Kerry, here is a copy of a response I sent to the group last year along with
an URL you
can check out which may help you also:
First of all, the high order 25 bits of the ethernet (mac) address is equal
to 01-00-5E
and the low-order 23 bits of the ip multicast group id is placed into the
low order 23 bits of the ethernet address.
Taking the last 3 octets of the 224.163.163.45 address will
leave you 163.163.45. In most cases 163 does convert to A3,
however the second octet of the 224.163.163.45 address only
has 7 useable bits (when dealing with multicast only).
so translating to binary normally you would have:
10100011.10100011.00101101=163.163.45
8 bits 8 bits 8 bits
or A3-A3-2D using 24 bits of address space.
translating for multicast purposes would drop the first bit
of the second octet and give you the following:
0100011.10100011.00101101=35.163.45
7 bits 8 bits 8 bits
or 23-A3-2D using 23 bits of address space.
(note that 35 translates to 23 hex)
so, the complete mac address will be 01-00-5E-23-A3-2D
Here is a great URL at 3com by Chuck Semeria and Tom Maufer
http://www.3com.com/nsc/501303.html
..dj
""Ikpasa, Kerry"" <[EMAIL PROTECTED]> wrote in message
9F069D9AB00BD411B2D000508BDF45587C0EDD@ADUROEX01">news:9F069D9AB00BD411B2D000508BDF45587C0EDD@ADUROEX01...
> Hello People,
> I am studying for the BCMSN exam, I am having problems reconciling
> Multicast IP addresses to Ethernet address.
> Could someone help me with the addresses below, an explaination would be
> appriciated
>
> IP Multicast Address --->> MAC Address
>
> 224.163.163.45
>
> 224.0.9.45
>
> Thank you
>
> Kerry
>
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