Re: [802.1] Re: [LinkSec] IETF PANA
Hi Norman,
The PAA multicast group address is currently TBD. We'd need to get one
assigned by IANA. Once we have that address, the corresponding MAC address
is determined as discussed in other specifications, such as RFC2464 for IPv6
multicast on Ethernet:
7. Address Mapping -- Multicast
An IPv6 packet with a multicast destination address DST, consisting
of the sixteen octets DST[1] through DST[16], is transmitted to the
Ethernet multicast address whose first two octets are the value 3333
hexadecimal and whose last four octets are the last four octets of
DST.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 1 1 0 0 1 1|0 0 1 1 0 0 1 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DST[13] | DST[14] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DST[15] | DST[16] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
So, the MAC address will be calculated based on the IP multicast address
selected by PANA design.
Alper
> Alper,
>
> If PANA messages are L3 messages, and if a multicast MAC address is
> used, then it should be either the broadcast MAC address, or a multicast
> MAC address meaning, "all those endstations that understand PANA." That
> multicast MAC address can be assigned by the IETF, and would presumably
> use the IETF OUI. Either way, the multicast bit in the destination MAC
> address would prevent the packet from being forwarded by a router.
>
> Using a MAC address from the bridge BPDU set would be completely
> inappropriate, as the bridges should be transparent to an L3 protocol.
>
> What destination MAC address is used?
>
> -- Norm (a long time in 802.1) Finn
>
> Alper Yegin wrote:
>>
>
>> The destination MAC address of the PANA messages are always unicast, except
>> for the initial discovery message (rightfully).
>
>
>