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Router configurations suck (power out of mobile devices, that is)

Warm Braw Silver badge

There is scope in the RFC for the router to send the advertisement either to the device that sent to the solicitation, or to the "all-nodes" group. In the latter case, you risk waking up other sleeping devices to process an RA they didn't ask for, but this seems to be the likely default implementation. This is probably a case where sending the RA directly to the soliciting device would be a better choice.

Oh for the days of "default gateway"...

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