Cisco Routers for the Small Business: A Practical Guide for by Jason Neumann

By Jason Neumann

This e-book is meant for the common community directors or IT execs who
manage small networks and are at the moment utilizing, or are looking to use Cisco IOS-based routers in
their networks. in the end, why should still Cisco routers be reserved for elite Cisco professionals when
all you want to be aware of are a couple of easy recommendations and instructions? This booklet is set a Cisco
CLI for the usual man or gal. After studying this ebook, you’ll now not need to use cheap
consumer-grade routers in your small enterprise community. You, too, may have the entire reliability
and complex performance that the Cisco IOS deals.

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Additional info for Cisco Routers for the Small Business: A Practical Guide for IT Professionals

Sample text

Set the Privileged EXEC Mode Password Because privileged EXEC mode is so powerful, it’s best to secure it with a password. The Cisco IOS allows you to set several layers of passwords, but this is the big one, and I recommend you set it before you put your router online. The following code shows you how to set the privileged EXEC mode password to “cisco”: lab-r1> en lab-r1# config t lab-r1(config)# enable secret cisco In this example, you might assume I made a typo in the second line, but I didn’t.

He or she could even hijack your router. Also, if you don’t protect your CHAPTER 2 ■ CONFIGURING YOUR ROUTER router with some sort of ACL, then anyone from any host can log in remotely—even from the Internet! ” The good news is that you can take precautions to minimize your risk. Later, in Chapter 5, I’ll introduce you to a much better alternative to telnet, known as Secure Shell (SSH), which will encrypt all of your data. Listing 2-3 shows you all of the IOS commands to set up telnet on your router, and Listing 2-4 in the next section on “Securing VTY” shows how to secure it with an ACL.

You need to configure NAT and apply a firewall to protect your network from the outside world. NAT is a clever technology that allows all the computers on your network to access the Internet using only one registered IP address. It works by tagging host data before it leaves your network bound for the Internet. When a reply with information (say a web site you requested) returns to your router, its data contains the same tags. NAT then looks in its address translation table to determine to which computer on your private network the data should be directed.

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