The current network setup has weird side effects.
Normally, QEMU would automatically make the guest set up necessary
IP routes through its integrated DHCP server.
When running QEMU through pmbootstrap they are missing.
First, we change the DHCP range in a way that could potentially
conflict with default IPs used for QEMU's own services:
QEMU has the default gateway at <network>.2, and DNS at <network>.3.
We set the DHCP range to start at <network>.1, and will therefore
potentially give out one of these addresses (QEMU's default starts at
<network>.15).
See: https://wiki.qemu.org/Documentation/Networking#User_Networking_.28SLIRP.29
In practice this does not cause immediate problems because there is
just one guest in the network, and it will get <network>.1, which is
not used by QEMU.
More problematic is that we start a DHCP server from postmarketOS
at the same time (normally used for the USB network) and there are
actually two DHCP servers running at the same time.
QEMU's user networking is local to the process, therefore it is not
possible to access the QEMU guest through its IP from the host.
That's why we have the port forwardings so you can access SSH at
localhost:2222 for example.
In practice the network interface in the QEMU guest is only used to
access the Internet. For that, we don't care which IP address we get,
we just want to get a working setup (IP + routes + DNS) automatically
through DHCP.
To make this work nicely we just need to stop trying to fit QEMU's
network setup into our usual setup for USB networking. When we remove
the custom DHCP option, and avoid starting a DHCP server from postmarketOS
(deviceinfo_disable_dhcpd) everything is suddenly working fine. :)
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