Делаю по:http://www.gentoo-wiki.info/HOWTO_Connect_using_PPPoE
Итог: * WARNING: net.ppp0 has started, but is inactive
config_ppp0="ppp"
link_ppp0="enp5s0"
plugins_ppp0="pppoe"
username_ppp0='xxxxxxxxx@dsl.ukrtel.net'
password_ppp0='123456789'
pppd_ppp0="defaultroute usepeerdns lock"