N/w Tunneling Presentation

Network Tunneling – The Concept, the Applications Atishay Jain, 10783017 BE 3rd Year, Thapar University.

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Contents 1

Introduction – The What?

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A little basics – The How?

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Applications – The Positives !

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Misuse – The Negatives !

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Conclusion – That Does it ! Atishay Jain,Network Tunneling

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Introduction – What it is? v Some terms, you might be interested in – Proxy(URL Translation), Tunnel(Ultrasurf), Work at Home, Virtual Private Networks, etc…

“A tunnel provides a route for moving from one of its ends to another, hiding details of the route in between”

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Intro – contd… vFormal Definition: “The term tunneling protocol is used to describe when one network protocol called the payload protocol is encapsulated within a different delivery protocol” Atishay Jain,Network Tunneling

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The Basics – the How? L2 for delivery

Layer 2 Tunneled in L3

Layer 3 Goes to L3

Layer 3 A normal packet

Layer 4

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Types Popular Types

HTTP Encapsulation

SSH Encapsulation This tunneling involves encapsulation into the SSH protocol – for obvious reasons security.

Others: L2 Encapsulation, IPv6 to IPv4, Proprietary Protocols, etc…

Plugging within a HTTP packet can be for various reasons – HTTP is most used, normally accessible - I hope you get an idea malicious as well as non-malicious …

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SSH Port Forwarding

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HTTP & HTTPS

vHTTP inside HTTP, the most popular…

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Terms v Proxy and URL Translation. v SOCK 4/5. v Tunnel Broker – RFC 3053 v Tunneling Software

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Applications – the Positives ! Work at Home Secure Transfer

IPv6 in IPv4 Prepare an IPv6 packet. •Encrypt it in IPv4 packet with the address of a translation server. •Cross the old IPv4 routers •Decapsulate. •

Encapsulate information in primitive protocol •Encapsulate in a secure protocol •Send •Decapsulate •

Tunneling

VPN

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VPN & Work at Home Concept

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Misuse – The Negatives ! vAccessing Blocked Material …..

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Conclusion – That Does it ! vGood and Bad is of each technology… vTunneling has changed the way we live… vPreventing misuse is next to impossible, but I think we would never want internet to get lost over these issues.

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Thank You ! Atishay Jain 10783017

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