# Pastebin MGjtTcwD
Hi Team, I have setup devstack with PUBLIC_INTERFACE=eth1(dedicated interface for br-ex), all went fine, spun up VMs.
Now am looking to change interface from eth1 to eth2, I've attempted to del-port and add-port using ovs-vsctl command on br-ex bridge.
But the moment, I removed old interface and add new interface, devstack VMs lost external connection and unable to ping to gateway.
What's the best approach to change the interfaces contributing to br-ex bridge post installation ?