BeagleBone Black如何同時無線SSH與上網 - Linux

最近我拿到了一塊BeagleBone Black (以下簡稱BBB)
我照著網路上的教學，用USB線ssh進了BBB的root
也在BBB的USB插了一張無線網卡D-LINK DWA-121，成功了連到了我家的router上網

root@beaglebone:~# ping www.google.com
PING www.google.com (74.125.203.99) 56(84) bytes of data.
64 bytes from www.google.com (74.125.203.99): icmp_req=1 ttl=47 time=17.3 ms
64 bytes from www.google.com (74.125.203.99): icmp_req=2 ttl=47 time=17.6 ms

但現在我想用無線的方式ssh進BBB，同時BBB也要保持連到我家的router上網

大概像這樣：筆電 <---經由無線ssh---> BBB <---DWA-121---> 外部網路

所以我就拿了一台Asus WL-330N插在BBB的RJ45
做了一些設定之後也成功的ssh進了BBB的root
但是ping了google卻沒有反應。我查了網卡的組態，卻看不出要從何下手...

root@beaglebone:~# ping www.google.com
PING www.google.com (10.0.0.1) 56(84) bytes of data.
From 192.168.220.1 icmp_seq=1 Destination Net Unreachable
From 192.168.220.1 icmp_seq=2 Destination Net Unreachable



root@beaglebone:~# ifconfig
eth0 Link encap:Ethernet HWaddr D0:FF:50:39:A9:1B
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:531 errors:0 dropped:491 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:47948 (46.8 KiB) TX bytes:0 (0.0 B)
Interrupt:56

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:65536 Metric:1
RX packets:40 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3459 (3.3 KiB) TX bytes:3459 (3.3 KiB)

usb0 Link encap:Ethernet HWaddr A6:A0:27:ED:1A:5F
inet addr:192.168.7.2 Bcast:192.168.7.3 Mask:255.255.255.252
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:106 errors:0 dropped:0 overruns:0 frame:0
TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19173 (18.7 KiB) TX bytes:6094 (5.9 KiB)

wlan0 Link encap:Ethernet HWaddr D8:FE:E3:E8:A4:4F
inet addr:192.168.1.112 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::dafe:e3ff:fee8:a44f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2839 errors:0 dropped:1414 overruns:0 frame:0
TX packets:240 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:501630 (489.8 KiB) TX bytes:40490 (39.5 KiB)

我只知道eth0是RJ45，wlan0是無線網卡D-LINK DWA-121



請問要怎麼做才能同時無線ssh又連上無線網路上網呢？

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