go-nats

NAT type discovery tool using STUN written purely in Go, powered by pion.

Usage

$ go build
$ ./go-nats -h
Usage of ./go-nats:
  -s string
        STUN server address. (default "stun.sipgate.net:3478")
  -v	Verbose

Example:

$ ./go-nats -s stun.sipgate.net
{
  "isNatted": true,
  "mappingBehavior": 0,
  "filteringBehavior": 2,
  "portPreservation": true,
  "natType": "Port-restricted cone NAT",
  "externalIP": "23.3.5.241"
}

Depending on the type of NAT, it may take ~8 seconds.

Public STUN servers

STUN servers to use must support RFC 5780 (NAT Behavior Discovery Using STUN). Here's a list of public STUN servers that worked with go-nats as of Sep. 13, 2019.

• stun.ekiga.net
• stun.callwithus.com
• stun.counterpath.net
• stun.sipgate.net
• stun.sipgate.net:10000
• stun.1-voip.com
• stun.12connect.com
• stun.1und1.de
• stun.3clogic.com

TODO: there may be more from this list: Emercoin/ENUMER projects