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Today's Topics:
1. Re: simple DHCPv6 config with /56-Prefix (Simon)
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Message: 1
Date: Mon, 22 Aug 2022 19:34:57 +0100
From: Simon <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: simple DHCPv6 config with /56-Prefix
Message-ID: <751c19ee-5af9-4191-aa69-d53eb67e9...@thehobsons.co.uk>
Content-Type: text/plain; charset=utf-8
Adam Nielsen <a.niel...@shikadi.net> wrote:
>> This is not true in the IPv6 world. All it needs is for a router to
>> advertise that both prefixes are on-link and the hosts can
>> communicate directly. This is one area where IPv6 is fundamentally
>> different (better) than IPv4. For completeness, a router can
>> advertise that a prefix is not on-link - meaning that communications
>> between hosts in the same prefix must communicate via the gateway.
>> This can be the case in some non-broadcast networks, or networks
>> where device-device direct communications is blocked (e.g. for
>> privacy/security in public WiFi).
>
> Very interesting, I didn't know that, thanks for the explanation!
There?s quite a bit different in IPv6 - it?s not just ?extra address bits?. The
opportunity was taken to fix some of the limitations found with IPv4 - such as
the assumption that devices have a single address, and there?s only one subnet
on each network, and all hosts in a subnet have direct communication.
Unfortunately, as many people don?t realise that those problems exist, it?s
seen as making it overly complicated.
I can recommend the free training available at
https://ipv6.he.net/certification/ IMO Hurricane Electric have provided a great
resource (including free IPv6 access via a tunnel over IPv4
https://tunnelbroker.net/). If you complete the certification program, you get
what my local LUG members decreed to be the geekiest tee shirt ever made :-)
Even if you don?t finish it, it worth the effort for the early stages where it
introduces various aspects in a staged manner.
Simon
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