I can't ping to default gateway over usb connection

[Jin Tak Lee]

My BBB is connected to my Windows 10 Host pc over usb.

It is currently not pinging to default gw 192.168.7.1 even after I typed 'route add default gw 192.168.7.1'.

Here is my connection setting over usb.

usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.7.2  netmask 255.255.255.252  broadcast 192.168.7.3

        inet6 fe80::76e1:82ff:fe8d:c9a9  prefixlen 64  scopeid 0x20<link>

        ether 74:e1:82:8d:c9:a9  txqueuelen 1000  (Ethernet)

        RX packets 4093  bytes 471965 (460.9 KiB)

        RX errors 0  dropped 6  overruns 0  frame 0

        TX packets 3354  bytes 506179 (494.3 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Can anyone explain why ping doesn't work?