主机不能联网
一 查看当前ip ping路由
ifconfig wlan0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.78 netmask 255.255.255.0 broadcast 192.168.2.255
ping 192.168.2.1
查看是否能ping通
二 查看路由表
route -n
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
这种情况缺默认网关，添加网关
route add default gw 192.168.2.1
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 wlan0
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
三 查看 /etc/resolv.conf dns解析
cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "resolvectl status" to see details about the actual nameservers.
nameserver 192.168.0.1
dns解析为空或缺失对应 添加一行
nameserver 192.168.2.1
192.168.2.1修改为对应的路由地址
