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Full Discussion: SNMP installation
Special Forums UNIX and Linux Applications Infrastructure Monitoring SNMP installation Post 302460563 by jim mcnamara on Thursday 7th of October 2010 04:35:18 AM
Old 10-07-2010
Obvious question: once you get a basic feel for this what are you expected to do with
it?

This gives you everything you need to know:
http://oreilly.com/catalog/9780596008406/

In general there is a book from oreilly with a distinct animal on the cover for almost all of the basic stuff for computer and network technology. I commend that fact to your immediate attention.

SNMP provides a means of monitoring network devices through a central manager.
It is a protocol, because it defines "who" gets to talk about what, and how the talk is formatted and transferred.

Overview:
Simple Network Management Protocol - Wikipedia, the free encyclopedia

SNMP trap is asynchronous, that is, it creates a message on its own. The message is created when there is a problem with a network device.

In order to undertand it, you need to understand UDP, TCP/IP, plus what your network looks like, so-called network topology.

The basic idea is:
1. there is a database of device information - MIB
2. a small program runs on each network device - an agent
3. A manager program runs on a computer - the NMS. This coordinates information derived from each agent.

Network devices are things like routers, switches, and so on.
Last edited by jim mcnamara; 10-07-2010 at 05:43 AM..
 

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LEARN ABOUT PHP

systemd-networkd.service

SYSTEMD-NETWORKD.SERVICE(8)				     systemd-networkd.service				       SYSTEMD-NETWORKD.SERVICE(8)

NAME

       systemd-networkd.service, systemd-networkd - Network manager

SYNOPSIS

       systemd-networkd.service

       /lib/systemd/systemd-networkd

DESCRIPTION

       systemd-networkd is a system service that manages networks. It detects and configures network devices as they appear, as well as creating
       virtual network devices.

       To configure low-level link settings independently of networks, see systemd.link(5).

       systemd-networkd will create network devices based on the configuration in systemd.netdev(5) files, respecting the [Match] sections in
       those files.

       systemd-networkd will manage network addresses and routes for any link for which it finds a .network file with an appropriate [Match]
       section, see systemd.network(5). For those links, it will flush existing network addresses and routes when bringing up the device. Any
       links not matched by one of the .network files will be ignored. It is also possible to explicitly tell systemd-networkd to ignore a link by
       using Unmanaged=yes option, see systemd.network(5).

       When systemd-networkd exits, it generally leaves existing network devices and configuration intact. This makes it possible to transition
       from the initrams and to restart the service without breaking connectivity. This also means that when configuration is updated and
       systemd-networkd is restarted, netdev interfaces for which configuration was removed will not be dropped, and may need to be cleaned up
       manually.

CONFIGURATION FILES

       The configuration files are read from the files located in the system network directory /lib/systemd/network, the volatile runtime network
       directory /run/systemd/network and the local administration network directory /etc/systemd/network.

       Networks are configured in .network files, see systemd.network(5), and virtual network devices are configured in .netdev files, see
       systemd.netdev(5).

SEE ALSO

       systemd(1), systemd.link(5), systemd.network(5), systemd.netdev(5), systemd-networkd-wait-online.service(8)

systemd 237													       SYSTEMD-NETWORKD.SERVICE(8)
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