It seems I might have made a mistake in my virtual network configuration. I tried ssh'ing to the gateway 10.0.0.1, and lo and behold, an ssh server running. Turns out it was my virtualization host listening on that address. A reboot of the router must have made it also on that address (is that possible?) temporarily.
> virsh net-dumpxml lan_priv
<network connections='2'>
<name>lan_priv</name>
<uuid>567ca017-512e-4211-87c7-ae0193806d20</uuid>
<bridge name='virbr1' stp='on' delay='0'/>
<mac address='52:54:00:2e:3d:0f'/>
**<ip address='10.0.0.1' netmask='255.255.240.0'>**
^^^^^ (oops)
</ip>
</network>
I believe it should be **"10.0.0.0"** for the network ip address.
I'll clean everything up and report the results.