dhcpcd-discuss

Hi Jayce

On 13/05/2013 17:04, jayce lee wrote:
> I have recreate the 3rd bug in my ubuntu laptop. 
> I first disconnected my wifi connection and run dhcpcd wlan0 with the
> console shows as follows:
>
> sudo ./dhcpcd wlan0
> dhcpcd[17431]: version 5.99.4 starting
> dhcpcd[17431]: wlan0: waiting for carrier
>
> Then I connect my wifi and the bug appears
>
>  dhcpcd[17431]: wlan0: carrier acquired
> dhcpcd[17431]: wlan0: soliciting DHCPv6 address
> dhcpcd[17431]: wlan0: rebinding lease of 192.168.0.108
> dhcpcd[17431]: wlan0: sendmsg: Cannot assign requested address (Errno 
> 99)
> dhcpcd[17431]: wlan0: deleting address 2002:1234:5678:9abc::253/64
> dhcpcd[17431]: del_address6 Cannot assign requested address
> dhcpcd[17431]: wlan0: acknowledged 192.168.0.108 from 192.168.0.1
> dhcpcd[17431]: wlan0: checking for 192.168.0.108
> dhcpcd[17431]: wlan0: leased 192.168.0.108 for 86400 seconds
>
> Perhaps it's a common bug not only in android.

So the problem here is that we need to send from the IPv6 link local 
address on the interface, but at the point of the error it either 
doesn't exist yet or it's in the tentative state which means we can't 
use it until DAD completes.

I think we need to handle this specific error gracefully and add code 
to if-linux.c and if-bsd.c to listen for IPv6 addresses to become 
available and react accordingly.

The other, much easier, solution is to put a delay of say 5 seconds 
from carrier going up to IPv6 starting.

I don't have much free time atm so unsure when a solution would be 
forthcoming.

Thanks

Roy