add a wifi AP for armbian box (by quqi99)

Posted 2022-12-04 quqi99

作者：张华 发表于：2022-03-26
版权声明：可以任意转载，转载时请务必以超链接形式标明文章原始出处和作者信息及本版权声明
( http://blog.csdn.net/quqi99 )

无线网卡的5种模式:

• AP/master, 当做一个无线接入点来使用
• Managed/Client, 作为客户端接入主AP https://blog.csdn.net/hailangnet/article/details/118110720
• Ad-Hoc/adhoc, 与AP的区别是Ad-hoc是无中心点对点的, 没有配置成Ad-Hoc模式的话则多个子设备之间的通信需要通过AP的转发.
• WDS(wireless distribution system)
• Monitor

#iwconfig wlan0 mode ap
root@OneCloud:~# iw list |grep 'Supported interface modes' -A5
	Supported interface modes:
		 * IBSS
		 * managed
		 * AP
		 * P2P-client
		 * P2P-GO
root@OneCloud:~# ethtool -i wlan0|grep driver
driver: rtl8188eu

enable ad-hoc

有NAT和bridge两种模式:

• NAT, 不使用br0, 直接在wlan0上设置IP, 之后得设置NAT, 有独立的网段. 这里是这种 - https://blog.csdn.net/cupidove/article/details/38845049
• Bridge, 使用br0, 将eth0与wlan0都在加入到br0, 这种模式整个armbian box延伸作为主路由的一个AP使用(网络从主路由分配) - https://www.cnblogs.com/wxfy/p/10879858.html

cat << EOF | tee /etc/network/interfaces.d/wlan0
allow-hotplug wlan0
iface wlan0 inet static
address 192.168.98.1
netmask 255.255.255.0
network 192.168.98.0
broadcast 192.168.98.255
gateway 192.168.99.1
dns-nameservers 192.168.99.1
#wireless-essid armbianAP
#wireless-mode ad-hoc
#wireless-channel 11
EOF
ifdown wlan0 && ifup wlan0

这里没有在/etc/network/interfaces.d/wlan0中设置wireless-essid之内的参数,改到/etc/hostapd.conf中来设置, 在默认的基础上添加了下列项, 最重要的是要注释掉briage=br0

cat << EOF | tee /etc/hostapd.conf
interface=wlan0
driver=nl80211
ssid=armbianAP
channel=6
hw_mode=g
ignore_broadcast_ssid=0
auth_algs=1
wpa=3
wpa_passphrase=password
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
#bridage=br0
EOF

dhcp

或者使用下列配置参数来配置:

cat << EOF | tee /etc/dnsmasq.conf
interface=wlan0
listen-address=192.168.98.1
dhcp-range=192.168.98.2,192.168.98.100,120h
dhcp-option=6,192.168.98.1
EOF
systemctl enable dnsmasq && systemctl start dnsmasq

或者禁用掉dnmsaq服务后来手工配置:

systemctl disable dnsmasq && systemctl stop dnsmasq
vim /etc/rc.local
dnsmasq -i wlan0 --dhcp-range=192.168.98.100,192.168.98.109,480h 2>&1 &

router

cat << EOF | tee -a /etc/sysctl.conf
net.ipv4.ip_forward = 1
EOF
sysctl -p

iptables -A FORWARD -i wlan0 -o eth0 -s 192.168.98.0/24 -m state --state NEW -j ACCEPT
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
apt install iptables-persistent -y
dpkg-reconfigure iptables-persistent
systemctl enable netfilter-persistent

dns[可选]

只配置dhcp就可以了, 不一定非要配置dns, 因为/etc/network/interfaces.d/wlan0中已经配置dns项了

cat << EOF | tee /etc/resolvconf/resolv.conf.d/head
nameserver 192.168.99.1
EOF
systemctl disable systemd-resolved && systemctl stop systemd-resolved
rm -rf /etc/resolv.conf && ln -s /etc/resolvconf/run/resolv.conf /etc/resolv.conf
systemctl restart resolvconf

问题

能连上, 但不稳定, 动不动说没网了. 是因为之前照网上抄的使用了:

iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

而应该是：

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE