[ale] IPv6 local devices with a prefix that may change

[Derek Atkins]

You use static / fixed local part.  So your host is always 
<prefix>:<fixed>.  So long as you know the prefix you can always reach any 
host.  And the hosts receive their prefix via RA announcements.  So you 
control that too.
A host will never use the old prefix..  Or at least they won't use it for 
long, and once you announce the new prefix it'll renumber itself quickly.
-derek
Sent using my mobile device. Please excuse any typos.
On November 6, 2022 13:58:06 Alex Carver via Ale <ale at ale.org> wrote:

> So that's part of the problem, right?
>
> Let's say the prefix changes, how do I now access devices that are using
> the old prefix? If I have 50 devices then I have to manually change them
> all every time the prefix changes plus change everywhere I use that IP.
>
> With IPv4/NAT I didn't have to worry, they were always the same IP no
> matter what happened outside.
>
> On 2022-11-06 10:51, DJPfulio--- via Ale wrote:
>> On 11/6/22 13:39, Alex Carver via Ale wrote:
>>>
>>> The thing I was primarily asking about is how to be robust against a
>>> prefix change in an IPv6 implementation similar to how IPv4/NAT helps
>>> isolate me from my WAN's IP changing assuming that I don't use NAT
>>> because nearly everyone screams about it if you threaten to use it on
>>> an IPv6 system.
>>
>> Isn't this solved by DNS?  Leave the hostnames the same, regardless of
>> the LAN. Just change the IP stuff in the DNS ... and on the host, of
>> course.
>>
>> I've been burned by using centralized DHCP reservations, so only use
>> them for devices that are portable or don't support a method to manually
>> configure IPs ON-THE-DEVICE.
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