wifi和以太网同时连接时，其中一个无法ping 通

[captain]

主控：T113
SDK:longan_sdk
问题：如果同时连接了wifi和以太网，那么后连接的哪一个在ping时就会卡住

PING baidu.com (39.156.66.10) from 192.168.43.136 wlan0: 56(84) bytes of data.

1.单独连接wifi或者以太网时，都能ping通。
2.如果先接wifi 后连接以太网,当两个同时存在时。ping -I wlan0 baidu.com 能够ping通。但是 ping -I eth0 baidu.com 就不能ping通,卡在以下语句不动：

PING baidu.com (39.156.66.10) from 192.168.1.11 eth0: 56(84) bytes of data.

3.如果先接以太网 后连接 wifi ,当两个同时存在时。ping -I eth0 baidu.com 能够ping通。但是 ping -I wlan0 baidu.com 就不能ping通,卡在以下语句不动：

PING baidu.com (39.156.66.10) from 192.168.43.136 wlan0: 56(84) bytes of data.

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.11  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::bc93:c3ff:feb8:91ff  prefixlen 64  scopeid 0x20<link>
        inet6 240e:399:4da:1b40:bc93:c3ff:feb8:91ff  prefixlen 64  scopeid 0x0<global>
        ether be:93:c3:b8:91:ff  txqueuelen 1000  (Ethernet)
        RX packets 410  bytes 27816 (27.1 KiB)
        RX errors 0  dropped 286  overruns 0  frame 0
        TX packets 183  bytes 10615 (10.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 38  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 112  bytes 12544 (12.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 112  bytes 12544 (12.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.43.238  netmask 255.255.255.0  broadcast 192.168.43.255
        inet6 fe80::de44:6dff:fe13:3519  prefixlen 64  scopeid 0x20<link>
        inet6 240e:474:ff2c:d003:de44:6dff:fe13:3519  prefixlen 64  scopeid 0x0<global>
        ether dc:44:6d:13:35:19  txqueuelen 1000  (Ethernet)
        RX packets 44  bytes 13121 (12.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 29  bytes 3593 (3.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[creaznico]

@captain 你wifi的ip和eth的ip都不是同一个网段，也没设置掩码，先ping局域网，再做DNS