Sure, you can add another layer of hacks like UPnP or NAT-PMP to work around the breakage a bit. Or try to use side effects like NAT boxes waiting UDP responses

Sure, you can add another layer of hacks like UPnP or NAT-PMP to work around the breakage a bit. Or try to use side effects like NAT boxes waiting UDP responses when they forward such a packet. And you can spend the rest of day telling yourself this is totally fine, because it works most of the times. Or could step back and see that this a terminally ill protocol on life support.