Enable `-natpmp` by default #33004

1. 
   darosior commented at 5:03 PM on July 17, 2025: member

   This turns the default for NAT hole-punching (with PCP or NAT-PMP) to on. Closes #31663.

2. mapport: turn -natpmp to on by default 3fc660d267
3. Add release notes for -natpmp enabled by default b2d07f872c
4. 
   DrahtBot commented at 5:03 PM on July 17, 2025: contributor

   <!--e57a25ab6845829454e8d69fc972939a-->

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   <!--006a51241073e994b41acfe9ec718e94-->

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33004.

   <!--021abf342d371248e50ceaed478a90ca-->

   Reviews

   See the guideline for information on the review process.

   Type	Reviewers
   ACK	ajtowns
   Concept ACK	achow101, sipa

   If your review is incorrectly listed, please react with 👎 to this comment and the bot will ignore it on the next update.

   <!--5faf32d7da4f0f540f40219e4f7537a3-->

5. fanquake added this to the milestone 30.0 on Jul 17, 2025
6. fanquake added the label P2P on Jul 17, 2025
7. 
   achow101 commented at 10:31 PM on July 22, 2025: member

   Concept ACK

8. 
   sipa commented at 10:50 PM on July 22, 2025: member

   utACK

9. 
   ajtowns commented at 2:03 AM on July 23, 2025: contributor

   ACK b2d07f872c58af9cfdf9f9a4af0645376f9b98cb

10. DrahtBot requested review from sipa on Jul 23, 2025
11. DrahtBot requested review from achow101 on Jul 23, 2025
12. fanquake merged this on Jul 23, 2025
13. fanquake closed this on Jul 23, 2025

    ---

14. 
    laanwj commented at 11:33 AM on July 24, 2025: member

    Post-merge ACK b2d07f872c58af9cfdf9f9a4af0645376f9b98cb

15. sedited referenced this in commit 02ded863ba on Jul 28, 2025
16. sedited referenced this in commit 52d7f32bd6 on Jul 28, 2025
17. luke-jr referenced this in commit 119af0d9bc on Jul 29, 2025
18. alexanderwiederin referenced this in commit 28fe919bf7 on Aug 6, 2025
19. sedited referenced this in commit b98d982d79 on Aug 7, 2025
20. alexanderwiederin referenced this in commit 4152176d02 on Aug 8, 2025
21. alexanderwiederin referenced this in commit 9ef94c31db on Aug 8, 2025
22. stringintech referenced this in commit 71275a1b5e on Aug 17, 2025
23. yuvicc referenced this in commit 22f55cf11d on Aug 26, 2025
24. bug-castercv502 referenced this in commit 4aa5572aea on Sep 28, 2025
25. stickies-v referenced this in commit a19c56cd7c on Nov 4, 2025
26. 
    0xB10C commented at 11:54 AM on April 29, 2026: contributor

    Some discussion on not seeing an effect of this (yet) on the network is here: https://bnoc.xyz/t/did-the-number-of-reachable-nodes-in-residential-isps-increase-since-bitcoin-core-v30-0/122

Review Requested
sipaachow101

Milestone
30.0