Re: How I turned my cable modem into a sniffer

From: Matt Polchinski (xobliquexat_private)
Date: Wed May 02 2001 - 11:05:52 PDT

  • Next message: Neulinger, Nathan: "Re: How I turned my cable modem into a sniffer"

    I have a 3com HomeConnect Cable Modem, in the manual it says you can access
    it via http://3comcablemodem. The Web Interface gives some nice info like
    max cpes and up/downsteam limits.
    
    Maximum Downstream Data Rate: 2.00 Mb/s
    Maximum Upstream Data Rate: 0.38 Mb/s
    Maximum Number of CPEs: 4
    
    First I tryed setting it to promiscuous mode to see if i could change the
    variables on the modem. (149.112.50.65 is what 3comcablemodem resolves to)
    
    [oblique@demonseed oblique]$ snmpset 149.112.50.65 private
    ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifPromiscuousMode.2 i 1
    ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifPromiscuousMode.2 = true(1)
    
    It worked, set it back just to be safe since thats not what im looking to
    change.
    
    [oblique@demonseed oblique]$ snmpset 149.112.50.65 private
    ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifPromiscuousMode.2 i 2
    ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifPromiscuousMode.2 = false(2)
    
    Then I get a list of all the variables and find two that stand out from what
    I saw on the web interface.
    
    [oblique@demonseed oblique]$ snmpwalk 149.112.50.65 private
    ......
    transmission.127.1.1.3.1.3.1 = 384000
    transmission.127.1.1.3.1.5.1 = 2000000
    ......
    
    When I try to change those I get an error. If they are read only there must
    be a way to change that because RoadRunner has upgraded my speed a few
    times.
    
    [oblique@demonseed oblique]$ snmpset 149.112.50.65 private
    transmission.127.1.1.3.1.5.1 i 2040000
    Error in packet.
    Reason: (noSuchName) There is no such variable name in this MIB.
    This name doesn't exist: transmission.127.1.1.3.1.5.1
    
    -Oblique
    _________________________________________________________________
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