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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 and 4500 series, and extends to include the configuration of additional features consider...
This article aims to explain the configuration required for a Cisco 880W series router (e.g Cisco 887W, Cisco 886W, Cisco 881W, Cisco 888W, etc), in order to setup the integrated Cisco access point with multiple encrypted SSIDs, each SSID belonging to ...
GRE TUNNELS are very common amongst VPN implementations thanks to their simplicity and ease of configuration. With broadcasting and multicasting support, as opposed to pure IPSec VPNs, they tend to be the number one engineers' choice, especially when r...
Cisco is well known for its routers and switches. I must admit they are very good quality products and once they are up and running, you can pretty much forget about them because they rarely fail. We are going to focus on routers here since that's th...
Introduction One of the greatest perhaps features of Cisco routers is that most commands used in the IOS software they run on, are identical across multiple platforms. For example, commands for configuring a gigabit ethernet interface on a Cisco 2821 ...
Password recovery is a fairly frequently used procedure for administrators and engineers. Even though we usually stack our passwords in some word, excel or text file, it's very easy to forget to update them when changes occur. The end result is you fin...
Remote VPN access is an extremely popular service amongst Cisco routers and ASA Firewalls. The flexibility of having remote access to our corporate network and its resources literally from anywhere in the world, has proven extremely useful and in many ...
This article serves as an extension to our popular Cisco VPN topics covered here on Firewall.cx. While we've covered Site to Site IPSec VPN Tunnel Between Cisco Routers [1] (using static public IP addresses), we will now take a look on how to configure...
Our Web SSL VPN [1] article written back in 2011 introduced this new wave of VPN services. This article extends the topic by covering the installation and configuration of Cisco's SSL AnyConnect VPN for Cisco IOS Routers. Web SSL VPN delivers the fo...
NAT [1] (Network Address Translation [2]) is a method that allows the translation (modification) of IP addresses while packets/datagrams are traversing the network. Dynamic NAT enables multiple internal hosts access to the Internet by assigning each ho...
NAT (Network Address Translation) is a method that allows the translation (modification) of IP addresses while packets/datagrams are traversing the network. NAT Overload, also known as PAT (Port Address Translation) is essentially NAT with the added fe...
Network Time Protocol (NTP) is a vital service not only for Cisco devices but almost every network device. Any computer-based device needs to be accurately synchronised with a reliable time source such as an NTP server. When it comes to Cisco router...
GENERIC ROUTING ENCAPSULATION (GRE) is a tunneling protocol developed by Cisco that allows the encapsulation of a wide variety of network layer protocols inside point-to-point links. A GRE TUNNEL is used when packets need to be sent from one network...
The Point to Point Tunneling Protocol (PPTP) is a network protocol used to create VPN tunnels between public networks. These VPN tunnels are encrypted from one end to the other and allow the secure transfer of data between them. PPTP is usually impleme...
Site-to-Site IPSec VPN Tunnels are used to allow the secure transmission of data, voice and video between two sites (e.g offices or branches). The VPN tunnel is created over the Internet public network and encrypted using a number of advanced encryptio...
In today's network environment, redundancy is one of the most important aspects, whether its on the LAN side or on the WAN side. In this topic we will be covering WAN redundancy with multiple WAN links terminating on a single router. The best and si...
Most Cisco engineers are aware of the classic Password-Recovery service Cisco equipment have. If the device's credentials are lost, then performing the Password-Recovery procedure will effectively provide full access to the device's configuration. B...
This article shows how to CONFIGURE AND SETUP SSH for REMOTE MANAGEMENT of CISCO IOS ROUTERS. We'll show you HOW TO CHECK IF SSH IS SUPPORTED by your IOS VERSION, how to enable it, GENERATE AN RSA KEY for your router and finally configure SSH AS THE PR...
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 to be a VERY STRESSFUL and DESTRUCTIVE PROCESS if som...
If you're tired of setting up SPAN sessions [1] to CAPTURE NETWORK TRAFFIC TRANSITING YOUR NETWORK and CISCO ROUTER, it's time to start using CISCO'S EMBEDDED PACKET CAPTURE (EPC), available from IOS 12.4.20T and above. We will show you HOW TO CONFIGUR...
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 and Internet resources such as IP Address, Default Gat...
The DNS protocol is used to resolve FQDN (Fully Qualified Domain Names) to IP addresses around the world. This allows us to successfully find and connect to Internet websites and services no matter where they are. Its usefulness, however, doesn't stop ...
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 you had a domain name, e.g Firewall.cx, you would t...
Router-on-a-stick is a term frequently used to describe a setup up that consists of a router and switch connected using one Ethernet link configured as an 802.1q trunk link. In this setup, the switch is configured with multiple VLANs and the router per...
Setting up a Windows VPDN connection is a required task in order to connect to a remote network. In previous articles we covered the set up of a VPDN - PPTP server on a Cisco router. Click here [1] to find out how to setup a PPTP (VPDN) server on a Cis...
Our previous article shows how to perform a password recovery on the Cisco Catalyst switches [1]. This article will now explain how to DISABLE or ENABLE the CISCO PASSWORD RECOVERY SERVICE allowing network engineers and administrators to further SECURE...
Our previous article covered how to fix the Cisco Configuration Professional display/window problem [1] where the CCP application is displayed in about one third of the browser's window. Users looking for Cisco's CCP will be happy to know that it is av...
Cisco Configuration Professional (CCP) is Cisco's latest GUI administration tool used to administer Cisco routers. CCP is basically the next step up from the popular Security Device Manager or SDM. Users seeking more information on SDM's installation c...
In our article Cisco VPN Client Configuration - Setup for IOS Router [1] we explained how to setup up a Cisco IOS router to support Cisco IPSec VPN clients, allowing remote users to securely connect to the company network and access the available resou...
In today's complex network environments securing your network routers can be a daunting task, especially when there are so many CLI commands and parameters with different security implications for your Cisco router device. Thankfully, since Cisco IO...
This article shows how to RESET A PASSWORD on a CISCO CATALYST 3750-X (stacked or single unit) and CISCO CATALYST 3560-X switch without losing its startup configuration. The CISCO PASSWORD RECOVERY PROCEDURE involves interrupting the switch's normal bo...
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 encountered when the Cisco device (router or multi-layer swit...
In previous articles, we showed how it is possible to configure a Cisco router [1] or Catalyst switch [2] to provide DHCP server services to network clients. Everything usually works without a problem, however there are times when the CISCO DHCP SERVER...
The Point-to-Point Protocol is one of the most popular protocols around used by engineers, ISPs and companies around the globe for authentication of remote users margin-left: auto; margin-right: auto;" title="Troubleshooting Cisco Router PPP Negotiati...
This article provides an in-depth explanation of PPP Multilink and shows how to configure a Cisco router to use PPP Multilink between two serial interfaces (WIC-1T). We'll show you the commands that are required for the configuration, plus how to ensur...
This article focuses on VLAN Security and its implementation within the business network environment. We provide tips and Cisco CLI commands that will help you upgrade your VLAN network security. Even though many Administrators and IT Managers are a...
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