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root# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether f2:d2:3a:03:ab:19 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.101/24 brd 192.168.0.255 scope global dynamic noprefixroute eth0
valid_lft 7066sec preferred_lft 7066sec
inet6 fe80::77be:d660:47ad:52bd/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: wlx90de80682540: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 90🇩🇪80:68:25:40 brd ff:ff:ff:ff:ff:ff
inet6 fe80::92de:80ff:fe68:2540/64 scope link
valid_lft forever preferred_lft forever
## 分配ip地址
ip address add 192.168.66.1/24 dev wlx90de80682540
## 设置转发规则
iptables -t nat -A POSTROUTING -s 192.168.66.0/24 -o eth0 -j MASQUERADE
## 保存转发规则
apt install iptables-persistent (armbian)
## 允许包转发
/etc/sysctl.d/30-ipforward.conf：
net.ipv4.ip_forward=1
net.ipv6.conf.default.forwarding=1
net.ipv6.conf.all.forwarding=1
##如果存在ufw
/etc/default/ufw : default_forward_policy = "accept"
/etc/ufw/sysctl.conf : net/ipv4/ip_forward=1 \n net/ipv6/conf/default/forwarding=1 \n net/ipv6/conf/all/forwarding=1
## udhcpd
/etc/default/udhcpd:
start 192.168.66.2
end 192.168.66.254
opt dns 192.168.66.1 223.5.5.5
option subnet 255.255.255.0
opt router 192.168.66.1
option dns 192.168.66.1
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