Configuring IDSL Routers

router(config)# hostname 802
 

Step 2 Specify a username and password. The username is the destination router's hostname. The password must be the same for both the host and destination routers. For example:

router(config)# username isp password cisco
 

Step 3 Set the switch type. For example:

router(config)# isdn switch-type basic-5ess
 

Step 4 Set the BRI interface to use the ISDN physical connection as a leased-line service. The following example sets the line speed at 128 kbps:

router(config)# isdn leased-line bri0 128
 

Step 5 Configure DHCP relay pool name. For example:

router(config)# ip dhcp pool DHCPpoolLAN_0
 

Step 6 Set the DHCP pool of addresses. For example:

router(dhcp-config)# network 192.168.1.0 255.255.255.0
 

Step 7 Set the IP addresses of the DNS servers. For example:

router(dhcp-config)# dns-server 172.29.20.41 172.29.20.51
 

Step 8 Set the NetBIOS servers. For example:

router(dhcp-config)# netbios-name-server 172.29.20.41 172.29.20.51
 

Step 9 Set the Ethernet 0 IP address as the default gateway. For example:

router(dhcp-config)# default-router 192.168.1.1
 

Step 10 Exit to global configuration mode.

router(dhcp-config)# exit
router(config)#
 

Step 11 Define the IP addresses of the DNS servers. For example:

router(config)# ip name-server 172.29.20.41
router(config)# ip name-server 172.29.20.51
 

Step 12 Change to interface command mode. For example:

router(config)# interface ethernet0
router(config-if)#
 

Step 13 Enter the IP address and subnet mask for the LAN. For example:

router(config-if)# ip address 192.168.1.1 255.255.255.0
 

Step 14 Enable Network Address Translation (NAT) on your LAN. The inside network address is not directly routed to the Internet but is subject to translation to a routable address outside the LAN.

router(config-if)# ip nat inside
 

Step 15 Set the BRI interface IP address. In the following example, IP addresses are dynamically assigned:

router(config-if)# interface bri0
router(config-if)# ip address negotiated
 

Step 16 Enable PPP.

router(config-if)# encapsulation ppp
 

Step 17 Configure CHAP authentication.

router(config-if)# ppp authentication chap
 

Step 18 Configure a valid Internet address to which the inside network address will be translated.

router(config-if)# ip nat outside
 

Step 19 Define the router hostname and password to authenticate. For example:

router(config-if)# ppp chap hostname 802
router(config-if)# ppp chap password cisco
 

Step 20 Exit to global configuration mode. Add default route and interface. For example:

router(config-if)# exit
router(config)# ip route 0.0.0.0 0.0.0.0 bri0
 

Step 21 Set global NAT commands. In the following example, all inside network addresses assigned to interface BRI0 are configured for translation, and the access list that contains the inside network addresses is defined.

router(config)# ip nat inside source list 1 interface bri0 overload
router(config)# access-list 1 permit 192.168.1.0 0.0.0.255
 

Step 22 Change to user mode, then save your configuration.

router# exit
router# copy running-config startup-config

router(config)# hostname 802
 

Step 2 Specify a username and password. The username is the destination router's hostname. The password must be the same for both the host and destination routers. For example:

router(config)# username isp password cisco
 

Step 3 Set the switch type. For example:

router(config)# isdn switch-type basic-5ess
 

Step 4 Set the BRI interfaces to use the ISDN physical connection as a leased-line service. The following example sets the line speed at 144 kbps:

router(config)# isdn leased-line bri0 144
router(config)# isdn leased-line bri0.1 144
 

Step 5 Change to interface command mode. For example:

router(config)# interface ethernet0
 

Step 6 Enter an IP address. For example:

router(config-if)# ip address 192.168.2.1 255.255.255.0
 

Step 7 Enable Network Address Translation (NAT) on your LAN. The inside network address is not directly routed to the Internet but is subject to translation to a routable address outside the LAN.

router(config-if)# ip nat inside
 

Step 8 Change to BRI interface.

router(config-if)# interface bri0
 

Step 9 Configure interface with no IP address.

router(config-if)# no ip address
 

Step 10 Configure NAT so that the inside network address will be translated to a valid Internet address.

router(config-if)# ip nat outside
 

Step 11 Specify the encapsulation type. In the following example, IETF is used to connect to non-Cisco routers.

router(config-if)# encapsulation frame-relay ietf
 

Step 12 Specify the Local Management Interface (LMI) type used by the Frame Relay switch. For example:

router(config-if)# frame-relay lmi-type ansi
 

Step 13 Specify the subinterface point-to-point. For example:

router(config-if)# interface bri0:1 point-to-point
 

Step 14 Specify the IP address on the subinterface. For example:

router(config-if)# ip address 209.188.2.2 255.255.255.0
 

Step 15 Change to global configuration mode and specify a DLCI number that is used to connect to the Internet service provider. For example:

router(config-if)# exit
router(config)# frame-relay interface dlci 16 ieft
 

Step 16 Set global NAT commands. In the following example, all inside network addresses assigned to interface BRI0 are configured for translation, and the access list that contains the inside network addresses is defined:

router(config)# ip nat inside source list 1 interface bri0 overload
router(config)# access-list 1 permit 192.168.1.0 0.0.0.255
 

Step 17 Change to user mode and save your configuration.

router# exit
router# copy running-config startup-config