On Sat, Aug 8, 2015 at 11:00 PM, Juliusz Chroboczek <
[email protected]> wrote:

> I'm confused again.  PIO lifetimes are on the order of hours, or even
> days, while unsolicited RAs are sent every 60s.  Plus there's nothing
> preventing you from sending them more often.
>

The default is 600s, not 60s. And router lifetimes are much shorter than
PIO lifetimes. The field is only 16 bits, the "maximum" (MUST NOT send
more, MUST accept any 16-bit value) is 9000, and the default is 1800.

The RFC 4861 defaults (max interval = lifetime / 3, min interval = max
interval / 3, uniform distribution) equate to one RA every 0.22 lifetimes,
or 4.5 RAs per lifetime. If packet loss is 50%, then you'll miss 4 RAs
6.25% of the time.
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