proc CreateIpv4StackNgpf { ethernetStackObj ipv4StackName } {
    puts "\nCreateIpv4StackNgpf: $ethernetStackObj : $ipv4StackName"
    set ipv4StackObj [ixNet add $ethernetStackObj ipv4]
    ixNet setMultiAttribute $ipv4StackObj \
	-name $ipv4StackName

    ixNet commit
    return [lindex [ixNet remapIds $ipv4StackObj] 0]
}