Subj : Re: Just how big is IPv6?
To   : Warpslide
From : Deon George
Date : Thu Dec 26 2024 09:00:05

  Re: Re: Just how big is IPv6?
  By: Warpslide to Deon George on Wed Dec 25 2024 09:24 am

Howdy,

 > I initially tried setting my config to request a /62 (4 /64s) and /61 (8
 > /64s) but it didn't seem to work, not sure if its my EdgeRouter 4 or my ISP
 > that doesn't support them but a /48 works fine.

Yeah, I havent got to work out how the backend works - but I see a similar result.

My ISP gives me a /60, and I've played around requesting a /63, /62, and I still get the /60.

 > I could try slicing up one /64 into 4 /66s or something, not sure if my
 > router supports that, but could be a fun exercise to try and see what
 > happens.  I suppose I really don't need to be concerned with
 > hoarding/wasting such a "small" number of addresses.

For the most, and on a VLAN, you'd probably want to stick to a /64 - it'll makes auto configuration easy - and just works. IE: Plug in device, select IP6 and magically it gets one and routing.

Anything less than a /64, you'll need to manage the gateway and routing yourself.

In my case, I play with docker - and containers can have their own IP6 address on their own virtual network. Which is where I use /112s - still gives each docker network 65,535 addresses, and you generally would only use a few on each network :) And since a docker host can potentially have many networks, inside it, I route the /88 to the docker host - manually configured on my router. In reality, I could reduce this to a /96 or even smaller.

The first thing to help, is your gateway address is a link-local fe80::/10, not the first (or last) address in the subnet (which we traditionally do with ip4), and you get that from the device you are routing to after its IP6 stack is running. Generally you dont need to configure the routing back, because it will get that from SLAAC (/64 setup).

 > happens.  I suppose I really don't need to be concerned with
 > hoarding/wasting such a "small" number of addresses.

One of the things I'm liking, and it might just be a conincidence, I see many less bot probs on IP6. The address space is just too big for somebody to probe each one :)


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