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March 2nd, 2016

New WAN Link Emulation Tools Debut From GL Communications


[Satnews] GL Communications Inc., has announced the release of their enhanced WAN Emulators with Random Impairments.

GL's WAN emulators are IPLinkSim™ and IPNetSim™ and are capable of emulating a WAN link, and introducing typical WAN impairments like Bandwidth Throttling, Latency, Jitter, Packet Loss, Packet Reordering, Packet Duplication, Packet Corruption, Congestion Emulation etc. Both the products act as a transparent Ethernet bridge and can be connected between two LANs easily emulating a WAN link in the lab.”

IPNetSim™ supports user defined streams to classify the traffic into up to 4 streams (for 10Gigabit link) and 16 streams (for 1Gigabit link), and applying separate impairments for each stream independently, thus emulating multiple WAN links within a single device.  It also supports bi-directional full wirespeed emulation, i.e., approximately 30 million packets/sec in each direction aggregating to a total 60 million packets/sec.

IPLinkSim™ supports single stream only, and applies the same impairments to all the traffic without segregating the traffic. In addition to the above impairments, IPLinkSim™ supports congestion emulation by allowing background traffic emulation.  GL now enhanced aforementioned WAN Emulators with the capability to better model real-world impairments such as Packet Loss, Packet Reordering, Packet Duplication, and Packet Error Insertion.”

GL's WAN emulator's Packet Loss model has been enhanced with a randomize option. Now, the Packet Loss model has two options – Periodic and Random Loss. User can set a Packet Loss Rate and select either Periodic or Random to emulate the loss. For Periodic emulation, the packets selected for dropping will be constant and predictable—e.g., if a Packet Loss rate of 1 percent is specified by the user, then 1 packet out of 100 packets will be dropped, i.e., for every 100 packets received, 100th packet will be dropped consistently.

In real world conditions, Packet Drop is not predictable, as packet dropping will be random.  To help emulate true real life Packet loss, option for "Random Packet Loss" has been introduced.  Using this option, user can randomize the packets selected for dropping. Though packets are selected randomly for dropping, the configured rate is still maintained.

Real world Packet Loss is many times bursty in nature i.e. a bunch of consecutive packets are lost. To emulate such conditions, a new feature "Burst Packet Loss" has been added.  This feature allows user to drop a burst of packets at a time instead of a single packet.  User can specify the Minimum and Maximum burst size (in terms of packets), and at run time, a random burst of packets (between the Minimum and Maximum) will be dropped at a time.

Another enhancement to the Packet Loss model is manual drop and this model allows user to manually drop either a single packet or burst of packets at run time. This drop will be in addition to the rate packet loss if active. Packet reordering model has been enhanced to include Random Packet Reordering, in addition to the existing Periodic Packet reordering.  Using the Random option, user can randomize the Packets selected for Reordering, but still maintain the specified Reorder rate. Similar to Manual drop, user can choose to introduce instantaneous packet reorder at run time. When selected, it will immediately reorder a single packet.

Randomness has been added to Packet Duplication option, in addition to the existing Periodic Duplication option. In the Random Duplication option the packet selected for duplication (based on the rate) will be random (instead of periodic), but the duplication rate is maintained. A single packet can be duplicated instantaneously by the user at run time.

Randomness has been added to the Packet Error Insertion option, in addition to the existing Periodic Error Insertion option. In the Random Error Insertion option, the packet selected for error insertion (based on the rate) will be random (instead of periodic), but the Error insertion rate is maintained. User can introduce error into a single packet at run time.