[mrtg] CableModem Interfaces
colman at ppllc.com
Tue Jun 7 16:00:29 MEST 2005
I have a cablemodem connected to eth0; eth1 is used for the internal
network. I used cfgmaker to create a config for eth0 and for the interfaces
on the cablemodem (a docsis-compatible SB5100).
I don't understand what the various cablemodem interfaces mean nor do I
understand how I can use these interfaces to graph the bandwidth I am using
when connected to the internet.
cfgmaker found 4 interfaces on the SB5100:
1) ifType: ethernetCsmacd (6); ifName: eth0
3) ifType: CATV Downstream Interface (128); ifname: <none>
4) ifType: CATV Upstream Interface (129); ifname: <none>
5) ifType: (160); ifName: usb0
The downstream interface (interface 3) seems to have exactly the same graph
for incoming bytes as that shown for my server's eth0 interface.
Interfaces 1 and 4 show only outbound bytes but I have no idea what this
represents. Can anyone explain?
Ultimately, what I'd like to graph is the amount of my available bandwidth
that I am currently consuming in both directions. Any suggestions how to do
Sr. Applications Developer
Principia Partners LLC
Harborside Financial Center
1001 Plaza Two
Jersey City, NJ 07311
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