dhcpcd-discuss

Hi Kobi

On 23/06/2013 16:27, Kobi Cohen-Arazi wrote:
> Hi Folks,
>
> In my environment, I'm setting NOARP on the wireless interface and
> then running dhcpcd.
> After dhcpcd is done, I'm clearing NOARP flag from the wireless
> interface. Both setting and clearing the NOARP flag is done from C
> code, kernel mode.
> What I see is some kind of a race condition where even after I clear
> this NOARP flag from the interface, ARP table is not updated.
>
> I need to manually ifconfig "wlan0 -arp" and "wlano arp" (from the
> shell) in order to bring the interface back to a normal operation.
> i.e. have ARP table updated with new entries.
>
> Any idea if the above sequence might trigger some kind of a race
> condition where the whole ARP state is busted?

dhcpcd just checks the existence of the flag IFF_NOARP on the interface 
for the sole purpose of disabling the ARP duplicate address check and 
optionally forcing a route through an interface (this action is logged 
with LOG_WARNING).

dhcpcd does't touch the ARP table itself, nor affect the kernels 
ability to do so

Thanks

Roy