Network Protocols IP addendum or peculiarities and items of interest TDC375 Autumn 2010 11 John Kristoff DePaul University 1 What could have been different Addressing larger variable length automatic derivation central coordination rent versus own Elimination of certain fields Call the TTL a hop count Getting rid of the version field Fragmentation strategies TDC375 Autumn 2010 11 John Kristoff DePaul University 2 Hop count TTL Is it better to count up or down Does it matter where you start How do you use it as a security knob kind of think anti spoofing and hop limiting TDC375 Autumn 2010 11 John Kristoff DePaul University 3 Routing Multihoming Minimize route table size Performing fast look ups Authenticate routes paths or prefixes Churn Policy routing Measurement and monitoring TDC375 Autumn 2010 11 John Kristoff DePaul University 4 Privacy How do or don t you have it IPX was better in some ways but less privacy IPv6 can construe hardware based node address How do you get source address anonymity How do you prevent source address anonymity TDC375 Autumn 2010 11 John Kristoff DePaul University 5 Service differentiation Kind of a holy grail of packet networking CoS or QoS Will differentiation hold beyond an AS Within an AS you can often over provision especially with LAN links then no need for differentiation Recurring cost and complexity trade offs TDC375 Autumn 2010 11 John Kristoff DePaul University 6 IP multicast When you see a bunch of engineers standing around congratulating themselves for solving some particularly ugly problem in networking go up to them whisper multicast jump back and watch the fun begin purportedly David Clark IETF plenary 1991 Group discovery Group security Sending packets to a group Can you do all this simply without network state TDC375 Autumn 2010 11 John Kristoff DePaul University 7 Some things to be familiar with Default free Ships in night Traffic engineering Whois NetFlow traceroute TDC375 Autumn 2010 11 John Kristoff DePaul University 8
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