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IPNetSim™ - Multi Stream IP WAN Emulator

IPNetSim™ 1G MultiStream - Rack System Software Ver 7.6.9 | Download Now!


IPNetSim™ emulates a bidirectional WAN IP Link with a 10 Gbps or a 10/100/1000 Mbps full duplex link. For each direction, incoming traffic can be identified into separate user defined streams (up to 16 streams for 1 Gbps pipe and up to 4 streams for 10 Gbps pipe). These user defined streams can be modified to simulate network impairments.

IPNetSim™ comprises of 4 ports, of which 2 ports support 10/100/1000 Mbps in either Electrical or Optical mode, emulating a 1Gbps full duplex pipe. The optical mode supports only 1000 Mbps using SFPs enabling testing on optical fiber. The other two ports on the unit support 10 Gbps using 10 Gbps SFP+s.

IPNetSim™ appliance is available with additional licenses for 1Gbps/10Gbps ports. GL also offers IPNetSim™ as a portable Touch-screen handheld unit which makes it highly suitable for field testing.

Main Features

  • Emulates 1 bidirectional WAN Link (16 streams on 1 Gbps ports and 4 streams on 10 Gbps ports) per unit.
  • Emulate WAN conditions separately and independently on each direction. Acts as a transparent bidirectional link or a simple Ethernet Bridge for easy integration with any test setup.
  • ”Stream Definition” feature to classify the traffic on each port into separate streams (up to 16 streams on 1 Gbps ports and 4 streams on 10 Gbps ports).
  • Supports both Raw (bit level) and Packet mode (header fields) stream configurations
  • Streams can be defined with various header fields like Source/Destination MAC Address, VLAN Id, MPLS Label, Source/Destination Ipv4 Address, Source/Destination UDP ports
  • Up to 120 bytes wide stream definitions covering entire packet header from MAC to UDP and also Payload
  • For each stream definition, offset can be set to any byte within the packet (from 0 to 2047) which gives flexibility to define any fields within any protocol headers, and even the payload
  • Independent per stream WAN impairments helps emulate different WAN links in a single device
  • Detailed per stream Tx Rx frames statistics for easy performance monitoring
  • Live throughput graphs per stream to visualize the effects of WAN impairments on the traffic
  • Check the stability or performance of the network with various real world WAN conditions including:
    • Bandwidth control option to emulate various WAN link speeds (Modem, DSL, T1/E1/T3/E3/OC3/OC12 etc) – 1 Kbps up to 10 Gbps
    • Latency/Delay (0 milliseconds up to 1.5 seconds per stream (for 1Gbps link)/0.5 seconds per stream (for 10 Gbps link) – single delay, uniform, random distributions) to emulate various wired, wireless, and network elements
    • Packet Loss (loss rate % of total packets 0–100%)
    • Packet Reordering (reordering rate (0-100%) with Delay Range of up to 2 seconds
    • Packet Duplication (percentage of total packets duplicated 0 - 100%)
    • Logic Error insertion (10^-1 to 10^-9 error rate) within Ethernet packet to emulate faulty network devices or interference
    • Maximum Frame Size supported – 2048 bytes
  • Supports both Periodic (constant and predictable) and Random (unpredictable real world conditions) impairment (Packet Loss, Packet Reordering, Packet Duplication, and Error Insertion) options.
  • Supports transmission of Ethernet Pause frame with user-defined quanta used to throttle Ethernet link overload.
  • Command Line Interface for automated testing and remote accessibility.

Product Specifications

Hardware Specifications

IPNetSim™ 1G/10G
Tablet Inspired Portable Unit

IPNetSim™ 1G/10G
1U Rack Unit

IPNetSim™ Tablet Inspired licenses

  • IPN505 (1G ports)

IPNetSim™ 1U Rack option licenses

  • IPN502 (1G ports)
  • IPN504 (10G ports)
  • 2 x 1 Gbps Base-X Optical OR 10/100/1000 Base-T Electrical
  • 2 x 10 Gbps Base-SR, -LR -ER Optical only
  • Single Mode or Multi Mode Fiber SFP support with LC connector
  • Optional 4-Port SMA Jack Trigger Board (TTL Input/Output)
  • Bus Interface – None or USB 2.0


  • 19” rack option, w/ Embedded Single Board Computer (SBC).
  • SBC Specs: Intel Atom CPU, 4GB RAM, Windows® 7, MSATA SSD, 4 USB Ports

Meanwell p/n GS60A18-P1J, External Power Supply

  • Input 90 ~ 264 VAC @ 47 ~ 63Hz -or- 135 ~ 370VDC
  • Output 18vDC, 3.33A, 60W, Power plug 2.1mm ID x 5.5mm OD x 11mm L

TDK-Lambda p/n LS150-12, Internal Power Supply

  • Input 88 ~ 132 / 176 ~ 264VAC (switch selectable) @ 47 ~ 63Hz -or- 248~273VDC
  • Output 12vDC, 150W

Physical Specification:

  • Length: 6.39 in. (162.22 mm)
  • Width: 9.96 in. (252.93 mm)
  • Height: 2.59 in (65.96 mm)
  • Weight: 4.75 lbs. (2.15 kg)

Physical Specification:

  • Depth: 16.00"
  • Width: 18.94" (with rack mounting flanges)

                 16.73" (without rack mounting flanges)

  • Height: 1.72"
  • Weight: 5.75lbs

Environmental requirements 
Tablet Series (Dell Venue 8 Pro 5000 series):

  • Operating 0°C to 35 °C
  • Non-operating -40°C to 65 °C
  • Operating humidity 10% to 90% (non-condensing)
  • Non-operating humidity 5% to 95% (non-condensing)
  • Operating Altitude -50 ft to 10,000 ft
  • Storage Altitude -50 ft to 35,000 ft


Software Specifications
Stream Definition Parameters
  • IP Source and Destination Address Range
  • UDP Source and Destination Port Range
  • MAC Addresses
  • MPLS Label
WAN Emulation Parameters
  • Bandwidth control – 1 Kbps up to 10 Gbps
  • Latency/Delay
    • 0 milliseconds up to 1.5 seconds per stream (for 1Gbps link)
    • 0 milliseconds up to 0.5 seconds per stream (for 10 Gbps link)
    • single delay, uniform, random distributions)
  • Packet Loss Rate - 0–100%
  • Packet Reordering Rate - 0-100% with Delay range of up to 2 seconds
  • Packet Duplication Rate - 0 - 100%
  • Logic Error insertion Rate - 10^-1 to 10^-9
  • Maximum Frame Size Supported – 2048 bytes

Working Principle

IPNetSim™ is connected to the 2 end points of a WAN link. It can be configured to act either as a transparent bidirectional Ethernet link or a simple Ethernet bridge between 2 end points. The links are emulated between Port 1 (P1) and Port 2 (P2). IPNetSim™ bandwidth can be controlled to simulate various WAN link speeds (RS232/DSL/Modem/T1/E1/T3/E3 etc.).

P1 -> P2 is one link and in the reverse direction, i.e., P2 -> P1 forms the other link. By default, P1 and P2 work in pass-through mode, and pass all frames across to the other port. Frames arriving at P1 are carried over to P2 and frames arriving at P2 are carried over to P1.

Transparent Bidirectional Link (P1-P2)/(P2-P1)

In each direction, user can define streams (based on various header fields) to classify traffic into multiple streams. For each stream, a different set of WAN Emulation parameters can be applied, a single IPNetSim™ can emulate different WAN scenarios like Head Office to Data Center, Head Office to Branch Office etc.

IPNetSim(Multi-Stream WAN Emulator) connecting 2 network end points

WAN Emulation includes various real world impairment settings such as Bandwidth, Latency, Packet-Loss, Error Insertion, Reordering, and Duplication, to check the performance of end equipment to real world impairments. These settings can be applied for the selected 16 unique streams on 1Gbps link and 4 unique streams on 10Gbps link independently in each direction

Traffic (bidirectional streams) can be processed at wirespeed (1Gbps or 10Gbps). Bidirectional streams can be configured as a symmetrical (identical WAN impairments in both directions) or asymmetrical (different WAN impairments in each direction). WAN impairments can be configured independently for each stream. When WAN Emulation is started by the user, the impairments are introduced into the traffic as shown below.

Impairments over P1->P2 and P2->P1 Link

Stream Definition

As depicted in the figure, IPNetSim™ includes a powerful “Stream Definition” feature that permits user to configure MAC, IP, VLAN, MPLS, UDP header fields to classify the traffic flows.

There are two actions for the stream definitions:

  • Stream: Packets matching the stream definition are sent as specified stream.
  • Bypass: Packets not matching the stream definitions are forwarded without emulation.

For each stream, user can define the stream parameters separately for each direction (P1 ->P2 and P1 <- P2). Streams can be defined in two modes – Packet Mode or Raw Mode.

In Raw mode, user can select a 120 byte window anywhere within the frame (starting from MAC Destination Address field till the end of Payload) to compare and identify the stream using raw hex data (120 bytes) and an offset. User can also define a corresponding 120 byte Hex mask, so that each bit can be set to ‘Compare’ or ‘don’t care’ conditions.  For each stream definition, offset can be set to any byte within the packet (from 0 to 2047) which gives flexibility to define any fields within any protocol headers, and even the payload In Packet mode, each field can be compared against either a fixed value, a range of values or ANY value. Various packet field values can be edited directly as per the layer stack (L2/L3/L4) selected. Streams can be defined based on various fields like Source/Destination MAC Address, VLAN Id, MPLS Label, Source/Destination IPv4 Address, Source/Destination UDP ports etc.

Stream Definitions in Raw Mode
(16 streams on 1G ports)
Stream Definitions in Packet Mode
(16 streams on 1G ports)

Stream Statistics

This option provides real-time transmission statistics for each stream (16 streams on 1 Gbps ports and 4 streams on 10 Gbps ports) over the emulated bi-directional link (P1-P2) / (P2-P1). The statistics include Tx and Rx frame statistics for each port, Dropped Packets (due to Bandwidth Control), No. of Packets with Errors, Dropped Packets (due to Packet Loss), Duplicated Packets, and Reordered Packets for varying durations.

Screen Shot of IPNetSim Stream Statistics
(16 Streams on 1G ports)

Screen Shot of IPNetSim Stream Statistics
(4 Streams on 10G ports)

Screen Shot of IPNetSim Port Statistics  

Stream Throughput Graph

The real-time Throughput of each stream, plotted as rate against time, is displayed in the form of a line graph. All the streams (16 streams on 1G ports and 4 streams on 10G ports) throughput can be viewed together, or user can select or deselect each stream to view separately. Graphing is supported from 5 seconds up to 7 days.

Screen Shot of IPNetSim streams Graph
(4 streams on 10G ports)

Screen Shot of IPNetSim streams Graph
(16 streams on 1G ports)


Packet Impairments

GL's IPNetSim™ WAN emulator is 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.

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 of 60 million packets/sec.

IPNetSim™ has the capability to better model real-world impairments such as Packet Loss, Packet Reordering, Packet Duplication, and Packet Error Insertion with Periodic and Random options, which are briefly discussed below:

Bidirectional WAN link Emulation

Packet Loss Impairment

Screen shot of Packet Loss model configurations

Packet Loss can be introduced either as a rate as well as Manually. For both rate and manual, user can choose to drop a single packet or a burst of packets, at a time.

  • Rate: User can configure the Loss rate, and packets will be dropped at that rate. User can choose a periodic loss, where the packet drops will be regular and predictable, or random packet loss, where packets will be dropped randomly. For both periodic as well as random packet loss, the overall packet loss rate is maintained, but only the way the packets selected for dropping is changed

  • Manual Drop: This 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 loss, if active.

  • Single vs Burst Drop: In Single drop, only one packet will be dropped at a time. However, Real world Packet Loss is many times bursty in nature i.e. a bunch of consecutive packets are lost. This allows user to drop a burst of packets at a time instead of a single packet i.e. a bunch of consecutive packets are lost. To emulate such conditions, Burst Packet Loss can be configured

Packet Reordering

Screen shot of Packet Reorder model configurations

Packet reordering model includes Periodic and Random Packet Reordering options.  In Periodic option, the packets are reordered at constant specified rate. While in Random option, packets are randomized for reordering, but still maintain the specified Reorder rate.

Once a packet has been selected for reordering, it will be held for a certain amount of time before being reinserted into the stream. The delay can be configured in terms of time (milliseconds), or Packet offset (number of frames). During Packet offset delay, the reordered frame will be held until the configured offset frames are received, before being reinserted into the stream. The offset selected at run time will be a random value between the maximum and minimum defined value range.

The Packet Reordering model also includes Manual Packet Reorder option to reorder a packet instantaneously at run time. When selected, it will immediately reorder a single packet.

Packet Duplication

Screen shot of Packet Duplication model configurations

Packet Duplication model also includes Periodic and Random Packet Duplication options. In Periodic Duplication option, the packets are duplicated at specified rate periodically. In Random Duplication option, the selected packet is duplicated (based on the rate) randomly, but maintaining the duplication rate.

A single packet can be duplicated instantaneously at run time with Manual Packet Duplication option.

Packet Error Insertion

Screen shot of Packet Error Insertion model configurations

Packet Error Insertion model also includes Periodic and Random Packet Error Insertion options. In Periodic Error Insertion option, the start of frame and end of frame byte offsets specifies where exactly in the frame to inject errors. In the Random Error Insertion option, the packet will be randomly selected for error insertion (based on the rate), but the error insertion rate is maintained.

But in Manual Error Insertion option, error is introduced into a single packet at run time manually.

Command Line Interface (CLI)

IPNetSim™ also supports Command line Interface (CLI) to access all the functionalities remotely such as  using TCL (Tool Command Language) and MAPS™ CLI Client/Server architecture.

IPNetSim™ can be configured as server-side application and on the client side, the standard TCL shell (tclsh85.exe) with IPNetSim™ specific functionalities can be used to communicate with the MAPS™ CLI Server, execute scripts, read back responses etc.

  • Capability of remote operation, automation and multi-site connectivity using TCL client and MAPS™ CLI server.
  • Scripts for MAC, VLAN, MPLS, IP and UDP layers testing
  • Multiple IPNetSim™ can be controlled remotely from single client application via MAPS™ CLI server.
  • Includes ready-to-use scripts for IPNetSim™ Multi Stream (16 streams on 1G ports and 4 streams on 10G ports) testing

    Command line based TCL client

    Maps CLI Server

Buyer's Guide

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Item Description
IPN502 IPNetSim™ 1G – Multi-Stream - Rack System
IPN504 IPNetSim™ 10G – Multi-Stream - Rack System
IPN505 IPNetSim™ 1G Tablet (Multi-stream)


Related Hardware
IPN111 IPLinkSim™ WAN Link Emulator
(1 Gbps, 2 active ports)
IPN511 IPLinkSim™ WAN Link Emulator
(10/1 Gbps, 2 active ports)
IPNetSim™ Handheld Network Impairment Generator
IPNetSim™ Handheld Remote Option
PacketBroker™ - 1G
PacketBroker™ - 10G
 PXX107 PacketBroker™ - 40/100G


Multi-Stream UDP/TCP Traffic Generator and Analyzer - 1G (on PXE100) (up to 12 users)
Multi-Stream UDP/TCP Traffic Generator and Analyzer - 10G (on PXG100, PXG101) (up to 16 users)

PXG100 PacketExpert 10G™
PXX100 PacketExpert™ 40/100G
PXG101 PacketExpert 10G™ with Tablet
PacketExpert™ - SA (4 ports) 
PacketExpert™ - SA (12 Ports)
PacketExpert™ - SA (24 Ports)
Wire speed Record /Playback - 1G
Wire speed Record /Playback - 10G
PXX105 PacketExpert™ Wirespeed Record / Playback 40/100G
ExpertSAM™ - 1G
ExpertSAM™ - 10G
PXX106 ExpertSAM™ - 40/100G
  Related Software
ETH100 PacketCheck™
PKS100 PacketGen™ (includes PacketScan™)
PKV100 PacketScan™ (Online and Offline)
PKB100 RTP ToolBox™
MAPS™ SIP Emulator 
MAPS™ SIP Conformance Test Suite (Test Scripts)
MAPS™ MEGACO Conformance Test Suite (Test Scripts)
MAPS – MGCP Protocol Emulation with Conformance Test Suite


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