Otherwise your browser couldn’t load any web pages. But obviously it has to let some traffic in. Typically the router is blocking all incoming traffic. When packets come back in from the outside, it rewrites the destination packet IP address, putting the private IP back in. When the packets pass through the router going out, it rewrites the source address in the packets, replacing the private address with the public IP address. The way NAT works is that the router gives out special “private” IP addresses to your computers on one side of the router, while hanging on to a single public IP address on the “public” facing side of the router. The downside of NAT is that it makes it a bit trickier to connect your computer to your friend’s computer so you can play games. NAT is great – it allows multiple devices in your home to share a single public IP address and protects those devices from network attacks from other computers. Your computer communicates with the rest of the Internet using what is called NAT: Network Address Translation. Instead, it is getting its IP address from the router.
However, once you have a router sitting between your computer and the internet, your computer no longer has a public IP address. If your computer is connected directly to the Internet, then you don’t need to worry about stuff like NAT punch-through. All of the advice in this post pertains to UDP only. I should also point out that Contraption Maker is using UDP, and that although NAT punch-through can be done using TCP, I have no experience getting that to work. Nothing in this post is groundbreaking, but the NAT punch-through trick is a bit, well, tricky – and I think another attempt to explain it might benefit someone out there trying to implement it for their game.
#Contraption maker halliween how to
I found some great resources online that describe how to do this, which are listed at the end of the article. We wanted it to be a simpler experience, where one person just creates the server with a name like “Keith’s Server” and then another person can find that server in a list on their copy of the game and join. This usually requires modifying your router configuration to allow port forwarding, or to set up a server on a public IP address. Some indie games that have multiplayer support simply ask you to enter the IP address of the server to connect to. In Spotkin’s Game, Contraption Maker, we wanted to add multiplayer support so that people could build cool contraptions together online.
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