Let us pretend, for a moment, that your problem is not OpenBSD, and not IPSec. Something very simple, that happens to people all the time:
Problem: "I cannot drive my car."
With that much information, someone trying to help you can only guess at what the problem might be.
Guess #1: "Are you out of fuel?"
Guess #2: "Do you have a flat?"
Guess #3: "Does the starter motor turn?"
Guess #4: "Is the battery providing power?"
Guess #5: "Does the engine start?"
Guess #6: ....
Someone can keep guessing. Maybe they will guess correctly, or maybe they will never guess that you cannot find your keys.
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Now, let's move to your IPSec/OpenBSD problem. My first guess was "different IP address" and my second guess was "different PF configuration." You have told me my guesses are wrong.
Here's Guess #3: "Perhaps the isakmpd daemon is not being started."
How are you starting it? How do you know it is running? If the answer to both my questions is, "I don't know." then perhaps this is a good guess.
If you know it is starting successfully, and have confirmed that it starts, we can then move on to Guess #4.
