我制作了一个 Ubuntu 接入点。该 AP 基于 Ubuntu 服务器 18.04。最初它可以工作，但过了一段时间（重启几次后）我总是可以连接到 AP，但我无法再访问互联网，也无法使用 SSH 终端（DHCP 可以工作，似乎是路由问题）。在物理连接到家庭路由器的 enp1s0 接口上执行 ping 操作可以工作。我使用此程序使 AP 工作（任何帮助都将不胜感激）：
sudo apt update
sudo apt upgrade
软件包安装：
sudo apt install ifupdown
sudo apt install bridge-utils
网络接口配置：
sudo nano /etc/network/interfaces
auto lo
iface lo inet loopback
allow-hotplug enp1s0
iface enp1s0 inet static
address 192.168.1.4
netmask 255.255.255.0
network 192.168.1.0
gateway 192.168.1.1
allow-hotplug enp2s0
iface enp2s0 inet manual
auto wlp3s0
iface wlp3s0 inet manual
auto br0
iface br0 inet static
address 192.168.2.1
netmask 255.255.255.0
network 192.168.2.0
broadcast 192.168.2.255
bridge_ports enp2s0 wlp3s0
bridge_stp off
bridge_fd 0
bridge_maxwait 0
删除 NETPLAN：
systemctl stop systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl disable systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl mask systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
apt-get --assume-yes purge nplan netplan.io
启用网络：
sudo systemctl unmask networking
sudo systemctl enable networking
sudo systemctl restart networking
DNS 服务器配置：
sudo nano /etc/systemd/resolved.conf
....
DNS=8.8.8.8 8.8.4.4
....
sudo systemctl restart systemd-resolved
启用 IP 转发：
sudo nano /etc/sysctl.conf
重启服务器：
sudo reboot
测试 DNS：
nslookup www.google.it
切入点：
数据包安装：
sudo apt install wireless-tools
sudo apt install hostapd
接入点配置：
sudo nano /etc/hostapd/hostapd.conf
interface=wlp3s0
driver=nl80211
bridge=br0
country_code=BO
ssid=APNAME
hw_mode=g
channel=10
logger_syslog=-1
wmm_enabled=1
macaddr_acl=0
auth_algs=1
wpa=2
wpa_passphrase=APPASSWORD
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
接入点测试：
sudo hostapd /etc/hostapd/hostapd.conf
启用接入点服务：
sudo nano /etc/default/hostapd
DAEMON_CONF="/etc/hostapd/hostapd.conf"
sudo systemctl unmask hostapd
sudo systemctl enable hostapd
sudo systemctl start hostapd
sudo systemctl status hostapd
DHCP 服务器：
软件包安装：
sudo apt install isc-dhcp-server
sudo nano /etc/default/isc-dhcp-server
INTERFACESv4="br0"
sudo nano /etc/dhcp/dhcpd.conf
option domain-name "domotica.org";
option domain-name-servers 8.8.8.8, 8.8.4.4;
ddns-update-style none;
authoritative;
subnet 192.168.2.0 netmask 255.255.255.0 {
range 192.168.2.4 192.168.2.254;
option domain-name-servers 8.8.8.8;
option domain-name "domotica.org";
option subnet-mask 255.255.255.0;
option routers 192.168.2.1;
option broadcast-address 192.168.2.255;
option ntp-servers 192.186.2.1;
option netbios-name-servers 192.168.2.1;
option netbios-node-type 2;
default-lease-time -1;
max-lease-time -1;
}
启用 DHCP 服务器：
sudo systemctl start isc-dhcp-server
sudo systemctl enable isc-dhcp-server
路由：
sudo iptables -t nat -A POSTROUTING -o enp1s0 -j MASQUERADE
sudo apt install iptables-persistent
Sae IPV4 和 IPV6
重启 HUB