Attempt to preserve the source port (best effort). This is the default.
Preserve source port. Use of the preserve-strict setting should be restricted to UDP only under very special circumstances such as nPath or transparent (that is, no translation of any other L3/L4 field), where there is a 1:1 relationship between virtual IP addresses and node addresses, or when clustered multi-processing (CMP) is disabled.
The change setting is useful for obfuscating internal network addresses.
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