Last Change: 2018-09-07, 16:50
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network-test − check the network and test if everything is fine
network-test
The network-test program will test your system’s network configuration using basic tests and providing both information (INFO), warnings (WARN) and possible errors (ERR) by checking:
* Interface status, number of transmitted packets and error rates.
* Availability of configured routers, including the default router.
* Proper host resolution, testing DNS resolution against a known host.
* Proper network connectivity, testing reachability of remote hosts using ICMP and simulating a web connections to a remote web server (the web server used for the tests can be configured through the environment, see below)
The script does not need special privileges to run as it does not do any system change.
The program will, by default, check www.debian.org and its associated web server. If you want to use a different check host you can setup the environment as follows:
CHECK_HOST
The name of a host to use when testing DNS resolution.
CHECK_IP_ADRESS
The IP address of the host defined in CHECK_HOST
CHECK_WEB_HOST
The web server to use for testing purposes when testing network connectivity.
CHECK_WEB_PORT
The web server port of server CHECK_WEB_HOST that will be used for testing.
The program will exit with error (1) if any of the network checks fail.
This program does not have super cow powers so it is unable to fix the errors by itself. It is also unable to detect if the network is failing due to a local firewall policy been in place so make sure you check your system logs with dmesg(1)
network-test was written by Javier Fernandez-Sanguino for the Debian GNU/Linux distribution.
Copyright (C) 2005,2006 Javier Fernandez-Sanguino <jfs AT debian DOT org>.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.
On Debian systems, a copy of the GNU General Public License may be found in /usr/share/common-licenses/GPL.