proc ConfigIpv4AddressNgpf { ipv4StackObj start {step 0.0.0.1} {direction increment} } {
    puts "\nConfigIpv4AddressNgpf: $ipv4StackObj : start=$start step=$step direction=$direction"
    set ipv4AddressObj [ixNet getAttribute $ipv4StackObj -address]
    ixNet setMultiAttribute $ipv4AddressObj \
	-clearOverlays false \
	-pattern counter
    ixNet commit

    set ipv4AddressObj2 [ixNet add $ipv4AddressObj "counter"]
    ixNet setMultiAttribute $ipv4AddressObj2 \
	-start $start \
	-step $step \
	-direction $direction
    ixNet commit
    
    return [lindex [ixNet remapIds $ipv4AddressObj2] 0]
}