Re: I-D Action: draft-ietf-mboned-ieee802-mcast-problems-05.txt

On Mon, 13 May 2019, Holland, Jake wrote:

> As I understand it, if it has been unicast-mapped, the Ethernet MAC address
> will be your NIC's MAC address, instead of starting with 01-00-5E and
> finishing with the last 23 bits of the group address.  (Or 33-33- and
> finishing with the last 32 bits of the group, for IPv6.)
>
> I think these are where the normative behavior for normal multicast is
> described, and the m2u behavior just uses the unicast ethernet MAC instead:
> https://tools.ietf.org/html/rfc1112#section-6.4
> https://tools.ietf.org/html/rfc2464#section-7
>
> Thanks for taking a look!

On my mac, tcpdump:ing while connected to my OpenWRT 18.06.2 running 
WRT1200AC wifi:

16:49:19.412965 c2:56:27:73:35:13 > 33:33:00:00:00:01, ethertype IPv6 
(0x86dd), length 230: (flowlabel 0x67b7e, hlim 255, next-header ICMPv6 
(58) payload length: 176) fe80::c056:27ff:fe73:3513 > ff02::1: [icmp6 sum 
ok] ICMP6, router advertisement, length 176

So that looks like a regular multicast wifi packet to me? Or does this not 
apply to RAs and ff02::1 packets?

-- 
Mikael Abrahamsson    email: [email protected]

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