[Qemu-discuss] macvlan, host routing between two different subnets

[Fabrizio Pollastri]

Hi,
I am using macvtap/macvlan devices to have full connectivity between
host, guests and outside network.
All is fine and easy when all ips belong to the same subnet.
Unfortunately, my configuration have two subnets, so my question is: is
it possible to have the host machine to perform routing between the two
subnets from packets originating both from inside guests and outside
network?

Let suppose to have the following configuration.

subnet 1    1.1.1.0/24 used for guests and host
subnet 2    2.2.2.0/24 external subnet, secondary address on host eth0

host /etc/network/interfaces:
--------------------------------------
auto eth0
iface eth0 inet static
  address 1.1.1.1
  netmask 255.255.255.0
  gateway 1.1.1.254

auto eth0:0
iface eth0:0 inet static
  address 2.2.2.1
  netmask 255.255.255.0

auto macvlan0
iface macvlan0 inet manual
  pre-up ip route flush default
  pre-up ip route flush 1.1.1.0/24
  pre-up ip link add link eth0 name macvlan0 type macvlan mode bridge
  pre-up ip address add 1.1.1.0/24 dev macvlan0
  pre-up ip address add 1.1.1.2/32 dev macvlan0
  post-down ip link delete macvlan0

guest /etc/network/interfaces:
----------------------------------------
....
auto eth0
iface eth0 inet static
  address 1.1.1.3
  netmask 255.255.255.0
  gateway 1.1.1.2
...


Thanks for any help.

Fabrizio