dhcpcd-discuss

Hi,

I want to realize kind of a "stand-alone" mode on a Raspberry Pi IPv6 
router. The RasPi IPv6 router can work either (1) as a cascaded router, 
where it asks its upstream delegating router for IPv6 prefixes and 
assigns them to its own downstream interface(s). When there is no 
upstream connection, the RasPi should switch to (2) stand-alone mode: it 
then should configure its downstream interface with a static ULA prefix. 
However, as soon as there is an upstream router coming back and 
delegating a prefix, the ULA prefix should be removed from the 
downstream interaces.

When looking through hook scripts and dhcpcd sources I've noticed the 
DELEGATED6 hook $reason, but this covers a new lease, or a dropped lease 
on a downstream interface. When there hasn't been any delegated prefix 
before, this would not trigger (at least that's my limited understanding 
here). In addition, I cannot assume that there is an old, still valid lease.

I've seen the syslog timeout notice that dhcpd sends after its initial 
leasing attempt has been failed. But there does not seem to be a hook 
reason for this? Or did I miss it?

Of course, any help here greatly appreciated! And finally, thank you 
very much for dhcpcd!

Best regards,
Harald