[Dnsmasq-discuss] No unsolicited RAs on interface that doesn't exist at startup

[Simon Kelley]

Patch slightly rearranged and applied.


Thanks,

Simon.


On 10/05/18 21:07, Maarten de Vries wrote:
> I noticed that dnsmasq often wasn't sending any unsolicited RAs for me.
> 
> This turned out to happen when the interface (a bridge interface) wasn't
> created yet at the time dnsmasq started. When dnsmasq is started after
> the interface is created, it sends RAs as expected. I assume this also
> extends to other types of virtual interfaces that are created after
> dnsmasq starts.
> 
> Digging into the source, it seems to be caused by a missing call to
> ra_start_unsolicited for non-template contexts in construct_worker from
> src/dhcp6.c. The attached patch adds that call, but only if the
> interface index or address changed to prevent doing fast RAs for no reason.
> 
> I tested it on my own server and it appears to work as expected. When
> the interface is created and configured, dnsmasq does fast RAs for a
> while and then settles into slow RAs.