如果我的机器 (OSX 10.9.2) 未连接到 Internet，并且我想使用pppd建立 pptp 连接：
$ sudo /usr/sbin/pppd serviceid 5BE14D3A-7B94-4704-ADE0-9883B189199E debug logfile /tmp/ppp.log plugin /System/Library/SystemConfiguration/PPPController.bundle/Contents/PlugIns/PPPDialogs.ppp plugin pptp.ppp remoteaddress 11.22.33.44 redialcount 1 redialtimer 5 idle 1800 mru 1500 mtu 1448 receive-all novj 0:0 noipdefault ipcp-accept-local ipcp-accept-remote user bbbbbb password cccccc hide-password noaskpassword looplocal defaultroute usepeerdns mppe-128 nodetach logfd 1
pppd 输出：
Thu Mar 27 15:09:30 2014 : publish_entry SCDSet() failed: Success!
Thu Mar 27 15:09:30 2014 : publish_entry SCDSet() failed: Success!
并以退出代码25终止：
$ echo $? …