I did another test:
* I unplugged the network cable so that the ltsp-server didn't have an ip.
* I ran `service dnsmasq restart`.
* I plugged the network cable back in.
* ...and the problem came back again, i.e. dnsmasq replied on invalid range.
This again suggests that it's some kind of wrong initialization when the network is down while dnsmasq starts.
Using dnsmasq 2.75-1ubuntu0.16.04.1 on i386 architecture.
I did another test:
* I unplugged the network cable so that the ltsp-server didn't have an ip.
* I ran `service dnsmasq restart`.
* I plugged the network cable back in.
* ...and the problem came back again, i.e. dnsmasq replied on invalid range.
This again suggests that it's some kind of wrong initialization when the network is down while dnsmasq starts.
Using dnsmasq 2.75-1ubuntu0. 16.04.1 on i386 architecture.