A serial port does not have a MAC address.  In IPX, a host address
consists of the network address followed by a six-byte host portion
which--as you noticed--gets borrowed from the MAC address of the
ethernet interface.  So, the serial link does not have a MAC address,
but it borrows the MAC address from the ethernet interface to construct
an IPX host address.  This sort of thing is not necessary with IP.

HTH,
John

>>> "Cisco Nuts"  1/14/02 1:14:35 PM >>>
Hello,
Sorry for my previous email regarding seeing the mac address used by a

serial port.
The correct post should have been "What test can I do on my router to
see 
the mac address used by the serial port from the output of a #debug 
broadcast command ??

And incidentally, this command is only available on ios ver. 10.3 which
I am 
running on my 4500.
But NOT present on ios 11.3 or 12.0.9?? Looks like the #debug arp has 
replaced it??

Please advsie


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