Configure local Systemd-resolved DNS Resolver for Company Domains behind VPN

To send queries for the company internal (sub)-domains to the company DNS resolvers behind the VPN, the resolver can be configured with the following commands:

# Configure internal corporate domain name resolvers:
resolvectl dns tun0 192.0.2.53 192.0.2.54

# Only use the internal corporate resolvers for domain names under these:
resolvectl domain tun0 "~example.com"

# Not super nice, but might be needed:
resolvectl dnssec tun0 off

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