SysAdmin.MD

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A VPN (virtual private network) is a private, encrypted network that traverses a public network (such Internet). This is a way of giving remote users access to local network resources as if they were themselves local.

OpenVPN is a open-source VPN software that allows creating encrypted tunnels between computers. The secure authentication and encryption functions relies on OpenSSL library that implements the basic cryptographic functions.

This post shows how to setup a VPN server with certificate-based authentication using OpenVPN and OpenSSL. Also, in tutorial will be shown how to connect to this VPN server from Linux and Windows machines.
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Articles networking openssl openvpn server vpn

Monitoring Linux and Windows hosts with SNMP and Cacti

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SNMP is a communication specification that defines how management information is exchanged between network management applications and management agents.

Cacti is a resource monitoring software. It uses RRDtool to store data and the data is used create graphs. It also comes with fast poller to collect data from different resources simultaneously and has many user management features. The interface and management is very userfriendly that even a layman can get it working with less effort.

This article is about how to monitor Linux and Windows hosts with SNMP (2c version) and Cacti.
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Articles cacti guide linux monitoring networking snmp windows