}

	// Append port to address.
	if ip.To4() != nil {
		return fmt.Sprintf("%s:%d", addr, port)
	}
	return fmt.Sprintf("[%s]:%d", addr, port)
}

// EnsureSysctl sets a kernel sysctl to a given numeric value.
func EnsureSysctl(sysctl utilsysctl.Interface, name string, newVal int) error {
	if oldVal, _ := sysctl.GetSysctl(name); oldVal != newVal {
		if err := sysctl.SetSysctl(name, newVal); err != nil {

		if err := proxyutil.EnsureSysctl(sysctl, sysctlConnReuse, 0); err != nil {
			return nil, err
		}
	}

	// Set the expire_nodest_conn sysctl we need for
	if err := proxyutil.EnsureSysctl(sysctl, sysctlExpireNoDestConn, 1); err != nil {
		return nil, err
	}

	// Set the expire_quiescent_template sysctl we need for
	if err := proxyutil.EnsureSysctl(sysctl, sysctlExpireQuiescentTemplate, 1); err != nil {

		if err := proxyutil.EnsureSysctl(sysctl, sysctlRouteLocalnet, 1); err != nil {
			return nil, err
		}
	}

	// Be conservative in what you do, be liberal in what you accept from others.