Parallel port tester

Connect to 9-pin DTE (computer) Cable image created by CableEye ® cable tester 4 - DB25 to DB9 Adapter Next Cable | Previous Cable || Next Topic Signals on the DB25 DTE side are directly mapped to the DB9 assignments for a DTE device. Use this to adapt a 25-pin COM connector on the back of a computer to mate with a 9-pin serial DCE device, such as a 9-pin serial mouse or modem. This adapter may also be in the form of a cable. 80K Left Side: Connect to 25-pin DTE (computer) Right Side: Connect to 9-pin DCE (modem) Cable image created by CableEye ® cable tester 5 - DB25 to DB9 Adapter (pin 1 connected to shield) Next Cable | Previous Cable || Next Topic This adapter has the same wiring as the previous cable (#4) except that pin 1 is wired to the connector shell (shield). Note that the cable's shield is usually a foil blanket surrounding all conductors running the length of the cable and joining the connector shells. Pin 1 of the EIA232 specification, called out as "shield", may be separate from the earth ground usually associated with the connector shells. 84K Left Side: Connect to 25-pin DTE (computer) Right Side: Connect to 9-pin DCE (modem) Cable image created by CableEye ® cable tester 6 - DB9 to DB25 Adapter Next Cable | Previous Cable || Next Topic Signals on the DB9 DTE side are directly mapped to the DB25 assignments for a DTE device. Use this to adapt a 9-pin COM connector on the back of a computer to mate with a 25-pin serial DCE devices, such as a modem. This adapter may also be in the form of a cable. 80K Left Side: Connect to 9-pin DTE (computer) Right Side: Connect to 25-pin DCE (modem) Cable image created by CableEye ® cable tester 7 - DB25 All-Line Direct Extension Next Cable | Previous Cable || Next Topic This shows a 25-pin DTE-to-DCE serial cable that would result if the EIA232 standard were strictly followed. All 25 pins plus shield are directly extended from DB25 Female to DB25 Male. There are no crossovers or self-connects present. Use this cable to connect modems, printers, or any serial device that uses a DB25 connector to a PC's serial port. This cable may also serve as an extension cable to increase the distance between computer and serial device. Caution: do not exceed 25 feet separation between devices without a signal booster! Caution: the male end of this cable (right) also fits a PC's parallel printer port. You may use this cable to extend the length of a printer cable, but DO NOT attach a serial device to the computer's parallel port. Doing so may cause damage to both devices. 84K Left Side: Connect to 25-pin DTE (computer) Right Side: Connect to 25-pin DCE (modem) Cable image created by CableEye ® cable tester 8 - DB25 Loopback Connector Next Cable | Previous Cable || Next Topic A loopback

'System Stability Tester 1.1.1', and 'Kestrel GX 1.1.0.5' by Brandon Dimmel on February, 8 2011 at 08:02AM EST System Stability Tester 1.1.1 System Stability Tester tries to test the system's stability by calculating up to 128 millions of Pi (3.14159265) digits. It supports multiple calculation algorithms. For the moment only two have been implemented. The ... Quadratic Convergence of Borwein and Gauss-Legendre, the algorithm SuperPi uses. The testing process includes the creation of two or more threads. After each step of the calculation, the results of all the threads are compared. Any differences between them are reported. Kestrel GX 1.1.0.5 Kestrel GX is a free photo ... (view more) 'Losethos Operating System', and 'Simple Port Tester' by Brandon Dimmel on December, 16 2009 at 08:12AM EST Losethos Operating System Losethos is an interesting and experimental operating system (OS) that some call a really 'souped-up' Commodore 64. It's x86_64, preemptive multitasking, multicore, open source, and public domain. Losethos includes a Live ... CD image so you can take a test drive before you install. If you're from the days of the beloved Commodore 64 and a self-proclaimed geek, you'll be completely geeked out by the author's demonstration video (requires Media Player browser plugin to play). It's geeky to the 500th factorial! Simple Port Tester Simple Port Tester ... (view more) 'Port Forwarding Tester', and '15 Must-Have Firefox Tricks' by Bob Helmer on January, 4 2008 at 08:01AM EST PORT FORWARDING TESTER The port forwarding tester is a utility used to identify your external IP address and detect open ports on your connection. This tool is useful for finding out if your port forwarding is set up correctly or if your server ... applications are being blocked by a firewall. It is important to note that some ports, such as port 25, are often blocked at the ISP level in an attempt to prevent malicious activity. 15 Must-Have Firefox Tricks How to tweak, hack and bend Firefox to your will. (view more)

Timeout command. This will continue for 180 seconds, and if there is still no response, a new dead timer is started based on the configured radius-server deadtime command. VRF-Aware RADIUS Automated Testing The RADIUS automated tester function works at a server-level configuration. There is no group associated with the function. A VRF is a group level configuration. All the information related to the VRF and the source-interface configurations is maintained in a group structure. If information regarding the VRF and the source-interface configurations is available in the global source-interface, automated tester can access it. If the information is not available at the global source-interface or the default VRF, automated tester marks the server as a dead server. Starting with Cisco IOS XE Bengaluru 17.4.1, you can configure automated tester to be VRF aware. You can use the vrf keyword with the automate-tester command to enable automate-tester for a non-default VRF. Note For VRF aware automate-tester to work, you have to configure global config ipv4/ipv6 source interface interface-name vrf vrf-name command. How to Configure RADIUS Server Load Balancing Enabling Load Balancing for a Named RADIUS Server Group Procedure Command or Action Purpose Step 1 enable Example: Device> enable Enables privileged EXEC mode. Enter your password, if prompted. Step 2 configure terminal Example: Device# configure terminal Enters global configuration mode. Step 3 aaa group server radius group-name Example: Device(config)# aaa group server radius rad-sg Enters server group configuration mode. Step 4 server ip-address [auth-port port-number] [acct-port port-number] Example: Device(config-sg-radius)# server 192.0.2.238 auth-port

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

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61 69 6C 75 72 65 [failure]00:06:07: RADIUS(00000000): Received from id 1645/100:06:07: RADIUS/DECODE: Reply-Message fragments, 22, total 22 bytes Enabling VRF Aware RADIUS Automated Testing To enable RADIUS automated testing for a non-default VRF, perform the following procedure: Procedure Command or Action Purpose Step 1 enable Example: Device>enable Enables privileged EXEC mode. Enter your password, if prompted. Step 2 configure terminal Example: Device# configure terminal Enters global configuration mode. Step 3 radius server name Example: Device(config)# radius server myserver Specifies the name of the RADIUS server configuration and enters RADIUS server configuration mode. Step 4 address { ipv4| ipv6} { ip-address| host-name} auth-port port-numer acct-port port-number Example: Device(config-radius-server)# address ipv4 192.0.2.1 auth-port 1812 acct-port 1813 Configures the IPv4 address for the RADIUS server accounting and authentication parameters. Step 5 automate-tester username user [ ignore-auth-port] [ ignore-acct-port ] [ idle-time minutes] vrf vrf-name or automate-tester username user probe-on vrf vrf-name Example: Device(config-radius-server)# automate-tester username user1 idle-time 2 vrf VRF1 or Device(config-radius-server)# automate-tester username user1 probe-on vrf VRF1 Enables RADIUS automated testing for a non-default VRF. Step 6 end Example: Device(config-radius-server)# end Exits RADIUS server configuration mode and returns to privileged EXEC mode. Configuration Examples for RADIUS Server Load Balancing Example: Enabling Load Balancing for a Named RADIUS Server Group The following examples show load balancing enabled for a named RADIUS server group. These examples are shown in three parts: the current configuration of the RADIUS command output, debug output, and authentication, authorization, and accounting (AAA) server status information. The following sample