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CT521-400 LANforge-WiFIRE

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The CT521-400 wireless traffic generator is an excellent choice for testing Access Points and other WiFi networks. The CT521-400 uses a modified Wireless driver for WiFi NICs based on the Atheros chipset. It can support up to 400 Virtual Stations(Up to 200 per radio). Each of the Virtual Stations has its own IP address, IP port space, MAC address and routing table. The Virtual Stations can be assigned to communicate to a particular Access Point, use a particular ESSID and Nickname, and have a WEP (64 or 128bit) or WPA key assigned. There are two WiFi radios per CT521-400 and multiple CT521-400 systems can be clustered together for even more realistic radio interference patterns and increased traffic generation capability. Each radio can be configured idependently of the other, and supports 802.11 a, b, g or n mode. The radio's channel, frequency, sensitivity, rate, RTS and Tx-Power can also be configured.

All virtual stations on the same radio must be on the same frequency, but as long as the protocol supports that fequency, the multiple protocols can be used concurrently. For instance, if the radio is configured for a 2.4Ghz channel, the stations can be b, g, or n. If the radio is on a 5Ghz channel, the stations can be a or n. The bandwidth can be configured for all protocols. For 802.11n, configuring the MCS rates also determines the number of streams (1x1, 2x2, 3x3 etc).

The Virtual Stations may be configured with all of the virtual interfaces on the same subnet, or different subnets, depending on the testing requirements. When used with something like VoIP, it allows all of the VoIP calls to use the standard IP ports (with one call per virtual interface).

The CT521-400 has one small and quiet fan and 6 antenna. It will fit into a small travel bag or briefcase for easy portability. No additional hardware or software is required, but it is suggested that you manage the system using the LANforge-GUI on a separate machine. The CT521-400 can also be managed over a serial console in text mode or through directly connected VGA monitor and keyboard.

  1. Connect Management ethernet port to Management network or management PC. If connecting directly to a PC, an ethernet cross-over cable should be used.
  2. Connect eth1 wired Ethernet interface to wired Ethernet interface on the AP or network under test. This usually is considered the 'server' side of the network.
  3. The Client side of the network will be the Virtual Stations configured on the CT521-400 WiFi NIC.
  4. Connect power brick to standard US or European AC power source.
  5. Install the LANforge-GUI on a separate management PC or Laptop. Windows and Linux GUIs are supported: Select the correct one from the CDROM or Candela Technologies Download page and install it.
  6. The CT521-400 should now boot. If DHCP is enabled on the Management network, the CT521-400 will automatically acquire an IP address. If DHCP is not available, the IP address will be set to 192.168.1.101 by the LANforge scripts.
  7. Start the LANforge-GUI on the management PC and click the 'Discover' button. It should find the CT521-400 appliance and add the IP address to the drop-down box in the Connect widget. Press 'Connect' and you will be connected to the CT520.
  8. Select the Port Mgr tab in the GUI. Double-click on the device called 'wiphy0'. This is the Radio device, and should be configured for the correct, channel, country-code, etc. Next, select one or more of the Virtual Station interfaces and click 'Modify'. Enter the correct IP address information, ESSID and WEP or WPA key (if Enabled). After applying these changes, the Virtual Station interface should associate with the AP and be ready to send traffic. You may create up to 400 Virtual Station interfaces per CT521-400 with the 'Create' button.
  9. Once the interfaces are configured correctly, you can click on the Layer 3, VOIP/RTP and other LANforge-FIRE related GUI tabs and configure/modify/start/stop particular traffic patterns that utilize the virtual stations and wired ethernet interface. In most cases, you will want one of the FIRE endpoints to be on the wired interface and the other to be on the WiFi Virtual Station interface. It is also valid to generate traffic between two Virtual Station interfaces.
  10. Any GUI modifications take place immediately after you click 'Submit'.

  • Supports real-world protocols:
    • Layer 2: Raw-Ethernet.
    • 802.1Q VLANs.
    • PPPoE: Integrated PPPoE support.
    • Layer 3: IPv4, IPv6, UDP/IP, IGMP Multicast UDP, TCP/IP.
    • Layer 4: FTP, HTTP, HTTPS, TFTP, SFTP, SCP
    • 802.11a/b/g/n Wireless Station (up to 128 per machine).
    • Layer 4: TELNET, PING, DNS, SMTP, NMAP (via add-on script).
    • File-IO: NFSv3, NFSv4, CIFS, iSCSI.
    • Supports up to 1000 concurrent TCP connections with base license package, and up to 30,000 connection on high-end hardware with additional license purchase.
    • The CT521-400 is able to generate 170Mbps or more, depending on the protocols mix, wireless mode and environment, and speed of the network under test. Supports at least 20 VoIP (SIP, RTP) calls if appropriate licenses are purchased. More powerful systems are also available.
    • Supports over 250 UDP and TCP connections on a single machine.
    • Supports real-world compliance with ARP protocol.
    • Supports ToS (QoS) settings for TCP/IP and UDP/IP connections.
    • Uses publicly available Linux, Windows and Solaris networking stack for increased standards compliance.
    • Utilizes libcurl for FTP, HTTP and HTTPS (SSL), TFTP and SCP protocols.
    • Supports file system test endpoints (NFS, CIFS, and iSCSI file systems, too!). File system mounts can use the virtual interface feature for advanced testing of file server applications.
    • Supports custom and command-line programs, like telnet, SMTP, and ping.
    • Comprehensive traffic reports include: Packet Transmit rate, Packet Receive rate, Packet Receive Drop %, Transmit Bytes, Receive Bytes, Latency, various ethernet driver level counters, and much more.
    • Supports generation of reports that are ready to be imported into your favorite spread-sheet.
    • Allows packet sniffing and network protocol decoding with the integrated Wireshark protocol sniffer.
    • GUI runs as Java application on Linux, Solaris and Microsoft Operating Systems (among others).
    • GUI can run remotely, even over low-bandwidth links to accommodate the needs of the users.
    • Central management application can manage multiple units, tests, and testers simultaneously.
    • Includes easy built-in scripting for iterating through rates and packet sizes, with automated reporting. Also supports scriptable command line interface (telnet) which can be used to automate test scenarios. Perl libraries and example scripts are provided!
    • Comprehensive management information detailing all aspects of the LANforge system including processor statistics, test cases, and ethernet port statistics.
    • Automatic discovery of LANforge data generators simplifies configuration of LANforge test equipment.
    • LANforge traffic generation/management software is supported on Linux, Solaris and MS Windows.

  • High-End Appliance with quiet fan.
  • Operating System: Fedora Linux with customized 64-bit Linux kernel.
  • Two 1Gbps Ethernet ports, room for two wifi NICs.
  • Two Atheros chipset 802.11a/b/g/n Wireless NICs with three external antenna each. Supports up to 64 virtual stations
  • Intel M-620 Core-i7 2.6 GHz processor.
  • RJ45 Serial console (38400 8 N 1) for console management & initial configuration.
  • VGA, USB ports for desktop usage.
  • 8 GB RAM.
  • 40 GB Solid State Hard Drive.
  • Larger storage drive and compact-flash available.
  • 9-30v 4AMP external power supply (brick).
  • Weight: 8 lbs
  • Dimensions: 11 x 8 x 2.6 inches Metric: 277 x 194 x 67 mm.
  • Operating Temperature: -20 ~ 55°C.
  • Certification: CE Emission, FCC Class A, RoHS Compliant.

Unless otherwise noted, these features usually cost extra:

  • WanPaths (LANforge-ICE feature set)
  • Virtual Interfaces: MAC-VLANs, 802.1Q VLANs, WiFi stations, etc
  • FIRE Connections: Base FIRE license includes 1000 active connections.
  • LANforge-ICE Network Emulation.
  • VOIP: Each concurrent call requires a license.
  • Armageddon: Each pair of ports requires a license.

LANforge-GUI Virtual Interface Configuration

LANforge-GUI Stateful Traffic

LANforge-GUI Stateful Traffic Create/Modify

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