[mrtg] Re: mrtg on a cable modem

[Jake Colman]

Bryant,

What exactly are you graphing when you look at the LAN side versus the WAN
side?  What will the snmp queries to the two sides represent?  Do you have a
useful mrtg.cfg file that queries and gaphs the two sides?

...Jake

>>>>> "BL" == Bryant Loftin <bloftin at Insight.com> writes:

    BL> You can try directly connecting to your cable modem and do a SNMP
    BL> walk on public at 192.168.100.1 I read this is a factory default for
    BL> many cable modem LAN side interfaces (assuming your ISP hasn't
    BL> tweaked it). Then look for an OID that has an IP value like
    BL> 10.2.222.3 or 172.17.3.4 most likely your provider us using 10.0.0.1
    BL> or 172.17.0.1 as gateway's so it's not going to be those.

    BL> My Toshiba wouldn't play this game so...

    BL> This is what I did to get my WAN side modem IP:

    BL> Environment: I'm using W2K and have netmon with driver from SMS2.0
    BL> loaded for promiscuous packet sniffing.  I Directly connected to the
    BL> modem; no router etc.  W2K is set for same IP network range as the
    BL> modem internal interface
    BL> 192.168.1.2 255.255.255.0 (most DOCSIS cable modems come from the
    BL>                           factory
    BL> with the internal (LAN side) IP set to 192.168.100.1. I don't know if
    BL> this is a standard?

    BL> Turn off cable modem, turn on packet sniffing, turn on cable modem.

    BL> The first packet to come through was a DHCP nack from WAN side
    BL> containing the IP for my modem. I was surprised to see this show up
    BL> on the LAN side but it worked. Both LAN and WAN sides reply to SNMP
    BL> reads using public.

    BL> Side note: My standard setup is using a linksys befsr11 between my
    BL> boxes and the modem.  So when the befsr11 is in place the LAN side IP
    BL> isn't routed but with port 161 enabled I can still get read's from
    BL> the WAN side IP.

    BL> have fun.  bjl


    BL> -----Original Message----- From: Williams, Garth
    BL> [mailto:gkwilliams at epcor.ca] Sent: Thursday, January 31, 2002 2:58 PM
    BL> To: Mrtg (E-mail) Subject: [mrtg] Re: mrtg on a cable modem



    BL> 	I have been working this avenue myself recently.  Using
    BL> 	Ethereal and
    BL> the PCAP driver, I am able to get the MAC address of my cable modem.
    BL> Any ideas on how to proceeed to get its IP address with this
    BL> information?

    BL> 	g

    BL> 	<snip>
    >> You will also have to jump through hoops to get your Cable modem IP
    >> address.
    >>
    BL> 	</snip>


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-- 
Jake Colman                     

Principia Partners LLC                  Phone: (201) 946-0300
Harborside Financial Center               Fax: (201) 946-0320
902 Plaza Two                          E-mail: colman at ppllc.com
Jersey City, NJ 07311                  www.principiapartners.com

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