Samsung phones block WiFi IPv6 when sleeping, delayed notifications

Ole Troan otroan at employees.org
Fri Jun 12 09:54:56 CEST 2015


> On 12 Jun 2015, at 5:31 , Lorenzo Colitti <lorenzo at google.com> wrote:
> 
> On Thu, Jun 11, 2015 at 6:56 PM, Benedikt Stockebrand <bs at stepladder-it.com> wrote:
> they should at least send an RS when they wake up and ensure their
> configuration is still up to date.
> 
> That sounds like a bad idea. If devices send an RS every time the user turns the screen on, and the router responds with a multicast RA, any medium-size network or larger will have multicast RAs flying around every 3 seconds and killing everyone's battery.

then it turns into a silly race… the network is forced to send RAs at very high frequency, because hosts that wake up with expired routers, don’t RS…

RFC4861: "The host re-attaches to a link after being detached for some time.”

I don’t see the purpose of a host re-soliciting unless the last default router is about to expire, NUD fails, strong indication that it has moved…

do we agree that a host that wakes up and has expired its last default router should restart router discovery?
(if I wrote the code on the host, I’d continue to use the expired router until I got a new one).

cheers,
Ole
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