Hi.
I tried to use VLANs & Subnetting with Proxmox 4.2. I found this manual in the wiki:
https://pve.proxmox.com/wiki/Vlans
... and tried to follow it.
My /etc/network/interfaces looks like this:
auto lo
iface lo inet loopback
# Realtek r8169
iface eth0 inet manual
#bond0
iface eth1 inet...