ubuntu 上的 pppoe 自動重撥

Dec 26 10:15:53 mx01 pppd[778]: No response to 4 echo-requests
Dec 26 10:15:53 mx01 pppd[778]: Serial link appears to be disconnected.
Dec 26 10:15:53 mx01 pppd[778]: Connect time 2224.5 minutes.
Dec 26 10:15:53 mx01 pppd[778]: Sent 137161190 bytes, received 206597813 bytes.
Dec 26 10:15:53 mx01 pppd[778]: restoring old default route to eth0 [10.1.1.1]
Dec 26 10:15:53 mx01 systemd-networkd[668]: ppp0: Lost carrier
Dec 26 10:15:59 mx01 pppd[778]: Connection terminated.
Dec 26 10:15:59 mx01 pppd[778]: Sent PADT
Dec 26 10:15:59 mx01 pppd[778]: Modem hangup

lcp-echo-interval 20
lcp-echo-failure 40000
maxfail 0
holdoff 10
persist