Hurricane Electric Internet Services Cogent Comm. ) Local Connection Backbone Connections 1 Router 4įorwarding table is configured by both intra- and inter-AS routing algorithm Intra-AS sets entries for internal dests Inter-AS & Intra-As sets entries for external dests 3a 3b 2a AS3 AS2 1a 2c AS1 2b 3c 1b 1d 1c Inter-AS Routing algorithm Intra-AS Routing algorithm Forwarding table Interconnected ASes OSPF BGP BGP for “which Internet gateway” (1b or 1c) Network Layer B IP A to D C A 1 2 3 E’net 6 E 4 5 D 7 Token Ring Station ( on a LAN) A Local Connection 1 Router Trunk or Long-Haul 3ī C A 1 2 3 6 E 4 5 D 7 Optimal Paths From Router 1 OSPF Defines Router 1's Sink Tree A Host (e.g., PC, Webcam. These may be Static (manually set up) or Dynamic (set up according to an Algorithm in the Router). The Internet is a Router Network In an Router Network, circuits are defined by entries in the Routing Tables along the way. Link (LAN) Link (LAN) Link (LAN) Link (LAN) Each LAN Connects to Internet via a Router Link (P-P) Link (P-P) 2 6 of “Network Security Essentials, Applications and Standards” by William Stallings) 2/15/16 Copeland 404 894-5177 Office: Klaus 3362 email or call for office visit Chapter 6 - IPsec (IP Secure) (note: includes copies of figures from Chap.
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