dhcpcd-discuss

Hi Tobias

On 11/06/17 15:29, Roy Marples wrote:
> On 11/06/2017 12:07, Roy Marples wrote:
> > On 11/06/2017 10:16, Tobias Klausmann wrote:
> > > Thanks, that makes sense.  I noticed something else with the PD:
> > > it seems that sometimes the exponential delay for REBIND6 makes
> > > me lose the lottery: the delegation expires between two REBIND6
> > > attempts, usually ones that are >5m apart. Is there a way to make
> > > the delays increase at a slower rate?
> >
> > Can you post a tcpdump of the DHCPv6 transaction please, along with
> > dhcpcd logs saying what it thinks the timers are?
> >
> > This sounds like a bug in dhcpcd.
> >
> > There is currently no way to affect the rebind timer once the lease is
> > live (but this also applies to IPv4 counter-parts).
>
> Tobias sent me the tcpdump off list.
> What it showed was that the DHCPv6 server was requesting a unicast 
> transaction.
> This fails in the non master mode case (ie dhcpcd started for a specific 
> interface) because dhcpcd binds to the the link-local address.
> As such the tcpdump showed ICMP uncreahable messages during the renew 
> phase.
>
> Task created here:
> https://dev.marples.name/T123
>
> Patch to disable unicast support until this can be fixed better here:
> https://dev.marples.name/D117
>
> Does this sound like your issue and potential solution Tobias?

I've created a diff for T123 which should fix the issue on the current 
master branch of dhcpcd here:
https://dev.marples.name/D127

Let me know if it works for you!
For some reason my ISC DHCPd server doesn't send the unicast option no 
matter how hard I prod it. Hopefully you can test the patch!

Roy