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VPN TUNNELING PROTOCOLS. PPTP, L2TP, L2TP/IPsec. Ashkan Yousefpour Amirkabir University of Technology. Today’s Overview . Why using VPNs?. fast , secure and reliable connection between separated networks full access on resources from everywhere -> building a virtual local connection

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Vpn tunneling protocols

VPN TUNNELING PROTOCOLS

PPTP, L2TP, L2TP/IPsec

AshkanYousefpour

Amirkabir University of Technology



Why using vpns
Why using VPNs?

fast, secure and reliable connection betweenseparated networks

full access on resources from everywhere ->building a virtual local connection

reasonable access: building connection onlyto local ISP


PPTP - enables secure data transfers between a remote client and an enterprise server by creating a VPN across an IP-based internetwork


Point to point tunneling protocol pptp rfc 2637
Point-to-Point Tunneling Protocol (PPTP) [RFC 2637] and an enterprise server by creating a VPN across an IP-based internetwork

  • Standard method for transporting multiprotocol datagrams over point-to-point links

  • Mainly implemented and used by Microsoft

  • Extension of PPP

  • Allows tunneling of PPP datagrams over IP networks

  • Easy to use and to implement

  • Use of 2 connections

    • Control connection

    • Tunnel connection

  • Operates at layer 2 of OSI

  • Uses TCP Port 1723


Point to point tunneling protocol pptp rfc 2637 continued
Point-to-Point Tunneling Protocol (PPTP) [RFC 2637 and an enterprise server by creating a VPN across an IP-based internetwork] - continued

  • PPTP is a tunneling protocol provided by Microsoft, which provides remote users, encrypted, multi protocol access to a corporate network over the Internet.

  • It encapsulates PPP frames in IP data grams

  • Microsoft’s implementation of PPTP has been found to have several problems that make it vulnerable to attacks, and it also lakes the scalability in that it only supports 255 concurrent connections per server.

  • Require an IP Network between PPTP Client and PPTP Server ( either LAN or dial- up)

  • PPTP can support only one tunnel at a time for each user.


PPTP and an enterprise server by creating a VPN across an IP-based internetwork

  • Uses Generic Routing Encapsulation (GRE) to carry PPP packets

  • PPP payload can be encrypted and/or compressed

  • GRE header contains information about tunnel protocol and encryption algorithm

  • Structure of PPTP packet:


Layer 2 tunneling protocol l2tp rfc 2661
Layer 2 Tunneling Protocol (L2TP) [RFC 2661] and an enterprise server by creating a VPN across an IP-based internetwork

  • Uses UDP

  • Can be transported over IP, Frame Relay, ATM, X.25, ...

  • Allows multiple tunnels with multiple sessions inside every tunnel

  • UDP Port 1701

  • Commonly used with IPsec -> L2TP/IPsec


Layer 2 tunneling protocol l2tp rfc 2661 continued
Layer 2 Tunneling Protocol (L2TP) [RFC 2661] and an enterprise server by creating a VPN across an IP-based internetworkContinued

  • Structure of L2TP packet:


Layer 2 tunneling protocol l2tp rfc 2661 continued1
Layer 2 Tunneling Protocol (L2TP) [RFC 2661] and an enterprise server by creating a VPN across an IP-based internetworkContinued

  • A hybrid of Microsoft’s PPTP and Cisco Systems’ Layer 2 Forwarding - L2F protocol

  • can support multiple, simultaneous tunnels for each user.

  • It Uses UDP and supports any routed protocol, including IP, IPX and AppleTalk, including frame relay, ATM, X. 25

  • Because of L2TP’s use of PPTP, it is included as part of the remote access features of most Windows Products

  • It does not provide cryptographically key security features


Layer 2 tunneling protocol l2tp rfc 2661 continued2
Layer 2 Tunneling Protocol (L2TP) [RFC 2661] and an enterprise server by creating a VPN across an IP-based internetworkContinued

  • L2TP allows multiprotocol traffic to be encrypted and then sent over any medium that supports point-to-point datagram delivery, such as IP or asynchronous transfer mode (ATM).

  • L2TP is a combination of PPTP and Layer 2 Forwarding (L2F), a technology developed by Cisco Systems, Inc.

  • It can support IPsec for data encryption and integrity


L2tp ipsec
L2TP/IPsec and an enterprise server by creating a VPN across an IP-based internetwork

  • Uses IPsec Encapsulating Security Payload (ESP)

  • an IPsec Authentication trailer provides message integrity and authentication

  • Structure of encrypted packet:


L2tp ipsec vs pptp
L2TP/IPsec and an enterprise server by creating a VPN across an IP-based internetworkvs. PPTP


Thank you
Thank You! and an enterprise server by creating a VPN across an IP-based internetwork

Any Questions?


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