From 76a481a759dc9632519fc0e0c4d359d69128e818 Mon Sep 17 00:00:00 2001
From: HardenedSteel <19209715+HardenedSteel@users.noreply.github.com>
Date: Sat, 13 Dec 2025 05:22:24 +0300
Subject: [PATCH] feat: change published port if full-cone

If we're behind full-cone NAT; update our published port number while
keeping our listening port number, so other peers can connect us even
we're behind NAT.
---
 libi2pd/SSU2Session.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libi2pd/SSU2Session.cpp b/libi2pd/SSU2Session.cpp
index 9244681a..c8086270 100644
--- a/libi2pd/SSU2Session.cpp
+++ b/libi2pd/SSU2Session.cpp
@@ -1838,14 +1838,20 @@ namespace transport
 						if (i2p::context.GetTesting ())
 							i2p::context.SetError (eRouterErrorSymmetricNAT);
 						else if (m_State == eSSU2SessionStatePeerTest)
+						{
 							i2p::context.SetError (eRouterErrorFullConeNAT);
+							i2p::context.UpdatePort((int)ep.port ());
+						}
 					}
 					else
 					{
 						if (i2p::context.GetTestingV6 ())
 							i2p::context.SetErrorV6 (eRouterErrorSymmetricNAT);
 						else if (m_State == eSSU2SessionStatePeerTest)
+						{
 							i2p::context.SetErrorV6 (eRouterErrorFullConeNAT);
+							i2p::context.UpdatePort((int)ep.port ());
+						}
 					}
 				}
 				else