Cisco IOS

Cisco IOS PPPoE Proceedure

The following should work for most Cisco IOS versions.

On a Cisco device running IOS you will want to create a new PPPoE interface/dialer. The following should be what is needed:

interface Dialer1

ip address negotiated (you can also specify the ip with <xm ip address> <subnet mask>, but this is not recommended)

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

no cdp enable

ppp pap sent-username <xmusername> password <xmpassword>

You will then want to configure the WAN port interface to use this dialer:

interface FastEthernet<whatever interface>

no ip address

no ip redirects

no ip unreachables

no ip proxy-arp

ip tcp adjust-mss 1452

duplex auto

speed auto

pppoe enable

pppoe-client dial-pool-number 1

Note: All of your router connected LANs will need to have the "ip tcp adjust-mss 1452" statement as well to match the outgoing interface.

Specifically, you can follow these step-by-step instructions:

After you telnet to the router and are at the CLI (command line interface) you will need to enter enable mode:

router>enable

password:

router#

You will then need to enter the configuration terminal to edit/add interfaces and commands:

router#config t

Enter configuration commands, one per line. End with CNTL/Z.

router(config)#

The next step is to configure the dialer/pppoe interface. We named this example "Dialer1:"

router(config)#interface Dialer1

router(config-if)#

Now all we need to do is add the following options:

router(config-if)#ip address negotiated

router(config-if)#ip virtual-reassembly

router(config-if)#encapsulation ppp

router(config-if)#dialer pool 1

router(config-if)#dialer-group 1

router(config-if)#no cdp enable

router(config-if)#ppp pap sent-username <xmusername> password <xmpassword>

router(config-if)#exit

Last we need to configure the physical interface on the WAN port:

router(config)#interface FastEthernet<whatever interface>

router(config-if)#no ip address

router(config-if)#no ip redirects

router(config-if)#no ip unreachables

router(config-if)#no ip proxy-arp

router(config-if)#ip tcp adjust-mss 1452

router(config-if)#duplex auto

router(config-if)#speed auto

router(config-if)#pppoe enable

router(config-if)#pppoe-client dial-pool-number 1

router(config-if)#exit

Now we just need to exit and write the changes:

router(config)#exit

router#write