Hi all,

I'm trying to get some dnsmaq stuff working on my desktop machine (Kubuntu). I've got a wifi interface that is my default (and only) route to the Internet.

I've also got a wired ethernet interface that I want to use to: - provide DHCP service to a headless server - provide NAT to that headless server so that it can connect to the internet

I've setup a dnsmasq config (using the defaults, but with some tweaks), but whilst it does actually serve DHCP to a laptop (for testing), it appears to set 2 default routes on my desktop, and I can no longer get onto the Internet.

Routing table while dnsmasq was running:

srdjan@serenity:~$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default dsldevice.lan 0.0.0.0 UG 100 0 0 enp37s0 default dsldevice.lan 0.0.0.0 UG 600 0 0 wlp38s0 link-local 0.0.0.0 255.255.0.0 U 1000 0 0 docker0 172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0 192.168.1.0 0.0.0.0 255.255.255.0 U 600 0 0 wlp38s0 dsldevice.lan 0.0.0.0 255.255.255.255 UH 100 0 0 enp37s0 192.168.2.0 0.0.0.0 255.255.255.0 U 100 0 0 enp37s0

I'm not sure this is correct. Dhcp-option 3 and 6 were left as default, but I would have expected the impact of those to be felt on the client machine trying to get the IP address, and not the "server" (desktop). Perhaps option 3 might make sense to set to the same address as the wifi router?

Once I tore down both enp37s0 and wlp38s0, and reconnected on wifi using the KDE network manager, did I manage to get back onto the internet.

Of note, the default config uses: interface=enp37s0 port=0 dns-range that is on a different network to the usual wifi one

Has anyone got any suggestions please on what plainly stupid thing I'm doing with my setup?

Thanks, Srdjan