rk356x_sdk-linux5.10使用ubuntu22.04根文件系统，4G ping不通外网

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按照网址:https://wiki.t-firefly.com/Core- ... ile_linux5.10.html#
编译烧录后，4G模组，
1、可以识别到/dev/ttyUSB0~/dev/ttyUSB3

2、root@firefly:/# ifconfig -a
wwan0: flags=128<NOARP>  mtu 1500
        ether a2:80:e9:cc:56:c5  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1  bytes 56 (56.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

3、root@firefly:/# ifconfig wwan0 up
4、root@firefly:/# ifconfig
wwan0: flags=193<UP,RUNNING,NOARP>  mtu 1500
        inet6 fe80::a080:e9ff:fecc:56c5  prefixlen 64  scopeid 0x20<link>
        ether a2:80:e9:cc:56:c5  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3  bytes 168 (168.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

5、root@firefly:/# ping 8.8.8.8
ping: connect: Network is unreachable