Packet tester

In NIC drivers. You can find more details about SIP Tester's performance here. The SIP Tester is able to run as Windows Service - run in background with web interface, start automatically with Windows. To set up it as Windows Service, run StarTrinity.SIPTester.Service.install.bat, to uninstall service - StarTrinity.SIPTester.Service.uninstall.bat Main Window The main window is divided into 3 sections: simulation, reports and status: Simulation section is divided into following tabs: Registrations (UAC) - here you can configure SIP Tester to register at SIP server(s) as client. Registration is needed to receive incoming calls by SIP Tester Registrations (UAS) - here you configure how SIP Tester simulates IP PBX register server: edit list of extensions - users and passwords Outgoing calls simulation - configure script for simulated outgoing calls Incoming calls handling - configure script for incoming calls Manual tests - here you can manually send DTMF to current SIP calls, send REFER or start fax operation Impairments generation - allows you to simulate RTP packet loss and/or jitter, also to terminate SIP Tester and simulate hang calls Stepwise testing - is used to run tests with increasing number of concurrent calls Reports section is divided into following tabs: Current calls - SIP info - displays SIP information about current calls: SIP Call ID, Status Code, Answer Delay etc. Current calls - RTP info - displays RTP information about current calls: jitter, packet loss, G.107 MOS etc. Calls history (CDR) - displays both current and completed calls Lowest quality calls - shows SIP calls ordered by various quality indicators, e.g. calls with largest packet loss Reports/Statistics - shows summary statistics for measured SIP calls, e.g. max. answer delay, mean jitter etc. Performance Chart - visual representation of quality indicators on 2D chart, e.g. jitter vs. number of channels Log - system and

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That includes the port number, provided unique test id and the test result. These are then broadcast to all listening web servers. The web server has the option, after a timeout, to consider ip/port combination in error separate from receiving a result from the distributor. This decoupling is intentional in case the distributor or other backend services encounter a problem during the test. As implemented this piece cannot scale. But observation of the processes under load shows that it can handle a significant number of web servers and children connected to it with reasonable resource utilization. It is helped immensely by not having to hold the state of any test, the data just passes through. If necessary this could be replaced with a distributed pub/sub system such as Redis or Simple Queue Service. Tester The tester runs on a separate server from the web server by design. This ensures that connections made to your machine do not come from netbymatt.com, where your firewall recognizes that you have an ongoing connection. Some firewalls have been observed to respond differently to unsolicited packets received from an ip address that has other connections active. By using a different server we eliminate this problem. In practice several testers run on one server. The number of testers that one server can support is limited more by memory than CPU because each test run requires significant memory to track the TCP connection progress. Each tester can run multiple tests simultaneously, currently set in the low hundreds. Upon loading, each tester registers itself with the Test Distributor. This is done over TCP so if a tester unexpectedly goes offline it can be detected fairly quickly and removed from the Test Distributor pool. A tester that has gone offline is the typical cause for an intermittent port marked as "error" although after tuning the server sizes and tester counts this is now rare. The tester receives a test from the Test Distributor and puts it in a queue waiting for one of its hundreds of available testers in its pool to become free. When the tester becomes free it receives the test request and runs the test on the ip address and port combination specified. On a stealth port, three connection attempts are made over the course of 2 seconds. Once the state of the port has been determined (open, closed, stealth) the test result is sent back to the Test Distributor. Raw sockets are used to send a TCP SYN packet to the ip address being tested. This is deliberate. If Node.js's built in TCP methods were used and an open port is found a complete connection would be made. By using raw sockets we have control