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Old 08-06-2003, 11:28 AM   #1
Registered: Jun 2002
Location: Midwest
Distribution: Slackware
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DHCP & Cable Modem

Having become thoroughly acquainted (and thus confused) by
my cable modem/network setup, I have a nagging question.

My file contains a reference:


which is of course a MAC address for some part of cable
head end setup. Unfortunately, this doesn't match the MAC
address of my assigned gateway (the public address of the
cable head end). I can only use ARP to find the MAC of
the public address; there are no ARP entries associated
with the private address even though I know what it is from

Can anyone tell me which piece of hardware this address
is supposed to represent? Is it the MAC address of the
DHCP server (DHCPSID)?

Old 08-06-2003, 04:53 PM   #2
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Whats the mac address of your network card?
Old 08-06-2003, 05:50 PM   #3
Registered: Jun 2002
Location: Midwest
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I'll show mine if you'll show me yours!
Old 08-06-2003, 06:21 PM   #4
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Try doing 'ifconfig eth0'. My bet is its the same MAC address.
Old 08-06-2003, 10:16 PM   #5
Registered: Jun 2002
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Actually, it is not. It is a MAC address of some part or counterpart
of the cable head end or ISP-side cable network.

Oddly enough, it differs from the MAC address of the gateway
(or public address of the UBR) only by the last hex digit twosome.

In other words, it looks like this:

Gateway IP=00:0B:5F:EE:86:D9

I've looked everywhere for a description of DHCPSHADDR, but
cannot find anything definitive.

It's not that important since everything works just fine, but
I hate to leave these little questions unanswered.

A good reference for cable network's and how they
are set up is:


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