Manual Network Connections

# Generate a configuration file and connecting to the AP
wpa_passphrase $ssid $passphrase > wifi-client.conf
sudo wpa_supplicant -i wlan0 -c wifi-client.conf            # -B for background
# Get & verify the IP address
sudo dhclient wlan2
ip addr show wlan2

wpa_supplicant configuration for a WPA or WPA2-PSK network

WPA

network={
  ssid="home_network"
  scan_ssid=1
  psk="correct battery horse staple"
  key_mgmt=WPA-PSK
}

Open AP

network={
	ssid="$ESSID"
	key_mgmt=NONE
	scan_ssid=1
}

WEP

network={
  ssid="wifi-old"
  key_mgmt=NONE
  wep_key0=$PASSWORD
  wep_tx_keyidx=0
}

WPA3-SAE

network={
    ssid="wifi-management"
    psk="chocolate1"
    key_mgmt=SAE
    ieee80211w=2
}

Setting up an Access Point

1. Configure Internet access on the system.
2. Set up a static IP for the wireless interface.
3. DHCP server set up, to provide automatic IP configuration for Wi-Fi clients.
4. Add routing to provide Internet access to the Wi-Fi clients.
5. Configure the Wi-Fi interface in AP mode.

=> # 1. Internet Access : 
sudo iw list            # search for Supported interface modes: * AP
=> # 2. Static IP on Access Point Wireless Interface
sudo ip link set wlan0 up
sudo ip addr add 10.0.0.1/24 dev wlan0
=> # 3. DHCP Server
sudo dnsmasq --conf-file=dnsmasq.conf
sudo tail /var/log/syslog | grep dnsmasq            # Checking for dnsmasq in syslog
=> # 4. Routing
echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward     # Enabling IP forwarding
sudo nft add table nat
sudo nft 'add chain nat postrouting { type nat hook postrouting priority 100 ; }'
sudo nft add rule ip nat postrouting oifname "eth0" ip daddr != 10.0.0.1/24 masquerade
=> # 5. Access Point Mode
sudo hostapd hostapd.conf

dnsmasq configuration file

# Main options
# http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html
domain-needed
bogus-priv
no-resolv
filterwin2k
expand-hosts
domain=localdomain
local=/localdomain/
# Only listen on this address. When specifying an 
# interface, it also listens on localhost.
# We don't want to interrupt any local resolution
listen-address=10.0.0.1

# DHCP range
dhcp-range=10.0.0.100,10.0.0.199,12h
dhcp-lease-max=100
# Router: wlan0
dhcp-option=option:router,10.0.0.1
dhcp-authoritative

# DNS: Primary and secondary Google DNS
server=8.8.8.8
server=8.8.4.4

hostapd configuration file : hostapd.conf

interface=wlan0
ssid=BTTF
channel=11

# 802.11n
hw_mode=g
ieee80211n=1

# WPA2 PSK with CCMP
wpa=2
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP
wpa_passphrase=GreatScott