iwd ap mode

/etc/iwd/main.conf

[General]
EnableNetworkConfiguration=true

sudo mkdir -p /var/lib/iwd/ap/

/var/lib/iwd/ap/<ssid>.ap 

[Security]
Passphrase=password123

[IPv4]
Address=192.168.250.1
Gateway=192.168.250.1
Netmask=255.255.255.0
DNSList=8.8.8.8 

[iwd] device wlan0 set-property Mode ap

[iwd]# ap wlan0 start-profile test 

sudo sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
# sudo iptables -t nat -A POSTROUTING -s 192.168.250.0/24 -j MASQUERADE

network connection (wlan0_sta) itself and for the software AP/hostapd "wireless repeater(wlan0_ap) 

iw dev wlan0 interface add wlan0_sta type managed addr 12:34:56:78:ab:cd  

iw dev wlan0 interface add wlan0_ap  type managed addr 12:34:56:78:ab:ce

Wi-Fi link layer

sudo pacman -S hostapd

/etc/hostapd/hostapd.conf

interface=wlan0_ap
bridge=br0

# SSID to be used in IEEE 802.11 management frames
ssid=YourWiFiName
# Driver interface type (hostap/wired/none/nl80211/bsd)
driver=nl80211
# Country code (ISO/IEC 3166-1)
country_code=US

# Operation mode (a = IEEE 802.11a (5 GHz), b = IEEE 802.11b (2.4 GHz)
hw_mode=g
# Channel number
channel=7
# Maximum number of stations allowed
max_num_sta=5

# Bit field: bit0 = WPA, bit1 = WPA2
wpa=2
# Bit field: 1=wpa, 2=wep, 3=both
auth_algs=1

# Set of accepted cipher suites; disabling insecure TKIP
wpa_pairwise=CCMP
# Set of accepted key management algorithms
wpa_key_mgmt=WPA-PSK
wpa_passphrase=Somepassphrase

# hostapd event logger configuration
logger_stdout=-1
logger_stdout_level=2

# Uncomment and modify the following section if your device supports 802.11n
## Enable 802.11n support
#ieee80211n=1
## QoS support
#wmm_enabled=1
## Use "iw list" to show device capabilities and modify ht_capab accordingly
#ht_capab=[HT40+][SHORT-GI-40][TX-STBC][RX-STBC1][DSSS_CCK-40]

systemctl start hostapd.service

nano /etc/systemd/system/hostapd.service.d/override.conf

[Unit]
BindsTo=sys-subsystem-net-devices-wlan0.device
After=sys-subsystem-net-devices-wlan0.device

Network configuration

ip link add name bridge_name type bridge

ip link set dev bridge_name up

ip link set eth1 master bridge_name

bridge link

nano /etc/hostapd/hostap.conf

interface=wlan0

driver=nl80211

ssid=Put_your_desried_name_here

hw_mode=g

channel=11

wpa=3

wpa_passphrase=Put_here_your_desired_password

wpa_key_mgmt=WPA-PSK

wpa_pairwise=TKIP CCMP

wpa_ptk_rekey=600

src:

https://wiki.archlinux.org/title/Network_bridge 

https://jatindhankhar.in/articles/hostapd-wifi/   

https://iwd.wiki.kernel.org/ap_mode 

https://wiki.archlinux.org/title/Software_access_point