Configuring the Cisco 827
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In this walthru I will show you how to erase the config on your 827 and input the default configuration. Plus i will give you some templates for different configuration types.
First step is to get access to the router through the console cable. Here is my link on setting up hyperterminal
Once you have managed to configure hyperterminal you will need to get into enable mode. If you are at a promt that looks something like this Router> then type in en then hit ENTER. If you are prompted for a password then enter your password. If your router was configured by your ISP you may have to contact them to get the router passwords.
Now that you are in enable mode we will clear the startup config of the router so we can program it to our needs. Type in the command write erase then hit ENTER. Your router will display the message Erasing the nvram filesystem will remove all files! Continue? [confirm] Just type y then hit ENTER a couple of times to get back to the prompt. From here we want to reboot the router. Type in the command reload then hit ENTER. When the router replies with Proceed with reload? [confirm] Hit ENTER again. What the write erase command does is clear out the startup-config file on the router. Everytime the router is rebooted it takes the startup-config file and copies it to the running-config. Another point to mention is that write erase will clear out any passwords, NAT entries, firewall entries etc.. you will be left with a very basic config that has none of these settings in it.
As the router is booting back up you will see it scroll through several messages. It will finally stop on a message that reads Would you like to enter the initial configuration dialog? [yes/no]:type n and then hit ENTER a few of times. You will see more messages scroll across til the router finally ends up at a Router> prompt. Once again we have to get into enable mode. This time you won't have to put in a password to get into enable mode.
In enable mode you should have a prompt that now looks like this Router# At this point we need to get into configuration mode. Type in the command config t then hit ENTER. Your prompt should now look like this Router(config)# This is where we will do our router config.
PPPoA NAT Configuration This would be for dynamically assigned IP address Printer Friendly Version	PPPoA Static IP Configuration This would be for statically assigned IP addresses Printer Friendly Version
no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname Router ! logging console enable secret ENABLE_PASSWORD ! username Router password ENABLE_PASSWORD ip subnet-zero ip name-server PRIMARY_DNS_SERVER ip name-server SECONDARY_DNS_SERVER ip dhcp excluded-address 10.10.10.1 ! ip dhcp pool CLIENT network 10.10.10.0 255.255.255.0 default-router 10.10.10.1 dns-server PRIMARY_DNS_SERVER SECONDARY_DNS_SERVER lease infinite ! ! ! ! interface Ethernet0 ip address 10.10.10.1 255.255.255.0 ip nat inside hold-queue 100 out ! interface ATM0 no ip address no atm ilmi-keepalive dsl operating-mode auto hold-queue 224 in ! interface ATM0.1 point-to-point pvc 0/35 encapsulation aal5mux ppp dialer dialer pool-member 1 ! ! interface Dialer1 ip address negotiated ip nat outside encapsulation ppp dialer pool 1 dialer-group 1 ppp authentication pap callin ppp pap sent-username USER_ID password PASSWORD ! ip nat inside source list 102 interface Dialer1 overload ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 no ip http server ! ! access-list 102 permit ip 10.10.10.0 0.0.0.255 any dialer-list 1 protocol ip permit ! line con 0 exec-timeout 120 0 password EXEC_PASSWORD stopbits 1 line vty 0 4 exec-timeout 120 0 password EXEC_PASSWORD login local length 0 ! scheduler max-task-time 5000 end copy run start	no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname Router ! logging console enable secret ENABLE_PASSWORD ! username Router password ENABLE_PASSWORD ip subnet-zero ip name-server PRIMARY_DNS_SERVER ip name-server SECONDARY_DNS_SERVER ! ! ! ! interface Ethernet0 ip address ROUTER_IP ROUTER_SUBNET hold-queue 100 out ! interface ATM0 no ip address no atm ilmi-keepalive dsl operating-mode auto hold-queue 224 in ! interface ATM0.1 point-to-point pvc 0/35 encapsulation aal5mux ppp dialer dialer pool-member 1 ! ! interface Dialer1 ip unnumbered Ethernet0 encapsulation ppp dialer pool 1 dialer-group 1 ppp authentication pap callin ppp pap sent-username USER_ID password PASSWORD ! ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 no ip http server ! ! dialer-list 1 protocol ip permit ! line con 0 exec-timeout 120 0 password EXEC_PASSWORD stopbits 1 line vty 0 4 exec-timeout 120 0 password EXEC_PASSWORD login local length 0 ! scheduler max-task-time 5000 end copy run start
PPPoE NAT Configuration This would be for dynamically assigned IP address Printer Friendly Version	PPPoE Static IP Configuration This would be for statically assigned IP addresses Printer Friendly Version
no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname Router ! logging console enable secret ENABLE_PASSWORD ! username Router password ENABLE_PASSWORD ip subnet-zero ip domain-lookup ip name-server PRIMARY_DNS_SERVER ip name-server SECONDARY_DNS_SERVER ip dhcp excluded-address 10.10.10.1 ! ip dhcp pool CLIENT no import all network 10.10.10.0 255.255.255.0 default-router 10.10.10.1 dns-server PRIMARY_DNS_SERVER SECONDARY_DNS_SERVER lease infinite ! vpdn enable ! vpdn-group pppoe request-dialin protocol pppoe ip mtu adjust ! ! ! ! ! interface Ethernet0 ip address 10.10.10.1 255.255.255.0 ip nat inside ip mtu 1492 ip tcp adjust-mss 1452 hold-queue 100 out no shutdown ! interface ATM0 no ip address no atm ilmi-keepalive dsl operating-mode auto hold-queue 224 in no shutdown ! interface ATM0.1 point-to-point pvc 0/35 pppoe-client dial-pool-number 1 ! ! interface Dialer1 ip address negotiated ip mtu 1492 ip tcp adjust-mss 1452 ip nat outside encapsulation ppp dialer pool 1 dialer-group 1 ppp authentication pap callin ppp pap sent-username USERID password PASSWORD ! ip nat inside source list 102 interface Dialer1 overload ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 no ip http server ! ! access-list 102 permit ip 10.10.10.0 0.0.0.255 any dialer-list 1 protocol ip permit ! line con 0 exec-timeout 120 0 password EXEC_PASSWORD stopbits 1 line vty 0 4 exec-timeout 120 0 password EXEC_PASSWORD login local length 0 scheduler max-task-time 5000 end copy run start	no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname Router ! logging console enable secret ENABLE_PASSWORD ! username Router password ENABLE_PASSWORD ip subnet-zero ip domain-lookup ip name-server PRIMARY_DNS_SERVER ip name-server SECONDARY_DNS_SERVER ! vpdn enable ! vpdn-group pppoe request-dialin protocol pppoe ip mtu adjust ! ! ! ! interface Ethernet0 ip address ROUTER_IP ROUTER_SUBNET ip tcp adjust-mss 1452 hold-queue 100 out no shutdown ! interface ATM0 no ip address no atm ilmi-keepalive dsl operating-mode auto hold-queue 224 in no shutdown ! interface ATM0.1 point-to-point pvc 0/35 pppoe-client dial-pool-number 1 ! ! interface Dialer1 ip unnumbered Ethernet0 ip mtu 1492 encapsulation ppp ip tcp adjust-mss 1452 dialer pool 1 dialer-group 1 ppp authentication pap callin ppp pap sent-username USER_ID password PASSWORD ! ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 no ip http server ! ! ! line con 0 exec-timeout 120 0 password EXEC_PASSWORD stopbits 1 line vty 0 4 exec-timeout 120 0 password EXEC_PASSWORD login local length 0 ! scheduler max-task-time 5000 end copy run start
Once you type in copy run start and hit ENTER on the keyboard, the router will now ask Destination filename [startup-config]? Just hit the ENTER key on the keyboard then you should see. Building configuration... [OK] At this point you should now be back to your router prompt, now you can just close out of your console, you are done.
All areas that are colored YELLOW in the configurations are areas of information they you have to supply, such as userid password etc.. The areas that I have labled as EXEC_PASSWORD and ENABLE_PASSWORD are the passwords to get into the router, I suggest using your account password and then tack on #exec or #enable to the end. So if your password is ilovedsl then make your exec password ilovedsl#exec and your enable password ilovedsl#enable.

Configuring the Cisco 827