CSE 123 Lecture Notes - Lecture 11: Address Space, Ipv6 Address, Network Address Translation
22 Oct 2018
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Class c too small for most orgs! Does not create any more addresses! (still 32-bit addresses) No longer constrained to class a-c addresses! Networks described by variable-length prefix & length. Allows arbitrary allocation between network and host address. 10. 0. 0. 0 is network and remainder (95. 1. 2) is host. If they"re the same length, same pattern, then they can"t be different! (no ties) Only use the longest name in your forwarding table. Start from the msbs, all the way to the prefix. 0001 001 | 0 longest matching prefix! (23 bits) Route aggregation - if they get a bunch of networks in the same direction, and all contiguous in the sorted list of names, can be sorted in a more efficient way. Send me anything w/ addresses beginning 200. 23. 16. 0/20. Send me anything with address beginning 199. 31. 0. 0/16 or 200. 23. 18. 0/23 (special and more specific) Move in large blocks, not small ones! Now where should that router go? points to the service you"re buying from!
