This is a very common question that most of the nonspecialists may ask when configuring the newly purchased Cisco Router 1841. Basically one FA will be the Internet so you need something like:
int fa0/0
ip address 210.215.117.213 255.255.255.252
ip nat outside
int fa0/1
ip address 210.115.117.81 255.255.255.248
ip nat inside
ip route 0.0.0.0 0.0.0.0 210.215.117.214
In addition, you will have to use the following commands :
access-list 1 permit 210.215.117.80 0.0.0.7
ip nat inside source list 1 interface fa0/0 overload
Now, let’s share the configuration details step by step.
1. After startup，the following message will appear on the configuration screen:
Would you like to enter the initial configuration dialog? [yes/no]:
Type “yes” and press the “Enter” key.
2. Type “yes” in response to the following prompt:
Would you like to enter basic management setup? [yes/no]:
3. Create and enter a router hostname following the prompt. Follow your network’s standard naming protocols if applicable. If your naming protocol requires that you use the router’s physical location, such as “3rd Floor Server Room,” to identify the router, follow it.
4. Create and type in the following passwords when prompted. First, create an enable encrypted secret password which has been scrambled so that it cannot be read. Next, create an unencrypted enable password, which you can view when viewing the router’s configuration file; in case you will view the router’s configuration file if you are trouble-shooting problems with the router. Finally, create a virtual terminal password, which secures access to the router through non-console ports which are connections to the router that you make remotely, as opposed to those that you make when you are physically standing close to the router.
5. Type “Yes” to configure SNMP Network Management following the prompt, or “No” if you do not need it for your network. Enter the associated public community string if you entered “Yes”. The system will display a summary of the interfaces available for you to use.
6. Enter an interface that the router will use to connect to the management network from the displayed summary of available interfaces.
7. Type “Yes” to enable FastEthernet support, which allows the router to transmit data through the network at a fast rate of 100 megabits per second. Type in “Yes” to enable RJ-45 connectors, which are the plugs on the router that look like oversize telephone plugs, and into which you insert network cables. Type in “Yes” to enable duplex-mode operations, so that data can travel both to and from the router simultaneously, instead of traveling in only one direction at a time. Enter an IP address if you want to set an address manually. When you have finished, the router will display the new configuration and prompt you to save it.
8. Type “2″ at the prompt to save the new configuration to “nvram”, and exit.
int fa0/0
ip address 210.215.117.213 255.255.255.252
ip nat outside
int fa0/1
ip address 210.115.117.81 255.255.255.248
ip nat inside
ip route 0.0.0.0 0.0.0.0 210.215.117.214
In addition, you will have to use the following commands :
access-list 1 permit 210.215.117.80 0.0.0.7
ip nat inside source list 1 interface fa0/0 overload
Now, let’s share the configuration details step by step.
1. After startup，the following message will appear on the configuration screen:
Would you like to enter the initial configuration dialog? [yes/no]:
Type “yes” and press the “Enter” key.
2. Type “yes” in response to the following prompt:
Would you like to enter basic management setup? [yes/no]:
3. Create and enter a router hostname following the prompt. Follow your network’s standard naming protocols if applicable. If your naming protocol requires that you use the router’s physical location, such as “3rd Floor Server Room,” to identify the router, follow it.
4. Create and type in the following passwords when prompted. First, create an enable encrypted secret password which has been scrambled so that it cannot be read. Next, create an unencrypted enable password, which you can view when viewing the router’s configuration file; in case you will view the router’s configuration file if you are trouble-shooting problems with the router. Finally, create a virtual terminal password, which secures access to the router through non-console ports which are connections to the router that you make remotely, as opposed to those that you make when you are physically standing close to the router.
5. Type “Yes” to configure SNMP Network Management following the prompt, or “No” if you do not need it for your network. Enter the associated public community string if you entered “Yes”. The system will display a summary of the interfaces available for you to use.
6. Enter an interface that the router will use to connect to the management network from the displayed summary of available interfaces.
7. Type “Yes” to enable FastEthernet support, which allows the router to transmit data through the network at a fast rate of 100 megabits per second. Type in “Yes” to enable RJ-45 connectors, which are the plugs on the router that look like oversize telephone plugs, and into which you insert network cables. Type in “Yes” to enable duplex-mode operations, so that data can travel both to and from the router simultaneously, instead of traveling in only one direction at a time. Enter an IP address if you want to set an address manually. When you have finished, the router will display the new configuration and prompt you to save it.
8. Type “2″ at the prompt to save the new configuration to “nvram”, and exit.
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