NST Network Interface Bandwidth Monitor 2
Overview
The NST Network Interface Bandwidth Monitor 2 is a second generation interactive dynamic SVG/AJAX enabled application integrated into the NST WUI for monitoring Network Bandwidth usage on each configured network interface in pseudo real-time.
A use case for the Bandwidth Monitor can be found in the Wiki article: "LAN Ethernet Maximum RAtes, Generation, Capturing & Monitoring".
See page: NST Network Interface Bandwidth Monitor for additional information until this page is completed.
The following Bandwidth Monitor displays network traffic to and from the NST Wiki site. A TP-CU3 Tap is inserted between the NST probe and the NST Wiki site providing full-duplex traffic access. A Custom Monitor was created to display interface traffic on the Tap's two (2) monitoring ports: p3p2 - RxD and p3p1 - TxD. The Ruler Measurement Tool is also enabled and focused on a typical HTTP web page transaction sequence.
NST Bandwidth Monitor 2 Reference Diagram
Use this section as a reference for location and description of all controls available with the NST Network Interface Bandwidth Monitors. The image below can serve as a general reference diagram for a single Bandwidth Monitor. Many of the Bandwidth Monitor features have been identified and marked on the image. A Threshold Pause feature that allows "Pausing" of one or more Bandwidth Monitoring graphs when a configured Threshold Armed Rate value is Reached or Exceeded (i.e., Triggered) is also shown. Custom executables can also be run each time a Threshold Pause state change occurs. As an example, one could initiate a network packet capture when a sustained bandwidth data rate exceeds a certain level.
The reference diagram below depicts a Threshold Pause session that was configured on the "p4p1 Bandwidth Monitoring" graph with an Armed Rx bandwidth data rate of: "8.3 Mbps". This bandwidth rate was maintained for the Armed duration of "2400 msecs" as a condition for the Threshold Trigger to occur. A Threshold Trigger event did occur on 2012-08-29 14:22:38.145 at an Rx data rate value of: "27.41 Mbps". A Post Trigger Delay of "5 seconds" was in effect. Three (3) bandwidth monitoring graphs were set to be Paused: p4p1, p5p1 and p7p1. A query rate of "200 msec" was also configured for bandwidth monitor graph updates.
All notification executables located in directory: "/etc/nst/notifications/bwmon" were run at each Threshold Pause state change and marked with ID: "PXN-1827".
The traffic generated for this example was from a YUM update. A Dualcomm DGCS-2005L TAP was used on the external side of a firewall and presented the network traffic to interface: "p4p1".
