On Tue, Apr 14, 2020 at 12:45 pm, Adam Williamson <[email protected]> wrote:
Doesn't NetworkManager already broadly address both of these on all
installations where it's used (which is all Fedora installs by
default)?

I don't think so, no.

As far as I know, NetworkManager does not have a DNS cache. The only way to implement one systemwide would be to write a glibc NSS plugin. Otherwise, how would glibc be able to talk to NetworkManager to use the cached results?

Then the description of multi-VPN scenario is written based on the status quo with NetworkManager already installed and enabled. NetworkManager has three DNS backends: default (nss-dns, what we use currently), dnsmasq, and systemd-resolved. The default backend just does the wrong thing and cannot be fixed. When either dnsmasq or systemd-resolved is in use, NetworkManager will go ahead and do the right thing by telling dnsmasq/systemd-resolved which network interfaces should be used to resolve which hostnames. I consulted with the NetworkManager developers and they recommended systemd-resolved over dnsmasq, although I understand that dnsmasq is good too.

Michael

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