Subj : Re: Cheap Hosting...
To   : Rampage
From : Arelor
Date : Thu Mar 25 2021 04:39:50

  Re: Re: Cheap Hosting...
  By: Rampage to Arelor on Wed Mar 24 2021 06:30 pm

 > if i'm given an IPv6 /48 block of addresses, i put that into my DHCP server and configure it to hand out those addresses any
 > way i want... so i could take my /48 and have my DHCP server hand out /50s giving me 4 internal
 > subnets... or i could split it into 8 /51s... or even 32 /53s... the only thing that matters is that my DHCP can adjust to t
 > new /48 prefix that my ISP may allocate if i do not have a static /48 with them... as long as my
 > DHCP server can do that, everything should work just fine...

That's the point, if you aren't given a static block, you are screwed.

Not so uncommon scenario:

ISP->Home router->LAN 1->Inner Router->LAN 2

The official way of having LAN 2 have a consistent way of managing dynamic addresses is prefix delegation. Home Router 1 gets
an assignment from the ISP. Then Inner Router gets an assignment from Home Router. Otherwise, if the ISP block changes, the
addresses in LAN 2 get stale and you are not Internet routable anymore.

I have heard about this configuration called prefix cascading.

The problem is that a lot of ISPs won't delegate a dellegatable prefix to you (ie you get a /64 or   the Prefix Exclude Option
set and that's it). And if they don't, many ISP won't have their household supplied routers actually delegate prefixes to Inner
Router's, and since modern ISPs are trying very hard to prevent you from using a custom router as a WAN gateway, you are pretty
much stuck without prefix cascading unless you incur in great efforts.

Which ends up never happening

Because what you do is disable ipv6 in the inner network instead and rant in Dovenet that ipv6 is an overengineered power grab
by ISPs.


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