[mrtg] Re: mrtg on a cable modem
Jon Heugh
jon at heugh.com
Fri Feb 1 05:32:25 MET 2002
Some of the more useful OIDs for the Cable modem are:
.1.3.6.1.2.1.69.1.3.2.0; ### Bootfile name
.1.3.6.1.2.1.69.1.3.1.0; ### Bootp Server
.1.3.6.1.2.1.10.127.1.1.1.1.2.3; ### Downstream Frequency
.1.3.6.1.2.1.10.127.1.1.3.1.5.1; ### Downstream Speed
.1.3.6.1.2.1.17.4.3.1.1.0; ### Hosts behind modem
.1.3.6.1.2.1.69.1.4.5.0; ### Image File
.1.3.6.1.2.1.10.127.1.1.4.1.6.3; ### Micro Reflections
.1.3.6.1.2.1.69.1.5.8.1.7; ### Modem Message Log
.1.3.6.1.2.1.2.2.1.6.2; ### modemmac
.1.3.6.1.2.1.10.127.1.1.4.1.5.3; ### Noise
.1.3.6.1.2.1.69.1.3.5.0; ### OS Version
.1.3.6.1.2.1.1.1.0; ### System Description
.1.3.6.1.2.1.10.127.1.2.2.1.3.2; ### Transmit Power
.1.3.6.1.2.1.10.127.1.1.3.1.3.1; ### Upstream Speed
.1.3.6.1.2.1.1.3.0; ### uptime
These OIDs will work on any DOCSIS Cable modem.
The Modem message log is an eventlog of the modems boot cycle (aka syslog )
very handy
Micro reflections and Noise are cable terms for the quality of your
connection. These will change over time. (MRTG ???)
Upstream and Downstream speed are usful to see what your bandwidth is set
to. (most people allready know this value)
Image file name is the config file that youtr modem downloads each time it
boots that tells it what settings to use.
Usually the Image file name has a naming convention that denotes what speed
you have and how many IPs you have.
The System description will tell you what Modem you have and what firmware
version you have on your modem.
----- Original Message -----
From: "Jake Colman" <colman at ppllc.com>
To: "Bryant Loftin" <bloftin at insight.com>
Cc: "'Williams, Garth'" <gkwilliams at epcor.ca>; "Mrtg (E-mail)"
<mrtg at list.ee.ethz.ch>
Sent: Thursday, January 31, 2002 9:28 PM
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>
>
>
> BL> -- Unsubscribe
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>
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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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