pppoe on ubuntu

ubuntu16.04 amd64
(ok under i7pc, fail under i7tp 

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sudo -s
apt-get install pppoeconf traceroute curl wget
pppoeconf  # xxxxxxxx@hient.net  aaaaaaaa  (fixed ip in hinet: xxxxxxxx@ip.hinet.net
poff	# poff -a (if encounter any error
pon dsl-provider
plog
ifconfig
#traceroute ptt.cc
#nano /etc/network/interfaces
route add default dev ppp0  # set as default routing.
curl ipinfo.io # confirm the default routing works
ifconfig ppp0 && poff && pon dsl-provider && ifconfig ppp0 # force renewing pppoe ip