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NAT

NAT. Steve VanDeBogart. Outline. Common NAT – m:1 Rewriting based on Port Reserved Addresses Classic NAT - m:n Static/Dynamic Issues. N2.1. NAT Router. Internet. N2.1. N2.2. N1.1. N2. x. N2.3. N2.4. N2. m. N2.5. Common Nat – m:1. Problem?. Solution: Private Network.

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NAT

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  1. NAT Steve VanDeBogart

  2. Outline • Common NAT – m:1 • Rewriting based on Port • Reserved Addresses • Classic NAT - m:n • Static/Dynamic • Issues

  3. N2.1 NAT Router Internet N2.1 N2.2 N1.1 N2.x N2.3 N2.4 N2.m N2.5 Common Nat – m:1 Problem? Solution: Private Network

  4. Reserved Addresses • 1994: RFC 1597 • Non-Connected Use • 10.0.0.0 - 10.255.255.255 • 172.16.0.0 - 172.31.255.255 • 196.168.0.0 - 196.168.255.255 • Reserved on I-net?

  5. Nr.1 NAT Router Internet Nr.1 Nr.2 N1.1 . . . N1.n Nr.3 Nr.4 Nr.m Nr.5 Classic NAT – m:n Dynamic Assignment of Real IPs

  6. Static/Dynamic • Static • Assigned once – Randomly, or not • MN • Dynamic • Recycled: After last connection closes • Only N machines can have connections

  7. Issues • No Servers • Protocols with embedded IP’s • FTP • ICMP • DNS

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