> On Sep 3, 2024, at 16:48, Chris Ross <[email protected]> wrote:
>> On Sep 3, 2024, at 10:28, Mike Fischer <[email protected]> wrote:
>>
>> There are two parts to this:
>> - The IPv6 prefix.
>> - The IID.
>>
>> The changes of the IPv6 prefix are generally triggered from the outside
>> (Internet provider). So here some mechanism to notify about changes would be
>> nice.
Okay. Many weeks later and I have a related question. I’m away from the
“switching between routers” phase, and just have the one ever. But, the IPv6
network it advertises can change when my upstream delegates me a new one (via
DHCPv6 IA_PD).
Looking, I think devd will let me monitor for this in FreeBSD 14, but not 13,
and not other OSes. It looks like dhcpleasectl may be able to do this for me
in OpenBSD. But, I haven’t found anything portable.
So, I’m looking into writing a daemon that can be notified when the IPv6
network/address changes on an interface. But, I can’t yet find a portable way.
It looks like a PF_NETLINK socket can do this on FreeBSD and Linux, but that
is not available in OpenBSD (7.5). How can I register interest in the address
changes on a network interface in OpenBSD? Can this be done with PF_LINK or
PF_ROUTE? (Just thinking randomly)
Obviously, polling is an option, but I’d rather be notified by the kernel when
I need to.
Thanks.
- Chris
