CORNELL CS 514 - Lecture 21 VPNs and other network-level security concepts (25 pages)

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Lecture 21 VPNs and other network-level security concepts



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Lecture 21 VPNs and other network-level security concepts

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Pages:
25
School:
Cornell University
Course:
Cs 514 - Intermediate Computer Systems
Intermediate Computer Systems Documents

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CS514 Intermediate Course in Computer Systems Lecture 21 Nov 5 2003 VPNs and other network level security concepts VPN Taxonomy CS514 VPN Network End to end Provider based Provider based Compulsory Customer based Customer based Voluntary Secure Non secure L3 L2 ATM Frame Relay LAN Virtual Router BGP MPLS Secure Non secure 1 What is a VPN CS514 Making a shared network look like a private network Why do this z Private networks have all kinds of advantages we ll get to that z But building a private network is expensive cheaper to have shared resources rather than dedicated History of VPNs CS514 Originally a telephone network concept z Separated offices could have a phone system that looked like one internal phone system Benefits z z Fewer digits to dial Could have different tariffs Company didn t have to pay for individual long distance calls z Came with own blocking probabilities etc Service guarantees better or worse than public phone service 2 Original data VPNs CS514 Lots of different network technologies in those days z z z Providers offer virtual circuits between customer sites z z Decnet Appletalk SNA XNS IPX None of these were meant to scale to global proportions Virtually always used in corporate settings Frame Relay or ATM A lot cheaper than dedicated leased lines Customer runs whatever network technology over these These still exist but being replaced by IP VPNs VPN Taxonomy CS514 VPN Network End to end Provider based Provider based Compulsory Customer based Customer based Voluntary Secure Non secure L3 L2 ATM Frame Relay LAN Virtual Router BGP MPLS Secure Non secure 3 Advantages of original data VPNs CS514 Repeat a lot cheaper than dedicated leased lines z z Fine grained bandwidth tariffs Bandwidth guarantees z Corporate users had no other choice This was the whole business behind framerelay and ATM services Service Level Agreements SLA Multi protocol Frame Relay VPN Example CS514 CE CE CE FR CE FR FR FR CE FR FR FR CE CE CE CE Customer Equipment FR Frame



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