Re: Re: Just how big is IPv6?
  By: Deon George to Arelor on Fri Dec 27 2024 08:03 am

 > I actually like it, I think it provides more benefits than IP4 - but the
 > only hurdle is that both are still in play.
 >

If only IPv6 were available, it would be a nightmare. So much IPv6 stuff is
half-baked at best.

Take SLAAC as an example. It only works on a narrow set of scenarios and can't
convey all the information traditional DHCP does. On a regular IPv4 network
where you want hosts to acquire a gateway, ntp server and dns server upon boot,
you use DHCP to provide them all with it. SLAAC only gets the basics right (IP,
gateway and dns) but if you are serious you are back to DHCP. For even more fun,
SLAAC only works within its narrow scenario IF it operates on a network segment
of EXACTLY a harcoded size.

Then there is the fact my current home deployment is pretty much non-replicable
on IPv6 at all unless the ISP wants to cooperate. Hint: ISP usually don't. Long
story short, I have multiple local address spaces (think 192.168.1.0/24 for IoT,
192.168.2.0/24 for my father's junk, 192.168.3.0/24 for surveillance
apliances... you get the idea).

If you want to break an IPv6 LAN into segments such as the above you are
supposed to pick the prefix provided to you by your ISP and then use DHCP-PD
(aka prefix delegation) to break your network into smaller prefixes and assign
each to each segment. This would be good and fancy if it worked, but

a) your ISP needs support proper prefix delegation, and so many just don't.
b) it sucks that you need cooperation from an external entity in order to
properly administrate your internal network.

And yes, I am aware I could use local addressing, but that removes the
advertising point of having everything in ipv6 be Internet routable by default.

This gets so bad I have seen very nasty patchwork done in order to properly
separate IPv6 segments, such as NAT66 (wtf?!).


--
gopher://gopher.richardfalken.com/1/richardfalken
--- SBBSecho 3.23-Linux
 * Origin: Palantir * palantirbbs.ddns.net * Pensacola, FL * (618:250/24)