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NAT444 Operational Concerns

Learn why NAT444 raises operational concerns and discover the risks associated with conflicting address space, customer churn, and troubleshooting issues. Explore alternatives and mitigating factors to consider when deploying NAT444 in your network.

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NAT444 Operational Concerns

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  1. NAT444 Operational Concerns • The Bad and the Ugly

  2. Why NAT444? • Either operators are masochistic or “the alternative is worse” (or both) • Changing CPE can lead to $$ or customer churn • v4 only end devices (CE for example)

  3. What is worse than NAT444? • NAT444 with conflicting address space on both sides of the CPE • While some parts of 1918 space are “default” use for NAT devices, the whole space is at risk for conflict • Front-line call centres’ will find trouble-shooting this “challenging.”

  4. What are the alternatives? • Avoid NAT444 - trust us, we’d REALLY like to, without breaking our business • Deploy NAT444 using 1918 space and roll the dice • Deploy NAT444 with re-useable address space that is not a space recommended by vendors and other documentation as being available to use (and used by default, etc.)

  5. Mitigating Factors • Size of space is “flexible” so long as it is reasonable. • For some a /8 is too small (so there would be parallel NAT444 clouds) • For all a /16 is probably too small • Somewhere in-between is correct • The space is “re-useable” but reserved for NAT-based service providers. When (not if) customers use it, they will have to do so manually, and that is easier to deal with • The space has a time horizon that is based around CPE fleet turnover.

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