def DeviceGroupProtocolStackNgpfPy(deviceGroup, ipType):
    # This Proc is an internal API for VerifyArpNgpf.
    # It's created because each deviceGroup has IPv4/IPv6 and
    # a deviceGroup could have inner deviceGroup that has IPv4/IPv6.
    # Therefore, you can loop device groups.

    import re
    unresolvedArpList = []
    for ethernet in ixNet.getList(deviceGroup, 'ethernet'):
        for ipProtocol in ixNet.getList(ethernet, ipType):
            resolvedGatewayMac = ixNet.getAttribute(ipProtocol, '-resolvedGatewayMac')
            for index in range(0, len(resolvedGatewayMac)):
                if (bool(re.match('.*Unresolved.*', resolvedGatewayMac[index]))):
                    multivalueNumber = ixNet.getAttribute(ipProtocol, '-address')
                    srcIpAddrNotResolved = ixNet.getAttribute(ixNet.getRoot()+multivalueNumber, '-values')[index]
                    print '\tFailed to resolveARP:',  srcIpAddrNotResolved
                    unresolvedArpList.append(srcIpAddrNotResolved)

    if unresolvedArpList == []:
        print '\tARP is resolved'
        return 0
    else:
        return unresolvedArpList