我有一个旧的 Ubuntu 10.04 安装，我想把它变成路由器。我有一部带 3g 的手机，通过 USB 绑定到我的电脑，我想用以太网连接一个 Vonage 盒子。
Nexus 4 ---------->> 电脑 --------------->> Vonage
网络可以在互联网上运行，但是 vonage 现在无法访问互联网。
请帮忙！
编辑：这是 ifconfig -a 的结果：
eth0 Link encap:Ethernet HWaddr 00:24:e8:eb:a0:82
inet6 addr: fe80::224:e8ff:feeb:a082/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2460 errors:0 dropped:0 overruns:0 frame:0
TX packets:1811 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:942876 (942.8 KB) TX bytes:212067 (212.0 KB)
Interrupt:27 Base address:0x4000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:529 errors:0 dropped:0 overruns:0 frame:0
TX packets:529 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:45433 (45.4 KB) TX bytes:45433 (45.4 KB)
usb0 Link encap:Ethernet HWaddr 92:50:73:bb:25:38
inet addr:192.168.42.232 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::9050:73ff:febb:2538/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3076 errors:0 dropped:0 overruns:0 frame:0
TX packets:3913 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1597102 (1.5 MB) TX bytes:692155 (692.1 KB)
wlan0 Link encap:Ethernet HWaddr 0c:ee:e6:9c:8a:62
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)