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Comment by tcfhgj | Hacker News Reader

for dyn-dns? what's the problem exactly?

You just update the IP (or just the prefix) when the IP changes

Perhaps keep in mind that the interface id of the device the DNS entry should point is different for every device in the network.

Some use the router to update the IP and put the interface id of the router into the update url...

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The problem is I run my own DCHP server (mainly because I have stuff like PXE booting set up).

I can configure the ISC dhcpd for IPv6 but I wouldn’t know what prefix to use in any automated way. So whenever the modem disconnects/reconnects, for whatever reason, I then need to somehow manually update the DHCP server.

Not an issue for ipv4 with NAT. But enough of a problem with IPv6 that I gave up on it. However I do accept that this is a problem of my own making (ie not using ISP provided equipment).

You can run stateless DHCPv6, i.e., without handing out prefixes. It's a fairly normal situation that clients choose their own addresses from prefixes handed out via RA, but that they get auxiliary configuration (such as UEFI boot, or DNS servers before RDNSS was a thing) from DHCPv6. You'd probably need to make sure there was an RA on the network hinting about a DHCPv6 server (the “Other” flag), though.

For others who might be thinking about providing assistance, check this subthread to see if what you're thinking of suggesting has already been suggested: <https://news.ycombinator.com/item?id=44771590>

Your other problem would be Android not supporting DHCPv6.

If you need IPv6 on Android, your only option is SLAAC.

This is such a dumb problem with IPv6. Unless ISP stop being crappy and start offering static prefixes to regular residential subscribers, then I just don't see how v6 would ever be practical. This seems like a big oversight in the design and implementation of v6.

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