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We use static NAT for servers in a LAN. But using dynamic NAT doesn't have any effect, then why is it a standard? Is it because of the overhead faced by the server, to map each connection/request to it's local ip and vice-versa. Please help.

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    Why do you want to use dynamic NAT? I don't see what your issue is. More information would also help. – HAL Jun 12 '14 at 15:10
  • It's just a doubt. Is it feasible to use dynamic NAT for a server in a LAN? (It was my first post, sorry for any mistakes.) – Josh Jun 12 '14 at 15:17
  • Could you clarify your question? Specifically, what do you mean by the statement "using dynamic NAT doesn't have any effect" and to which standard are you referring? – YLearn Jun 12 '14 at 17:32
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I think you're confused about the usual uses of static- and dynamic NAT.

Static is used on the outside router/firewall to expose a server/service located inward which wouldn't normally be reachable from the outside. (static: nailed in place, permanently mapped inward.)

Dynamic is used to enable inward transportation of return traffic for outgoing connections; so a web browser on a system with a private IP is dynamically mapped to a public address as the packets egress, and then the return traffic is mapped back for ingress. (dynamic: the inside end points change so the mappings are changing too.)

  • For those companies with few public addresses, generally private IP's are dynamic NAT or PAT. PAT (Port Address Translation) assigns each public PC a port then translates their traffic back to the private IP during ingress traffic. – HAL Jun 12 '14 at 15:39

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