From ba0a8f1b7ccd021e373f687c8af38ef2612a9359 Mon Sep 17 00:00:00 2001
From: Siavash Sameni <manwe@MacBook-Air.local>
Date: Tue, 31 Mar 2026 18:41:57 +0400
Subject: [PATCH] Add UDP TX error logging for IPv6 debugging

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 src/server.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/server.rs b/src/server.rs
index 8a4e16a..a97f840 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -733,8 +733,11 @@ async fn udp_tx_loop(
                 state.tx_bytes.fetch_add(n as u64, Ordering::Relaxed);
                 consecutive_errors = 0;
             }
-            Err(_) => {
+            Err(e) => {
                 consecutive_errors += 1;
+                if consecutive_errors == 1 {
+                    tracing::warn!("UDP TX send error: {} (target={})", e, target);
+                }
                 if consecutive_errors > 1000 {
                     tracing::warn!("UDP TX: too many consecutive send errors, stopping");
                     break;