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

By Jason Neumann

Cisco Routers for the Small Business offers, in simple English, a no–nonsense method of establishing all of the beneficial properties of the Cisco IOS for a small enterprise utilizing broadband applied sciences. This e-book explains tips on how to use a Cisco router to setup cable modems, DSL and PPPoE, and explains the way to configure NAT, entry keep an eye on Lists, Firewalls, DMZs and an IPSec VPN among websites utilizing complex encryption. The chapters are tutorial-based and supply easy-to-follow, step–by–step directions for all projects that small companies have to practice utilizing a router. Easy–to–implement instance configurations are integrated within the appendices.

  • Written for the small company utilizing universal, broadband connections resembling cable web and DSL.
  • Provides easily–followed, step–by–step directions for initiatives that small companies have to practice, equivalent to configuring digital inner most community (VPN) connections, growing firewalls, securing the router, and extra.
  • Contains appendixes with instance configurations which are brief, to the purpose, and dead–simple to enforce.

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

Example text

Step 3: Configure NAT to Forward Traffic to a LAN Host Now that you have opened a hole in your IPFW-ACL for incoming e-mail, you need to tell the router what to do with the traffic. Typically, it’s forwarded to a static IP host on your 41 42 CHAPTER 2 ■ CONFIGURING YOUR ROUTER private network. In this case it should be forwarded to your e-mail server. We refer to that host as being a DMZ host. Any private host that is directly reachable from the Internet is a DMZ host. 3 on your private network: Listing 2-15.

In the case of an Internet router, the gateway address is always provided by your ISP. I like to think of it as the onramp to the Internet. 33 34 CHAPTER 2 ■ CONFIGURING YOUR ROUTER Step 7: Enable Domain Lookup The last step is to enable domain lookup using the command ip domain-lookup, and assign DNS servers using the command ip name-server. 3. At this point, you should be able to successfully ping a web site. Configuring NAT on Your Router There are just a few more things to be done before your router is ready to be used on the Internet.

You may want to save your existing configuration before you begin, in case you need to restore it later. See Chapter 5 to learn how to backup and restore files to a flash drive or a TFTP server. I strongly believe that hands-on experience is the best way to learn this material. Therefore, you really should work with a router. If you are currently using your Cisco router in a production environment, then you may want to BACKUP the existing configuration to a server before you begin, or acquire another router to work with during this tutorial.

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