DHCP from dnsmasq doesn't work without setting dhcp-range in conf file

Installing and Using OpenWrt Network and Wireless Configuration
1

After updgrading to the latest version of dnsmaq I found that DHCP server doesn't work if you don't set explicitly in dnsmaq.conf dhcp-range and list interface in config/dhcp section.
Previously were was no need to add list interface and usage of dnsmasq.conf was completely optional.
I suppose this might be considered as a bug.
Expected behavior:

  • use of dnsmasq.conf should be completely optional for basic configuration
  • Probably use of list interface should be also optional as soon as I configured DHCP for individual interface section.

My configs:
/etc/confg/dhcp


config dnsmasq
	option domainneeded '1'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option local '/lan/'
	option domain 'lan'
	option expandhosts '1'
	option nonegcache '0'
	option authoritative '1'
	list interface 'br-lan' # doesn't work without this line
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option resolvfile '/tmp/resolv.conf.auto'
	option nonwildcard '0'
	option localservice '0'
	option boguspriv '0'

config dhcp 'lan'
	option interface 'lan' # I'm already have this section why I need list interface in the section above?
	option start '100'
	option limit '150'
	option leasetime '12h'
	option dhcpv6 'server'
	option ra 'server'
	option ra_management '1'

config dhcp 'wan'
	option interface 'wan'
	option ignore '1'

config odhcpd 'odhcpd'
	option leasefile '/tmp/hosts/odhcpd'
	option leasetrigger '/usr/sbin/odhcpd-update'
	option maindhcp '1'

config host
	option name 'ubi1'
	option dns '1'
	option mac '80:2a:a8:XX:XX:XX'
	option ip '192.168.1.11'
	option leasetime '3d'

/etc/dnsmasq.conf

interface=eth0 # not sure if really needed
dhcp-range=192.168.1.100,192.168.1.250,12h # doesn't work without it

My router NetGear WNDR3700v2.
FW: LEDE Reboot 17.01.4 r3560-79f57e422d / LuCI lede-17.01 branch (git-18.098.72829-575e327)
dnsmasq - 2.78-6

2

This line tells dnsmasq what Interface(s) to listen on. Also, the Wiki says this should likely say "lan" not "br-lan." **The WIki also states omitting this line should simply result in dnsmasq listening on all interfaces...so that is an issue.

This line explicitly associates the defined address pool.

See: https://wiki.openwrt.org/doc/uci/dhcp

I'm not sure that's accurate. The parameters: start, limit, interface and leasetime are required options for each DHCP scope. The file may have been generated by default.

3

start, limit and leasetime already defined in /etc/config/dhcp,
But without adding dhcp-range into dnsmasq.conf dhcp doesn't work.
I have checked this several times, when I remove this line from dnsmasq.conf I stop receiving leases.
list interface previously was not needed, I migrated my config from Barier Braker and reflashed router several times, so I suppose some defaults have changed. Maybe this is right change, it was just not expected.