MRTG will measure the actual USED traffic rate (averaged over your polling frequency); and can display a percentage relative to your stated maximum.
If you want to know the maximum CAPACITY - IE, the theoretical maximum bandwidth - then you will need another tool that basically squirts data down as fast as it possibly can and measures the rate. Note that this will of course completely saturate your link, and may cause costs if you are charged by data usage. There is some free software called Perfsonar that we use here to measure WAN connectivity which can do this amongst other things. Steve Steve Shipway [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of Tyler, Rodney Sent: Wednesday, 9 July 2014 9:36 a.m. To: [email protected] Subject: [mrtg] WAN Speed I have setup mrtg to monitor traffic for a specific Ethernet interface on a Cisco Catalyst 6509 that connects two campuses over a fiber WAN link. The third party fiber provider says they are giving us 100Mbps across the fiber, but we need to verify what we are actually getting. I have come to realize that simply monitoring the WAN interface gives me a nice graph and actual kB/s (or MB/s) data passed, as shown below; however, the percentages are based on my Maxbytes value that is based on what the ISP says we are getting (100Mpbs or 12.5MB/s). In other words, I can change the percentages by adjusting MaxBytes. Is there any way to use mrtg to verify the available bandwidth over the WAN, or do I need a different tool? Max Average Current In 776.4 kB/s (6.2%) 143.6 kB/s (1.1%) 89.3 kB/s (0.7%) Out 11.2 MB/s (89.5%) 542.1 kB/s (4.3%) 819.2 kB/s (6.6%) Thanks for any assistance, Rodney Tyler
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