[mrtg] Re: mrtg on a cable modem

[Trent Melcher]

I got my cablemodem walked last night,  it appears Cox (old @home) has
changed them community string back to public when they moved off of the
@home network.  I was able the walk it and have create a config using
cfgmaker, here are the results.  It looks like it graphs 4 different stats.
upstream, downstream, NIC, and USB if available.
http://www.dawnandtrent.com:3000/mrtgpages/cable.html

Note: There is not much  data in the graphs yet.  I forgot to add it to the
cron last night.  Oooops.

Trent

     \|||/
    c(@ @)
__ooO_(_)_Ooo________________________________
Trent Melcher - Network/Systems Administrator
Startouch International     O:402.346.4600x103


-----Original Message-----
From: colman at ppllc.com.mrtg-bounce@list.ee.ethz.ch
[mailto:colman at ppllc.com.mrtg-bounce@list.ee.ethz.ch]On Behalf Of Jake
Colman
Sent: Thursday, January 31, 2002 8:28 PM
To: Bryant Loftin
Cc: 'Williams, Garth'; Mrtg (E-mail)
Subject: [mrtg] Re: mrtg on a cable modem




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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