Here is one way to do it,
$ lxc network edit lxdbr0
(opens up a text editor)
It should show you the config: section that looks like
config:
ipv4.address: 10.50.253.1/24
ipv4.nat: "true"
ipv6.address: fd42:cba6:557e:1a5f::1/64
ipv6.nat: "true"
Change as follows:
config:
ipv4.address: 10.50.253.1/24
ipv4.nat: "true"
ipv6.address: fd42:cba6:557e:1a5f::1/64
ipv6.nat: "true"
raw.dnsmasq: |-
no-hosts
expand-hosts
dhcp-ttl=3600
Alternatively, you can do:
$ lxc network get lxdbr0 raw.dnsmasq
$ echo -e "no-hosts\nexpand-hosts" | lxc network set lxdbr0 raw.dnsmasq -
$ lxc network get lxdbr0 raw.dnsmasq
no-hosts
expand-hosts