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2024-04-09T5169: Add PoC for generating CGNAT rules rfc6888Viacheslav Hletenko
Add PoC for generating CGNAT rules https://datatracker.ietf.org/doc/html/rfc6888 Not all requirements are implemented, but some of them. Implemented: REQ-2 ``` A CGN MUST have a default "IP address pooling" behavior of "Paired" CGN must use the same external IP address mapping for all sessions associated with the same internal IP address, be they TCP, UDP, ICMP, something else, or a mix of different protocols. ``` REQ-3 ``` The CGN function SHOULD NOT have any limitations on the size or the contiguity of the external address pool ``` REQ-4 ``` A CGN MUST support limiting the number of external ports (or, equivalently, "identifiers" for ICMP) that are assigned per subscriber ``` CLI: ``` set nat cgnat pool external ext1 external-port-range '1024-65535' set nat cgnat pool external ext1 per-user-limit port '1000' set nat cgnat pool external ext1 range 192.0.2.222/32 set nat cgnat pool internal int1 range '100.64.0.0/28' set nat cgnat rule 10 source pool 'int1' set nat cgnat rule 10 translation pool 'ext1' ```