NAT
Rewriting addresses and ports in flight so many private hosts share a public address, and everything that breaks as a result. Interviewers use it to test whether you understand end-to-end addressing.
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- SNAT and DNAT5 questions
- PAT and Port Mapping5 questions
- Port Forwarding5 questions
- Hairpinning4 questions
- NAT Traversal6 questions
- Security and Limitations6 questions
questions
page 2 of 2Designing a carrier-grade NAT, how would you choose between per-session port allocation, per-subscriber port blocks and fixed port ranges, and how would you size them?
level: principalimportance: nice to knowfreq 14%
basics
~20 sRFC 6888 asks a carrier-grade NAT's port scheme to maximize port use, minimize log volume and resist guessing; no scheme wins all three: per-session allocation uses ports best, fixed ranges log least, blocks sit between.
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