to not think about IPv6 networking with an IPv4 brain. The concepts with IPv6 are completely different. I’ve been working with IPv4 all my life. I default to it for everything because it works well. But, I think the next capter is to start thinking about both. Not to mention, think a bigger about how it all works. No pun intended.