routing Protocols and Virtual private network


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routing Protocols and Virtual private network

  1. 1. By SHUBHAM SHARMA FINAL YEAR(CS) [email_address]
  2. 2. DIFFERENT ROUTING PROTOCOLS <ul><li>RIP & RIP V2 (Routing Information Protocol ) </li></ul><ul><li>IGRP (Interior Gateway Routing Protocol ) </li></ul><ul><li>EIGRP (Enhanced IGRP ) </li></ul><ul><li>OSPF ( Open Shortest Path First ) </li></ul><ul><li>IS-IS ( Intermediate System to Intermediate System ) </li></ul><ul><li>BGP ( Border Gateway Protocol ) </li></ul>
  3. 3. Open Shortest Path First <ul><li>KEY FEATURES </li></ul><ul><li>Link state routing loop free protocol </li></ul><ul><li>Classless routing protocol </li></ul><ul><li>Default AD value 110 </li></ul><ul><li>Uses dijkastra algorithm </li></ul><ul><li>Ospf packet types </li></ul><ul><li>Hello packet </li></ul><ul><li>Database descriptor </li></ul><ul><li>Link state request </li></ul><ul><li>Link state update </li></ul><ul><li>Acknowledgement </li></ul>
  4. 4. Ospf Tables <ul><li>Neighbour tables </li></ul><ul><li>Database tables </li></ul><ul><li>Routing tables </li></ul><ul><li>Ospf network types </li></ul><ul><li>Point to point </li></ul><ul><li>Broadcast network </li></ul><ul><li>NBMA </li></ul>
  5. 5. INTERMEDIATE SYSTEM TO INTERMEDIATE SYSTEM <ul><li>Link state routing Protocol </li></ul><ul><li>Is-Is build a topological representation of network </li></ul><ul><li>Supports the larger network </li></ul><ul><li>Inter area router </li></ul><ul><li>Intra area router </li></ul><ul><li>It do not use the backbone area </li></ul><ul><li>[ edit ] Comparison with </li></ul>
  6. 6. Border gateway protocol <ul><li>BGP is a multi-vendor “open” protocol with multiple implementations. It is the only actively used EGP on the Internet. </li></ul><ul><li>The main design feature of BGP was to allow ISPs to richly express their routing policy, both in selecting outbound paths and in announcing internal routes. </li></ul>
  7. 7. <ul><li>An Exterior Gateway Protocol (EGP), used to hundreds of thousands of routes between networks (ASs). </li></ul><ul><li>BGP AND ASNs </li></ul>AS 4969 AS 5000 AS 6461 AS 701
  8. 8. iBGP vs. eBGP <ul><li>BGP is very strange. It is promiscuous with external routes, making it very easy , yet it makes it very hard to advertise routes thoroughly inside your network. </li></ul><ul><li>iBGP sessions are established when peering with the same AS; eBGP otherwise. </li></ul><ul><li>Same protocols; different route install rules. </li></ul><ul><li>YOU MUST STRONGLY FILTER ALL eBGP SESSIONS! </li></ul>
  9. 9. What is a VPN
  10. 10. Private Networks vs. Virtual Private Networks <ul><li>Employees can access the network (Intranet) from remote locations. </li></ul><ul><li>Secured networks. </li></ul><ul><li>The Internet is used as the backbone for VPNs </li></ul><ul><li>Saves cost tremendously from reduction of equipment and maintenance costs. </li></ul>
  11. 11. Three Protocols used in VPN <ul><li>PPTP -- Point-to-Point Tunneling Protocol </li></ul><ul><li>L2TP -- Layer 2 Tunneling Protocol </li></ul><ul><li>IPsec -- Internet Protocol Security </li></ul>
  12. 13. VPN Encapsulation of Packets
  13. 14. Advantages: Cost Savings <ul><li>Eliminating the need for expensive long-distance leased lines </li></ul><ul><li>Reducing the long-distance telephone charges for remote access. </li></ul><ul><li>Transferring the support burden to the service providers </li></ul><ul><li>Operational costs </li></ul>
  14. 15. Disadvantages <ul><li>VPNs require an in-depth understanding of public network security issues and proper deployment of precautions </li></ul><ul><li>Availability and performance depends on factors largely outside of their control </li></ul><ul><li>VPNs need to accommodate protocols other than IP and existing internal network technology </li></ul>
  15. 16. <ul><li>Questions? </li></ul>