songjiayang / natat

It's a NAT sniffing tool that you can use to determine your NAT type.

natat

natat is an abbreviation for nat assert. It's a NAT sniffing tool that you can use to determine your NAT type.

Installation

Go get with:

go get github.com/songjiayang/natat

Usage

• Testing with Symmetric NAT

$ natat
2019/04/12 16:39:33 start stun server ping...
2019/04/12 16:39:34 stun.l.google.com:19302 mapped: 0.0.0.0:3489 -> 103.90.76.164:35598
2019/04/12 16:39:34 stun1.l.google.com:19302 mapped: 0.0.0.0:3489 -> 45.64.52.117:6078
2019/04/12 16:39:34 start NAT type assert...
2019/04/12 16:39:34 It's Symmetric NAT

• Testing with Cone NAT

$ natat
2019/04/12 20:42:47 start stun server ping...
2019/04/12 20:42:48 stun.l.google.com:19302 mapped: 0.0.0.0:3489 -> 101.84.52.37:26262
2019/04/12 20:42:48 stun1.l.google.com:19302 mapped: 0.0.0.0:3489 -> 101.84.52.37:26262
2019/04/12 20:42:48 start NAT type assert...
2019/04/12 20:42:48 It's Cone NAT

• More configuration:

$ natat -h
Usage of natat:
  -bind string
    	ping with local address bind. (default "0.0.0.0:3489")
  -studs string
    	stun servers for ping. (default "stun.l.google.com:19302,stun1.l.google.com:19302")

Supported NAT Type

• Full Cone
• Restricted Cone
• Port Restricted Cone
• Symmetric

Thanks

• RFC 3489

• stun servers:

  • stun.l.google.com:19302
  • stun1.l.google.com:19302
  • stun2.l.google.com:19302
  • stun3.l.google.com:19302
  • stun4.l.google.com:19302
  • more