Use more hole punching techniques

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• Universal Plug and Play (UPnP) Internet Gateway Device - Port Control Protocol Interworking Function (IGD-PCP IWF)
• NAT Port Mapping Protocol (NAT-PMP)
• Port Control Protocol (PCP)
• mDNS

See also:

• Use open ports pion/webrtc#1787
• https://en.wikipedia.org/wiki/Internet_Gateway_Device_Protocol

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First we would need to implement a SmartNAT node which extends Gont's existing NAT router.
This SmartNAT node would need to run a userspace daemon which implements the protocols listed above and setups NFTables rules accordingly.

[stv0g]

Existing implementations

Go

• https://github.com/sashahilton00/go-pcp
• https://github.com/fd/go-nat
  • https://github.com/libp2p/go-nat
• https://github.com/emersion/go-upnp-igd
• https://gitlab.com/NebulousLabs/go-upnp
• https://github.com/jackpal/go-nat-pmp
• https://github.com/ethereum/go-ethereum/tree/master/p2p/nat
• https://github.com/tailscale/tailscale/tree/main/net/portmapper

C

• http://miniupnp.free.fr/libnatpmp.html

Daemons

• http://miniupnp.free.fr/

See also: https://en.wikipedia.org/wiki/Port_Control_Protocol#Implementations

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I've started implementation in a new pion/portmap package.