[FS#426] odhcpd: consider sending some low-interval multicast RA

[LEDE Bugs]

The following task has a new comment added:

FS#426 - odhcpd: consider sending some low-interval multicast RA
User who did this - Juliusz Chroboczek (jch)

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I've just checked that odhcpd sends periodic RAs to the all-nodes multicast address:

    IP6 fe80::xxxx:xxxx:xxxx:xxxx > ff02::1: ICMP6, router advertisement, length 64

It happens here:

  https://github.com/openwrt/odhcpd/blob/master/src/router.c#L473
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=426#comment1988