Hostapd with DHCP

Products Support DragonBoard410c
#1

Hello, I’m trying to create an AP with hostapd, but with no success, maybe because DHCP configuration.
Does anyone know how to configure this correctly?

Thanks in advance.

#2

Hello Luiz,
I would try it static if you suspect DHCP to be the problem.
You can set it in the /etc/network/interfaces.
Regards

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#3

It worked, with static IP, thanks for the reply, after that I used dnsmasq to set DHCP instead of ISP-DHCP and worked too.

#4

1. Create a dedicated interface ap0 for AP mode (optional, you can use wlan0):

iw dev wlan0 interface add ap0 type __ap

Prevent NetworkManager to take care of the interface (/etc/NetworkManager/conf.d/ignore-ap0.conf):

[keyfile]
unmanaged-devices=interface-name:ap0

2. Configure systemd to auto set IP of ap0 interface:

create /systemd/network/42-ap0.network with the following content:

[Match]
Name=ap0

[Network]
Address=192.168.42.1/24

3. Create DHCP configuration for clients

create dnsmasq.d/dnsmasq-mydhcp.conf

listen-address=::1,127.0.0.1,192.168.42.1
domain-needed
bogus-priv
filterwin2k
localise-queries
local=/lan/
expand-hosts
no-negcache
resolv-file=/tmp/resolv.conf.auto
dhcp-authoritative
dhcp-leasefile=/tmp/dhcp.leases
read-ethers
# Plage DHCP
dhcp-range=192.168.42.100,192.168.42.150,12h
# Netmask
dhcp-option=1,255.255.255.0
# Route
dhcp-option=3,192.168.42.1

then restart dnsmasq

systemctl restart dnsmasq

  1. Create hostapd configuration (Wifi AP mode)

Create /etc/hostapd.conf with the following content:

interface=ap0
driver=nl80211
ssid=dragonAP
hw_mode=g
ieee80211n=1
ht_capab=[DSSS_CCK-40][SHORT-GI-20]
channel=1

  1. stop ‘client’ interface

    ifconfig wlan0 down

  2. Run hostapd:

    ifconfig ap0 up
    hostapd hostapd.conf

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