NAT Traversal testing

[whyrusleeping]

We really need to start actually testing NAT traversal in a variety of different scenarios. I have investigated a few different ways of doing this virtually, and theyre all 'really hard'. My current solution for the near term is to build a physical network with a way to automate the different NAT traversal scenarios of each router in the network for testing.

Whatever method is chosen, we can use this issue to track the implementation.

[ghost]

We should also get samples of known-weird routers

[whyrusleeping]

@lgierth oooooh, yes. Good point.

[ghost]

(I'd offer to have an online-accessible physical testbed at my place, have plenty of room)

[daviddias]

@lgierth I'll be back to Berlin for the 28th of August, I can stay some extra days and we could hack this together. How does that sound? :)

[stv0g]

I am currently also testing the NAT traversal capabilities of my own app.

I've written my own Golang-based version of mininet, the Go network testing toolkit (Gont).

However, I am now struggling to replicate the various NAT-styles. It seems like the standard masquerading feature of Netfilter is a symmetric NAT which is not really useful for our use-case.

I am now working on implementing other NAT-types in Gont.

[mxinden]

@stv0g thanks for commenting here. I think it is also worth following testground/testground#1299. Let us know in case you want to collaborate on any of these efforts.

[marten-seemann]

Tracked by libp2p/test-plans#126.