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Is a bad practice to have multiple eth on the same subnet on linux from routing point of view. It can be done with some dirty workarounds but it is not recommanded. Instead of issuing nova attach-interface, you should be adding another ip to the first port with nova add-fixed-ip. This way you will have only one interface on the subnet and can create multiple veth on it for multiple IP's (eg eth0:1, eth0:2 and so on).

Alternativly you can create the port using neutron prior to booting and set as many ip's on the port as necessary and then boot up the instance with the created port!