Cisco ASA / BT Fiber To The Cabinet (FTTC) PPPoE config

I’m lucky enough to be in one of the few UK areas to have BT’s latest broadband offering – Fiber To The Cabinet or FTTC.

When the BT Openreach engineer decides to turn up, he will install a Huawei modem which hands off your public IP address (or subnet if you so choose) via PPPoE to your router of preference. Being a networking geek I chose a Cisco ASA 5505 firewall.

Below is a basic command-line config, I’ll get working on some ASDM screenshots soon for those who prefer the GUI (not my thing). Note the MTU size, for PPPoE overhead we need to trim 8 bytes off the 1500 Ethernet standard leaving 1492.

interface Vlan10
nameif outside
security-level 0
pppoe client vpdn group BTFTTC
ip address pppoe
mtu outside 1492
vpdn group BTFTTC request dialout pppoe
vpdn group BTFTTC localname [email protected]
vpdn group BTFTTC ppp authentication chap
vpdn username [email protected] password *ppp password*