Troubleshooting guide

ManualsBrandsCisco ManualsComputer equipment827 - 827 Router - EN

Router#configure terminal

Router(config)#interface dialer 1

Router(config−if)#mtu 1492

Router(config−if)#ip <ip address> <subnet mask>

Router(config−if)#no ip directed−broadcast

Router(config−if)#ip nat outside

Router(config−if)#encapsulation ppp

Router(config−if)#dialer pool 1

Router(config−if)#ppp chap hostname <username>

Router(config−if)#ppp chap password <password>

Router(config−if)#ppp pap sent−username <username> password <password>

Router(config−if)#end

Configure a default route using Dialer1 as the outbound interface.

Router#configure terminal

Router(config)#ip route 0.0.0.0 0.0.0.0 dialer1

Router(config)#end

Configure global NAT commands on the Cisco DSL Router to allow sharing of the dynamic public IP

address of the Dialer interface.

Router#configure terminal

Router(config)#ip nat inside source list 1 interface Dialer1 overload

Router(config)#access−list 1 permit <ip network address of ethernet0>

Router(config)#end

Optional Configurations

NAT Pool, if additional IP addresses have been provided by your ISP.

Router(config)#ip nat inside source list 1 interface dialer1 overload

Router(config)#ip nat pool <nat pool name> <first ip address>

<last ip address> netmask <subnet mask>

Router(config)#end

Static NAT, if Internet users require access to internal servers.

Router(config)#ip nat inside source static tcp <inside ip address of server>

{80 or 25} <outside well−known ip address of server> {80 or 25} extendable

Router(config)#end

(Optional) Configure the Cisco DSL Router as a DHCP server with a pool of IP addresses to assign to

hosts connected to the Ethernet interface of the Cisco DSL Router. The DHCP server dynamically

assigns an IP address, Domain Name Server (DNS), and the default gateway IP address to your hosts.

Router#configure terminal

Router(config)#ip dhcp excluded−address <ip address of ethernet0>

Router(config)#ip dhcp pool <dhcp pool name>

Router(dhcp−config)#network <ip network address of ethernet0> <subnet mask>

Router(dhcp−config)#default−router <ip address of ethernet0>

Router(dhcp−config)#dns−server <ip address of primary dns server>

Router(dhcp−config)#end

10.

Enable logging console on the Cisco DSL Router, and then write all the changes to memory.

Router#configure terminal

Router(config)#logging console

Router(config)#end

*Jan 1 00:00:00.100: %SYS−5−CONFIG_I: Configured from console by console

Router#write memory

11.

Cisco DSL Router Configuration and Troubleshooting Guide