[techtalk] MAC addr from Cable Modem

[moebius at ip-solutions.net]

Hey Kelly,
  Yeah mine doesn't have a MAC addr on it either. Unfortunately traceroute
give me a hop from my ethernet card directly to my gateway. So I guess for
now I'm outta luck.
Thanks for all the help

Harry Hoffman
Product Systems Specialist
Restaurants Unlimited Inc.
Seattle WA
206 634-3082 ext. 270

On Wed, 19 Jan 2000, Wendt,Andrew wrote:

> 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
> >stumped.
> 
> 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.
> 
> TTFN
> Andy
> 
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