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

By Jason Neumann

Cisco Routers for the Small Business offers, in undeniable English, a no–nonsense method of establishing the entire positive aspects of the Cisco IOS for a small company utilizing broadband applied sciences. This booklet explains how one can use a Cisco router to setup cable modems, DSL and PPPoE, and explains the right way to configure NAT, entry keep an eye on Lists, Firewalls, DMZs and an IPSec VPN among websites utilizing complicated encryption. The chapters are tutorial-based and supply easy-to-follow, step–by–step directions for all initiatives 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 akin to cable net and DSL.
  • Provides easily–followed, step–by–step directions for projects that small companies have to practice, comparable to configuring digital deepest community (VPN) connections, developing 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

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If you run your own DNS servers on your LAN, enter their IP addresses here; otherwise, use those provided to you by your Internet Service Provider. Step 6: Define a WINS Server (Optional) If you have a Microsoft WINS (Windows Internet Name Service) server on your network that you want accessible to your workstations, use the command netbios-name-server and the IP address of your WINS server. 2. If you don’t have a WINS server or even know what one is, then skip this step. Step 7: Define a DHCP Lease Time The command lease defines how long your hosts may keep their DHCP-assigned IP addresses.

Since you’re using your router as an Internet gateway, your firewall “IPFW” is applied to the WAN interface, as shown in Listing 2-11. Listing 2-11. How to Apply a Firewall to an Interface lab-r1> ena lab-r1# config t lab-r1(config)# int fa4 lab-r1(config-if)# ip inspect IPFW out lab-r1(config-if)# exit lab-r1(config)# exit lab-r1# Go to interface configuration mode and issue the command ip inspect IPFW out to apply the firewall named IPFW to outbound traffic on your WAN interface fa4. This begs the obvious question: how can applying a firewall to outbound traffic on your WAN CHAPTER 2 ■ CONFIGURING YOUR ROUTER interface protect you from bad guys coming in from the Internet on your WAN interface?

Step 3: Assign an IP Address to Your Interface Use the command ip address to assign an IP address to your interface. 0. Replace this with a real IP address assigned to you by your ISP. Step 4: Set the Duplex and Speed on Your Interface The command duplex auto configures your router to automatically set its duplex to full or half duplex, based on the type of cable modem your ISP provides. Use the speed auto command to adjust the port speed automatically between 10 and 100 Mbps. Step 5: Bring Up the Interface Next, bring up the interface with the command no shutdown (abbreviated no shut).

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