Tag: Cisco General

Saturday 12 March 2011

ROM, RAM, NVRAM and Flash Memory on Cisco Routers

Sometimes people get confused when it comes to telling how much memory the router has and which memory does what. There are 4 memory terms you should be familiar with, and 2 of these should be checked before upgrading the router’s IOS.

Cisco Comments: 5

Sunday 13 February 2011

Creating Users on a Cisco Router

Having user accounts on a router makes life and logging much easier. We can assign different privilige levels to different users to restrict access to certain commands. You may want a junior admin to see a few things to help you troubleshoot but you don’t want him to be able to change anything. In the following example we are going to add 2 local user accounts, one with the default privilege level (0) and one with full privilege level (15).

Cisco/Management Comments: 4

Sunday 06 February 2011

Configuring PPP Authentication # Method2

In this example we will configure PPP authentication with an alternate method. We are going to instruct the router to send different credentials (other than it’s own hostname) to the other side. In contrast to the previous method, this works even if you change the routers name.

Cisco/Security Comments: 0

Sunday 30 January 2011

Configuring PPP Authentication # Method1

By configuring authentication on our serial interfaces, we can restrict access to our router. This is not just useful, but it is highly recommended to implement authentication and a high level of security on all devices whenever possible, especially the ones facing the Internet.

Cisco/Security Comments: 4

Sunday 23 January 2011

Configuring Serial Interfaces on a Cisco Router

Serial interfaces are used to communicate with other local Cisco Routers or to establish a connection to the WAN through a CSU/DSU device. The required steps are almost identical to the configuration of any other interface’s with a few exceptions. When connecting two Cisco routers directly with a DCE/DTE cable, the router which has the DCE end of the cable connected to it has to be configured to dictate the clock rate. It is essential for proper communication.

Cisco Comments: 3