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Cisco Routers
Hosting your own webserver or email server would normaly require a static IP address from your ISP. This ensures that your services are always reachable using the same IP address or domain name. If…
Cisco Switches
This article covers basic and advanced configuration of Cisco Catalyst Layer-3 switches such as the Cisco Catalyst 3560G, 3560E, 3560-X, 3750, 3750E, 3750-X, 3850, 4500, 6500 , 9300, 9400 series, and…
Web Application Vulnerability Scanners
Part two of our Cross-site scripting (XSS) series shows how easy it is to create & execute a XSS attack, helping readers & network security engineers understand how XSS attacks work and how t…
Cisco Switches
It's no news that we here at Firewall.cx enjoy writing about our installations of Cisco equipment and especially devices that we don’t get to see and play with every day. Today we cover the installat…
Routing
Link State routing protocols do not view networks in terms of adjacent routers and hop counts, but they build a comprehensive view of the overall network which fully describes the all possible routes…
Routing
We all understand that TCP/IP, IPX-SPX are protocols which are used in a Local Area Network (LAN) so computers can communicate between with each other and with other computers on the Internet. Chanc…
Windows Servers
Windows 2003 Group Policies allow the administrators to efficiently manage a group of people accessing a resource. Group policies can be used to control both the users and the computers. They give b…
Cisco Switches
Our previous article shows how to perform a password recovery on the Cisco Catalyst switches. This article will now explain how to disable or enable the Cisco password recovery service allowing netwo…
ICMP Protocol
The ICMP - Source Quench message is one that can be generated by either a gateway or host. You won't see any such message pop up on your workstation screen unless you're working on a gateway which wi…
Network Cabling
In this article, we'll talk about Fiber optic cables and how it has changed the design and implementation of network infrastructures, providing high Gigabit speeds, increased security, flexibility an…
SASE & SD-WAN Networks
This article explores the need for Secure Access Service Edge (SASE) in today’s organizations. We show how one of the most advanced SASE platforms available, combines VPN and VPN and SD-WAN capabilit…
Cisco Routers
When working with Cisco equipment that has multiple ip interfaces, a common problem engineers are faced with is trying to successfully tftp to or from the Cisco device. This issue is usually encounte…

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