proc ConfigIpv4GatewayIpOverlayNgpf { ipv4GatewayIpObj count index indexStep valueStep value } {
    # Example: Each of the below uses the same Ipv4 Object.
    #
    #-step 0.0.0.0
    #-start 1.1.1.4
    #-direction increment
    #
    #-count 1 
    #-index 2 
    #-indexStep 0 
    #-valueStep 1.1.1.5 
    #-value 1.1.1.5
    #
    #-count 1
    #-index 3
    #-indexStep 0
    #-valueStep 1.1.1.6
    #-value 1.1.1.6
    
    puts "\nConfigIpv4GatewayIpOverlayNgpf: $ipv4GatewayIpObj : count=$count index=$index indexStep=$indexStep value=$value valueStep=$valueStep "
    set ipv4GatewayOverlayObj [ixNet add $ipv4GatewayIpObj "overlay"]
    ixNet setMultiAttribute $ipv4GatewayOverlayObj \
	-count $count \
	-index $index \
	-indexStep $indexStep \
	-valueStep $valueStep \
	-value $value
    ixNet commit

    return [lindex [ixNet remapIds $ipv4GatewayOverlayObj] 0]
}