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

[Derek Atkins]

Not necessarily.
You can define it as a fixed lower half.
-derek
Sent using my mobile device. Please excuse any typos.
On November 6, 2022 17:45:47 Alex Carver <agcarver+ale at acarver.net> wrote:

> 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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>>

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