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Linux - Unix

Linux BIND DNS - Part 5: Configure Secondary (Sla…

Setting up a Secondary (or Slave) DNS sever is much easier than you might think. All the hard work is done when you setup the Master DNS server by creating your database zone files and configuring th…

Cisco Services & Technologies

Fix Cisco VPN Client Break After Windows 10 Anniv…

Windows 10 latest update 1607 code named Anniversary update promises to introduce a number of significant enhancements including breaking your trustworthy Cisco IPSec VPN client. After installing the…

Windows Servers

Windows 2003 DNS Server Installation & Configurat…

DNS is used for translating host names to IP addresses and the reverse, for both private and public networks (i.e.: the Internet). DNS does this by using records stored in its database. On the Intern…

Cisco Routers

How To Configure DHCP Server On A Cisco Router

DHCP (Dynamic Host Configuration Protocol) is the protocol used by network devices (such as PCs, network printers, etc) to automatically obtain correct network parameters so they can access network a…

Network Cabling

10Base-T/2/5/F/35 - Ethernet

The 10Base-T UTP Ethernet and 10Base-2 Coax Ethernet were very popular in the early to mid 1990's when 100 Mbps network cards and hubs/switches were very expensive. Today's prices have dropped so muc…

Cisco Switches

Installation of a Cisco Catalyst 4507R-E Layer 3…

Driven by our thirst for technical material and experience, we thought it would be a great idea to start presenting various installations of Cisco equipment around the globe, especially equipment tha…

Network Protocol Analyzers

Advanced Network Protocol Analyzer Review: Colaso…

Firewall.cx has covered Colasoft Capsa several times in the past, but its constant improvements make it well worth revisiting. Since the last review, the version has bumped from 7.6.1 to 11.1.2+, kee…

SASE & SD-WAN Networks

Key Features of a True Cloud-Native SASE Service…

Secure Access Service Edge (SASE) is an architecture widely regarded as the future of enterprise networking and security. In previous articles we talked about the benefits of a converged, cloud-deliv…

Cisco CallManager-CCME

Cisco CallManager Express CME v8.8 & v9.0 GUI Web…

Cisco's CallManager Express GUI interface is an important part of the CallManager Express product as it provides the ability to administer CME via a web browser. Generally, the CME GUI interface is e…

Cisco Services & Technologies

Dynamic Multipoint VPN (DMVPN) Deployment Models…

Following our successful article Understanding Cisco Dynamic Multipoint VPN - DMVPN, mGRE, NHRP, which serves as a brief introduction to the DMVPN concept and technologies used to achieve the flexibi…

VLAN Networks

VLAN InterSwitch Link (ISL) Protocol Analysis

Deciding whether to use ISL or IEEE 802.1q to power your trunk links can be quite confusing if you cannot identify the advantages and disadvantages of each protocol within your network. This article…

Virtualization & VM Backup

8 Critical Features to Have in a VM Backup Soluti…

Businesses that rely on virtual machines for their day-to-day operations should think twice about securing their infrastructure. Modern use of virtual machines stems from the benefits of virtualizati…