Wifi Host AP with Slackware Linux

Requirements

Checking for compatible drivers as defined at http://w1.fi/hostapd/

lsmod | grep mac80211

What 802.11 standards is the device able to talk? N or G?

lshw -c network | egrep 'product|802.11'

Setting up an IP for that AP service on Slackware

vi /etc/rc.d/rc.inet1

ifconfig wlan0 x.x.x.254/24 up

or Ubuntu w/o netplan

vi /etc/network/interfaces

auto wlan0
    iface wlan0 inet static
    address x.x.x.254/24
    dns-nameservers 208.67.222.222 208.67.220.220
    dns-search as7lab.lan

Install

Slackware

slackpkg search hostapd

Ubuntu

apt install hostapd
apt install isc-dhcp-server

Setup

I guess we are choosing g here, but n might also be fine,

cp /usr/share/doc/hostapd/examples/hostapd.conf /etc/hostapd/hostapd.conf.dist
vi /etc/hostapd/hostapd.conf

interface=wlan0
#driver=nl80211

#hw_mode=n
hw_mode=g
#channel=1
ssid=as7lab

wpa=2
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP
wpa_passphrase=12345678

Ready to go

tail -n0 -F /var/log/*

Slackware

/etc/rc.d/rc.hostapd stop
/etc/rc.d/rc.hostapd start

Ubuntu

systemctl unmask hostapd
systemctl status hostapd
systemctl start hostapd

NAT & DHCP

Setting up the network for that purpose

sysctl -w net.ipv4.ip_forward=1
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

mv /etc/dhcpd.conf /etc/dhcpd.conf.dist
vi /etc/dhcpd.conf
#mv /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.dist
#vi /etc/dhcp/dhcpd.conf

option domain-name "as7lab.lan";
option domain-search "as7lab.lan";
option domain-name-servers 208.67.222.222, 208.67.220.220;

default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
authoritative;

subnet x.x.x.0 netmask 255.255.255.0 {
    option subnet-mask 255.255.255.0;
    option routers x.x.x.254;
    range x.x.x.100 x.x.x.199;
}

Slackware

pkill dhcpd
dhcpd -q wlan0

Ubuntu

vi /etc/default/isc-dhcp-server

INTERFACESv4="wlan0"
INTERFACESv6="wlan0"

systemctl restart isc-dhcp-server