Upgrade Ubuntu 16.04 LTS after DSL dial-up Internet (PPP) connection Auto Disconnect Solution

Originally in Ubuntu 15.10 with dial-up Internet no problem, but upgraded 16.04 LTS found the original DSL connection is not on. The main performance is:

1, in NetworkManager the choice DSL connection can try to dial the connection, even after two or three seconds on the broken;

2, after many times in accordance with the online method to modify the strange configuration, ultimately not even at all;

3, delete the DSL connection re-establish a, the same problem;

4, try to delete networkmanager configuration file, Wired connection and DSL connection have deleted the restart service, attempt to restore the original appearance, no fruit;

5, the use of pppoeconf dial authentication, multiple attempts to different configurations have not been successful;

N, really a bitter tear ...

Since the system has not been trained, the log is all squeezed together, um ... Finally saw a similar "PPPD ... echo" word, so in the NetworkManager to modify the DSL connection properties, in the PPP settings uncheck the option to send Echo packet ("Send PPP echo Packets") , dial again successfully to keep the connection! Moved

Then it is reasonable to set a very large value in the/etc/ppp/options for Lcp-echo-interval (echo send interval), lcp-echo-failure (number of failures), which should be feasible and not attempted.

　　Now there is a problem , git, SVN, SCP and other tools in the DSL dial-up Internet can not upload anything! Always stuck in a strange place, Git is in the push card after writing objects, SCP, SFTP is directly stalled, with WiFi is not the problem, before using Ubuntu 15.10 DSL Dial-up Internet does not have this problem, the mystery of the puzzle. Hope each road master in passing see, if know the reason, can tell me in the comment area, thank you!

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Upgrade Ubuntu 16.04 LTS after DSL dial-up Internet (PPP) connection auto-disconnect solution