Re: IPv6 Performance (was Re: IPv4 Pricing)

[Jon Lewis via NANOG <nanog () lists nanog org>]

On Tue, 2 Dec 2025, Marco Moock via NANOG wrote:

> > Now, if I want to assign static addresses for devices within my home
> > network, I don’t have a problem with v4 - everything’s RFC1918, so if
> > the public IP changes, NBD, and I can even do it with DHCP client
> > IDs. However, if my IPv6 PD changes and my home devices all have GUAs
> > assigned via SLAAC, then… guess what - every IPv6 device address in
> > my network just changed. Oops.
> >
> > Practically, I’ve worked around this by manually assigning LUAs to
> > the devices that need static v6 addresses, like my SAN and the
> > machines that do NFS mounts from it. But 1. that’s more than
> > annoyingly clunky - hardly the improved experience that IPv6 promised
> > - and 2. weren’t we trying to get away from LUAs in the first place?
>
> That is something your ISP is intentionally doing - unrelated to the
> IPv6 specification.
> There is no technical reason not to give a static net to a customer, it
> doesn't cost more (although some ISP charge for that).

It's more work for the ISP (to make the static assignments, delete them 
from DHCPv6 config when a customer terminates service, etc.).  It's much 
simpler to just define DHCP pools (and PD pools) and let the DHCP server 
hand out IPs and subnets and keep track of the leases.

I'm curious though, do any broadband providers [of size] doing v6 assign a 
static PD subnet to each customer?  It's one thing to keep track of a 
handful of statics.  It's another to keep track of tens or hundreds of 
thousands of them.

----------------------------------------------------------------------
 Jon Lewis, MCP :)              |  I route
 Blue Stream Fiber, Sr. Neteng  |  therefore you are
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