[bazz2 -v1] first version
translating by johnhoow
[bazz2 work complete]How to use systemd for system administration on Debian
[bazz2 -ing] What' s wrong with IPv4 and Why we are moving to IPv6
校对中。
Merge pull request #1745 from johnhoow/master

translating by johnhoow
Merge pull request #1746 from bazz2/master

[bazz2 work complete]How to use systemd for system administration on Debian
校对中