**** Original configuration
cat /etc/network/interfaces
auto eth0
iface eth0 inet static
dns-nameservers 10.245.168.2
gateway 10.245.168.1
address 10.245.168.11/21
mtu 1500
auto eth1
iface eth1 inet manual
mtu 1500
auto eth2
iface eth2 inet manual
mtu 1500
auto eth3
iface eth3 inet manual
mtu 1500
auto eth1.2667
iface eth1.2667 inet static
dns-nameservers 10.245.168.2
address 10.245.184.2/24
vlan-raw-device eth1
mtu 1500
vlan_id 2667
auto eth1.2668
iface eth1.2668 inet static
dns-nameservers 10.245.168.2
address 10.245.185.1/24
vlan-raw-device eth1
mtu 1500
vlan_id 2668
auto eth1.2669
iface eth1.2669 inet static
dns-nameservers 10.245.168.2
address 10.245.186.1/24
vlan-raw-device eth1
mtu 1500
vlan_id 2669
auto eth1.2670
iface eth1.2670 inet static
dns-nameservers 10.245.168.2
address 10.245.187.2/24
vlan-raw-device eth1
mtu 1500
vlan_id 2670