If you're new here, you may want to subscribe to my RSS feed. Thanks for visiting!

Preparing you system

First you need to install DHCP,BIND servers using the following command

(more…)

There are some new IOS commands to automate upgrading of a stack, but I use the familiar manual method.

(more…)

(more…)

Patch critical vulnerabilities: Just like any other network device or application, Cisco routers and switches are also prone to security holes. And because routers and switches are critical to network infrastructure, you should plug these security holes as soon as possible.

(more…)

If you want to ensure that only a certain device—for example, a server—is plugged into a particular switch port, you can configure the MAC address of the server as a static entry associated with the switch port.

(more…)

Ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies. At first glance, this might seem like a rather useless thing to do, but it can actually come in handy in some cases. The following example illustrates the main motivation in creating ptunnel:

(more…)

There are five passwords used to secure your Cisco routers: console, auxiliary, telnet (VTY),enable password, and enable secret. Just as you learned earlier in the chapter, the first two passwords are used to set your enable password that’s used to secure privileged mode. This will prompt a user for a password when the enable command is used. The other three are used to configure a password when user mode is accessed either through the console port, through the auxiliary port, or via Telnet.

(more…)

OpManager is a network monitoring software that can automatically discover your network; group your devices into intuitive maps, monitor devices in real-time and alert instantaneously on failure. It serves as a complete network monitoring solution by providing complete fault and performance functionality across your WAN and LAN infrastructure.

(more…)

This ‘How to’ is written to show the step by step password recovery of the Cisco Routers. It is assumed that you have a prior knowledge of what a router is and its basic function. It is also assumed the you are having some experience of configuring the router.

(more…)

Layer 2 switch is A network device that forwards traffic based on MAC layer (Ethernet or Token Ring) addresses.

(more…)