I know that there is a special block that IANA set aside for the vendor part (1st 3 octets) of a multicast MAC address: 00:00:5E. (The addresses above start with 01 instead of 00 because the broadcast/multicast bit is set. Since this vendor block was set aside for multicast, they will really always start off with 01:00:5E.) The rest of the address is somehow calculated from the IP address
Any thoughts? On Thu, Dec 23, 2010 at 10:27 AM, Bruno <[email protected]> wrote: > Taking OSPF as an example, how could they say that the packet sent to > 224.0.0.5 will have destination MAC-address 0100.5e00.0005 ? > Is there any calculation method I should be aware of > > Any thought? > > -- > Bruno Fagioli (by Jaunty Jackalope) > Cisco Security Professional > -- Bruno Fagioli (by Jaunty Jackalope) Cisco Security Professional
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