[Dnsmasq-discuss] Bug in systemd/dhcp scripts that affects dnsmasq

[Bob Vincent]

I've submitted an Ubuntu bug-report here:

https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1797602

*Problem*:


- systemd breaks resolvconf-dependent DNS

*Test case:*


- Install dnsmasq with systemd.

*Result*:

- The script in /etc/dhcp/dhclient-enter-hooks.d/resolvconf defines the
make_resolv_conf() function to pass DHCP information to the
/sbin/resolvconf program.
- The script in /etc/dhcp/dhclient-enter-hooks.d/resolved redefines the
make_resolv_conf() function to write DHCP information to
/run/systemd/resolved.conf.d/isc-dhcp-v4-$interface.conf
- As a result, resolvconf never runs, and dnsmasq never receives the
DHCP-supplied nameservers.
- Therefore, DNS resolution is broken.

*Expected result*:

- DHCP-supplied nameservers should be passed to both resolvconf and to
systemd.

*Workaround*:

- Use the 127.0.0.53 address for the systemd resolver as the dnsmasq
upstream server.