[systemd-devel] Understanding DHCP, DNS and IPMasquerade

[Lennart Poettering]

On Fri, 12.06.15 17:32, Johannes Ernst (johannes.ernst at gmail.com) wrote:

> 
> I was expecting:
>  * container gets an IP address from host in some new subnet: WORKS, e.g 10.0.0.2
>  * container can route to upstream via IPMasquerade: WORKS, after manual 'modprobe iptable_nat'
>  * container gets the DNS server from the host: FAILS:
> /etc/resolv.conf points to Google name servers instead (8.8.8.8 etc)

This is a missing feature of the DHCP server in networkd: it should be
able to propagate the DNS servers it learned on the external networks
automatically in a smart way. It's on the TODO list to add this.

>  * host and container can ping test (if test is the name of the
>  * container machine per machinectl): FAILS, neither can

Do you have nss-mymachines enabled in /etc/nsswitch.conf?

Does pinging via the IP addresses work? 

Lennart

-- 
Lennart Poettering, Red Hat