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

[Alex Carver]

If the host has a fixed IP address it doesn't receive the advertisement 
directly, right? I'd have to go manually change it.

On 2022-11-06 13:26, Derek Atkins wrote:
> 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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>