MRTG and DG834GT

[atari_mark]

Not seen a post about this before so here goes.

I know the DG834GT does not support SNMP so about a year ago I wrote some PERL to log into the router, grab some stats and then graph them with MRTG. The stats I got for TX and RX are from the stats page and are packets per seconds (not bits per second). So I can graph utilisation but it is not Mbps which, to be honest, is pretty crap.

So I can make it look more like my real throughput, does anyone have figures of the average packet size of an ADSL packet? I tried googling it but the sites I found were not too helpfull.

If you are interested you can see my graphs here

I also graph the LAN side, SNR, Sync speed and attenuation.

Regards

Mark
(Network Specialist for an IT firm!)

[mossywell]

Hi Mark,
That's a fascinating question! Firstly, on the subject of SNMP, qwerty12 has written a marvellous article on how to add an SNMP daemon to the firmware here [EXPERTS ONLY] Enabling your DG834GT to use MRTG natively.

However, you you know, SNMP is needed to feed MRTG and simply reading data out of a wget on the stats page will do. You may also have noticed the Tx B/s and Rx B/s fields in the stats web page? Well, if you do some big downloads as a test, you'll see that it doesn't change. That's because the (I believe) the page calculates the average throughput from the uptime. D'oh! So, if you have a big uptime the values aren't really meaningful. So, what I suggest is you grab your data in (via Perl in your case) and calculate the throughput yourself (in Perl would be good!) and present that to MRTG.

FWIW, I had the same issue myself when writing BSR. In the end, I just stuck with the total bytes. If you're interested, the stats page just gets the numbers from ifconfig (but being a network admin, I'm sure you guessed that!).