On Tue, 10 May 2016, Erik Kline wrote:

It's really not clear to me what that version of rdisc6 would print if
it encounters options about which it did not know anything.  A pcap of
just an RA would be best.  The adb commands I pasted should also
suffice to show what the device thinks it has for DNS, routes,
everything.

The version of rdisc6 included in Ubuntu 14.04 displays recursive DNS server.

This is also seen in "tcpdump -vvv -n -i eth0 icmp6" and I see it as:

rdnss option (25), length 24 (3):

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Mikael Abrahamsson    email: [email protected]

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