12-19-2014
Quote:
Originally Posted by
xabbu
Budrys,
I need more infomations for that.
Where are your users? Local in your company? Will you send mails from locally users to external users?
The problem is not the mailsystem the problem is your understanding how all this works together.
I'll try to help you but you need to know what you exactly want.
For a correct setup of any mailsystem the DNS is mandantory If you are unable to set the DNS correct your can't use the mailsystem for external use.
And you must know your network infrastructure.
- Are firewalls between you and the internet?
- Will your IP be natted thouth the internet?
- How shuld the incoming mails routed to?
Regards,
xabbu
As I told You I have VM on univerity network.
Users are on my machine server.
Could we configure that mail system only for internal use?
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LEARN ABOUT DEBIAN
network-test
network-test(1) ifupdown-extra network-test(1)
NAME
network-test - check the network and test if everything is fine
SYNOPSIS
network-test
DESCRIPTION
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) based on the results of these tests. It will check and report on:
* Status of the network interfaces of the system including: link status,
IP addressing and number of transmitted packets and error rates.
* Accessibility to configured routes to external networks,
including the default network route, checking the routers configured
to give access to the network
* 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 program does not need special privileges to run as it does not do any system change.
However, the behaviour of the program when running as an unprivileged user is not the same as running as system administrator (i.e. root).
If the program is run as system administrator it will try to run some tools that are only available to it to speed up some of the tests.
The program relies on the use of ip, netstat, ifconfig, arp and (when running as root) ethtool or mii-tool, to obtain information about the
system's networking configuration (status of available interfaces and configured network routes). It also uses ping, host and nc (netcat)
to do tests of the network connectivity and ensure that the host can connect to the Internet.
ENVIRONMENT
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.
EXIT STATUS
The program will exit with error (1) if any of the network checks fail.
BUGS
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) to detect if some of the active
tests are being dropped due to your local firewall.
Other known issues that might make the program not work reliable are:
* IPv6: The program does not yet explicitly handle IPv6 only hosts, some of the tests might be biased towards IPv4 and might fail in
IPv6 environments.
* Proxies: The program does not check network connectivity for hosts that connect through the Internet using a proxy gateway for
services. The program might report issues in hosts using proxies even when these might connect to the Internet properly through
proxied services.
* Firewall environments: some of the tests rely on direct connectivity to external hosts, which are tested using ICMP queries
(through the use of ping. These tests might fail in hosts installed in networking environments with firewalls that block outbound
ICMP communication.
SEE ALSO
ip (8), netstat (8), ifconfig (8), ethtool (8), mii-tool (8), ping (8), nc (1) and host (1).
AUTHOR
network-test was written by Javier Fernandez-Sanguino for the Debian GNU/Linux distribution.
COPYRIGHT AND LICENCE
Copyright (C) 2005-2011 Javier Fernandez-Sanguino <jfs@debian.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.
ifupdown-extra August 23 2011 network-test(1)