2. Guidelines For Secure Network Administration – part 1


Installing networks and making sure they’re able to communicate and talk to each other is the end of it for a network administrator. There are some guidelines that many admins neglect, which exposes the network and makes them vulnerable to attacks. In this section I’ll try to cover some of these guidelines. These guideline can be used as a general security guidelines and not just network security.

Rule-based Management

Firewalls, proxies, routers, IDPSs (IDS/IPS), antivirus, and more are example of rule-based security devices. Rule-based managements is a method of controlling the network activity via the use of rule-based devices. Each rule can either be explicit allow or deny. Continue reading

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1. Network Security – part 2


1.1.        Security functions of network devices – Continued

VPN Concentrator

VPN (Virtual Private Network) will be discussed in the future as a chapter of its own due to its importance in the network security world.

VPN concentrators are sometimes known by many other names such as VPN servers, VPN firewalls, VPN RAS (VPN Remote Access Servers), VPN Proxies, etc.

VPN concentrators allows for high availability, high scalability and performance for VPN connections. They’re hardware appliances designed to facilitate a large number of multiple simultaneous VPN connections, usually hundreds or even in some implementations thousands of simultaneous VPN connections. Continue reading

1. Network Security – Part 1


1.1.        Security functions of network devices

Firewalls

Firewalls are security devices designed to control traffic and protect networks from each other they’re usually applied to protect high trust networks from low trust ones or to stop networks part of the same organisation but from different departments. They can be either hardware or software.

There are four different types of firewalls:

Packet filter Firewalls – uses the packet header to do basic traffic filtering usually based of the source and destination address, port numbers and protocols. They operate in the network and transport layers of the OSI model. Continue reading