[techtalk] MAC addr from Cable Modem

Wendt,Andrew awendt at neo.rr.com
Wed Jan 19 02:06:28 EST 2000

On Wed, 19 Jan 2000, you wrote:
>Hey Kelly,
>  I don't know if that  is normally the case, however I would think that
>it would not be. The reason that I say this is that the cable modem is not
>directly connected to the computer. It is connected thru cat5 cable.
>ifconfig reports (I may be wrong here) on system devices only. Arp should
>report on it, I'm not sure what's up with that. On my network arp only
>reports 3 out of 4 computers MAC addr. The fourth doesn't even show up,
>even though it's live. Any other suggestion?? This dang thing has got me

ARP will only report the MAC addr of computers that you have sent TCP/IP
packets to as a destination or a gateway. The cable modem probably isn't your
gateway, but just forwards all the packets it sees from the right address. You
would need the cable modem's IP (if it has one?) to use ARP on it. Your modem
probably won't show up on a traceroute, but you could try it.

My friend's cable modem is a Samsung, and has the MAC address stuck on the
side on a sticker. Doesn't say anything obvious like "MAC Addr", just the
digits. My Motorola doesn't though.


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