NAT and NAT Traversal

NAT and NAT Traversal

NAT and NAT Traversal SEng490 Directed Study Haoran Song Supervised by Dr. Jianping Pan Outline Problems of NAT in the real world

NAT Traversal in our research Conclusion Firewalls and NAT Four Types of NAT Full Cone NAT 2.

IP Restricted NAT 3. Port Restricted NAT 4. Symmetric NAT Then let us see how these four NATs work? 1.

Full Cone: not very restricted B IP Restricted NAT

Has restrictions on incoming IP Port Restricted NAT Not only has restrictions on IP, but also on Port

Symmetric NAT Very restricted. New mapping for each different connection. Problems caused by NAT

So, When we do communication with NAT, outside packets can not come in until inside packets go out first. We need to find a way to

overcome this problem and this technique is called NAT Traversal. NAT Traversal 1. 2.

1. 2. Our plan We need to know what NAT we are

behind Do NAT traversal according to the identified NAT Therefore, two main parts in our research NAT Detection NAT Traversal

NAT Detection We get the PolyNAT from Dr. Hoffman. It can emulates four different NATs. Thanks to Dr. Hoffman and his students.

NAT Detection Flow Example: Full Cone Detection NAT Traversal

A NAT Traversal B cone IP restricted port restricted symmetric cone IP restricted port restricted

symmetric

?

? Full Cone-Full Cone Full Cone-Full Cone: Scenario Full cone/restrictedrestricted

Full cone/restricted-restricted Scenario Full cone/IP restrictedsymmetric Full cone/IP restricted-symmetric Scenario

How does clients describe who they are We build our own traversal commands

We use XML to describe necessary information and embed these descriptions in our traversal commands. So, other clients get specified information about their peers by learning these XML contents.

An example of a traversal command Conclusion 1. 2. 3.

1. 2. We have implemented Full Cone Full Cone Full/Restricted Cone Restricted Cone

Full/IP Restricted Cone Symmetric The things we will do in the future Port Restricted Cone Symmetric Symmetric Symmetric NAT and NAT Traversal

Questions?

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