[mrtg] Re: mrtg on a cable modem

[Jake Colman]

It appears that the 3COM HomeConnect External Cable Modem supports DOCSIS and
easily responds to an snmpwalk.  The problem is that I am not all sure what
would be reasonable and sensible things to be graphing off of it.  Does
anyone have a DOCSIS .cfg file that does something useful?

>>>>> "JH" == Jon Heugh <jon at heugh.com> writes:

    JH> Actually, most Cable Modem providers change the community string on
    JH> the modem.  AT&T Broadband, Comcast, and Time Warner for sure change
    JH> there SNMP community strings.  With that in mind there is a known bug
    JH> with the DOCSIS standard on most modems to allow ANY SNMP community
    JH> string for RO operations.  Sometimes an Access list is put on the
    JH> Cable modem to not allow SNMP traffic through the Ethernet port to
    JH> remedy the above problem.  You will also have to jump through hoops
    JH> to get your Cable modem IP address.

    JH> If you are a Network Engineer in charge of Cable modem however you
    JH> will have no problem getting the SNMP info from the cable modems.  If
    JH> you are a customer, it is very hard if not impossible. ( And Designed
    JH> that way)

    >>
    >> You should be able to use the standard DOCSIS Mib for your cable
    >> modem.
    JH> The
    >> PCX1100U is a DOCSIS cable modem.  somix has this mib file out there.
    >>
    >> Trent
    >>
    >> \|||/ c(@ @) __ooO_(_)_Ooo________________________________ Trent
    >> Melcher - Network/Systems Administrator Startouch International
    >> O:402.346.4600x103
    >>
    >>
    >> -----Original Message----- From: mrtg-bounce at list.ee.ethz.ch
    >> [mailto:mrtg-bounce at list.ee.ethz.ch]On Behalf Of Bryant Loftin Sent:
    >> Thursday, January 31, 2002 12:02 PM To: Mrtg (E-mail) Subject: [mrtg]
    >> mrtg on a cable modem
    >>
    >>
    >> I'm working on another home project attempting to MRTG various things
    >> from my PCX1100U obviously this custom scenario will require some work
    >> to
    JH> figure
    >> out what the various OID's are, and MIBS will go a long way in this
    JH> effort.
    >> If anyone has Toshiba PCX1100U MIBS I would really appreciated you
    >> posting or mailing them to me and yes I checked out the stuff from
    >> SOMIX (very appreciated).
    >>
    >> thanks bjl
    >>
    >>
    >>
    >>
    >>
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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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