3 ms·

If the router reboots, it cannot remember the correct mapping of the last connection, right? (The mapped port may not be the original source port)

• patrakov 2y ago
  (edited) Correct, this pickup of ports from the ACKs that the internal host keeps resending only works if the externally mapped port didn't change from the default (same as internal).
• r1ch 2y ago
  That's why port preservation is the usual behavior.