PPPoE – PPP over Ethernet
In the 1990s, we went on the Internet via our analog modems.
Our modem (Modulator / Demodulator) allowed us to switch from the digital signal (of the 0 and 1) of our computer to the analog signal of our telephone line.
The protocol used between our modems was the Point to Point Protocol (PPP). It offered CHAP authentication.
This authentication allowed the ISP to identify each of its customers and see if they were up to date with payment.
When switching analog Modem / Modem ADSL, internet service providers no longer had a solution to authenticate their customers with an ADSL modem since there was no longer a PPP link but an Ethernet link.
In order to continue using THE CHAP authentication of the PPP protocol, it was decided to encapsulate the PPP protocol through the Ethernet protocol.
The PPPoE protocol was born (PPP over Ethernet).
– Creates a level 2 tunnel between two routers.
– Take 8 bytes.
– Must be point-to-point!
A PPPoE tunnel can only be mounted between two directly connected routers!
Router (config) - dialer interface 2 Router (config-if) ip address negotiated Router (config-if) mtu 1492 Router (config-if) ppp encapsulation Router (config-if) ppp chap hostname Finger Router (config-if) ppp chap password InTheNet Router (config-if) - dialer pool 1 Router (config) - FastEthernet interface 0/1 Router (config-if) no ip address Router (config-if) pppoe-client dial-pool-number 1 Router (config-if) - pppoe enable
The number 1 represents a "working group."
We will put in this "working group" our dialer interface as well as our physical interface in order to mount our PPPoE link.
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