networking - How to control IP ranges of Network Manager's hotspots? - Ask Ubuntu


a server has 2 wifi interfaces, both configured via network manager hotspots.

connected clients ips in ranges 10.42.0.0/24 , 10.42.1.0/24 (afaics via dnsmasq invoked nm). need able assign specific range specific interface. unfortunately, network manager assigns them unpredictably (so wlan0 may 10.42.0.0 today , 10.42.1.0 tomorrow; wlan1 gets remaining range) messes iptables because routing rules different these interfaces.

i tried dhcp-range= option in /etc/dnsmasq.conf (which wasn't present nm configures dnsmasq via command line) , other ideas can't find workable solution.

any thoughts on how can control ip range gets assigned interface?

you can determine used ipv4 subnet configuring 1 manual address, like

nmcli connection modify $shared_name ipv4.addresses 192.168.2.5/24

it's documented in man nm-settings, see ipv4.method.

/etc/networkmanager/dnsmasq.d using dnsmasq dns plugin, not use case of connection sharing. that, instead /etc/networkmanager/dnsmasq-shared.d -- @ least in recent versions of nm. shouldn't need that.


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