我尝试通过这种方式使用ppp0端点释放java套接字连接：
Socket socket = new Socket(InetAddress.getByName("200.147.67.142"), 80, InetAddress.getByName("189.116.7.204"), 4447);
其中189.116.7.204是ppp0接口的IP地址，200.147.67.142是目标。
问题是： TimeoutException
我的网络配置：
ifconfig -a
eth0 Link encap:Ethernet Endereço de HW b8:27:eb:fb:45:a6
UP BROADCASTMULTICAST MTU:1500 Métrica:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
colisões:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Loopback Local
inet end.: 127.0.0.1 Masc:255.0.0.0
UP LOOPBACKRUNNING MTU:16436 Métrica:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
colisões:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ppp0 Link encap:Protocolo Ponto-a-Ponto
inet end.: 189.116.7.204 P-a-P:10.64.64.64 Masc:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Métrica:1
RX packets:24 errors:0 dropped:0 overruns:0 frame:0
TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
colisões:0 txqueuelen:3
RX bytes:408 (408.0 B) TX bytes:537 (537.0 B)
wlan0 Link encap:Ethernet Endereço de HW c8:3a:35:ca:4c:50
inet end.: 10.0.1.16 Bcast:10.0.1.255 Masc:255.255.255.0
UP BROADCASTRUNNING MULTICAST MTU:1500 Métrica:1
RX packets:35080 errors:0 dropped:1164 overruns:0 frame:0
TX packets:32267 errors:0 dropped:0 overruns:0 carrier:0
colisões:0 txqueuelen:1000
RX bytes:23543046 (22.4 MiB) TX bytes:11526680 (10.9 MiB)
wwan0 Link encap:Ethernet Endereço de HW 58:2c:80:13:92:63
UP BROADCASTRUNNING MULTICAST MTU:1500 Métrica:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
colisões:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
感谢您的帮助......