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Cisco Services & Technologies

How to Fix Cisco VPN Client Error 51 – Unable to…

Apple Mac OS X users are frequently faced with the Cisco VPN Client Error 51 - Unable to Communicate with the VPN Subsystem as shown in the screenshot below: When this error is produced, users wil…

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…

Windows Servers

Windows Server 2016 Licensing Made Easy – Underst…

This article describes the new Windows Server 2016 Licensing model (per-core licensing) Microsoft has implemented for its new server-based operating system. While the Windows Server 2012 Licensing mo…

Palo Alto Networks

How to Manually Download, Import & Install PAN-OS…

This article provides comprehensive guidance on the manual processes involved in downloading, uploading, and installing (import) any PAN-OS version on a Palo Alto Firewall. It details the steps for s…

ICMP Protocol

ICMP Protocol - Part 7: Time Exceeded Message Ana…

The ICMP - Time Exceeded message is one which is usually created by gateways or routers. In order to fully understand this ICMP message, you must be familiar with the IP header within a packet. Our r…

Cisco Routers

How and Why You Should Verify IOS Images On Cisco…

Chances are we’ve all needed to upgrade our Cisco’s device IOS software at some point. While upgrading the IOS software on a Cisco device is considered to be a fairly simple process, it can turn out…

Network Protocols

IPSec - Internet Protocol Security

IPSec is one of the new buzz words these days in the networking security area. It's becoming very popular and also a standard in most operating systems. Windows 2000 fully supports IPSec and that's m…

Web Application Vulnerability Scanners

What is OWASP? Open Web Application Security Pro…

With nearly every business sector relying on the internet and digital tools to function, it is no surprise that cybersecurity is the second-fastest growing industry. Hackers don’t care how large or s…

Cisco Wireless

Cisco Aironet 1242AG /1240 - Multiple SSID & 80…

This article explains how the Cisco 1240 series access point can be setup to provide support for multiple SSID, each SSID assigned to a separate VLAN. This type of configuration is id…

Network Address Translation - NAT

Dynamic NAT - Part 2

Our previous article, Dynamic NAT - Part 1, covered the basic idea of Dynamic Network Address Translation. We are now going to take a closer look at the packets as they traverse the Dynamic NAT enabl…

OpManager - Network Monitoring & Management

Ensuring Enterprise Network Readiness for Mobile…

Demands for Enterprise networks to properly support mobile users is on a continuous rise making it more than ever necessary for IT departments to provide high-quality services to its users. This arti…

Web Application Vulnerability Scanners

How to Test for SQL Injection Attacks & Vulnerabi…

SQL injection vulnerabilities have held the first spot on the OWASP Top 10 list for quite some time. This is due to the fact that they are both still widespread and can lead to very serious consequen…