Estas são as saídas que recebo quando digito:
systemctl status dnsmasq
● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2017-12-14 08:49:31 UTC; 54min ago
Process: 590 ExecStart=/etc/init.d/dnsmasq systemd-exec (code=exited, status=2)
Process: 569 ExecStartPre=/usr/sbin/dnsmasq --test (code=exited, status=0/SUCCESS)
Dec 14 08:49:30 raspberrypi systemd[1]: Starting dnsmasq - A lightweight DHCP and caching DNS server...
Dec 14 08:49:30 raspberrypi dnsmasq[569]: dnsmasq: syntax check OK.
Dec 14 08:49:31 raspberrypi dnsmasq[590]: dnsmasq: failed to create listening socket for 10.0.20.1: Cannot assign requested address
Dec 14 08:49:31 raspberrypi systemd[1]: dnsmasq.service: Control process exited, code=exited status=2
Dec 14 08:49:31 raspberrypi systemd[1]: Failed to start dnsmasq - A lightweight DHCP and caching DNS server.
Dec 14 08:49:31 raspberrypi systemd[1]: dnsmasq.service: Unit entered failed state.
Dec 14 08:49:31 raspberrypi systemd[1]: dnsmasq.service: Failed with result 'exit-code'.
Funciona bem quando inicio o serviço manualmente.
Eu configurei um ip estático assim:
sudo nano /etc/dhcpcd.conf
interface wlan0
static ip_address=10.0.20.1/24
static routers=10.0.20.0