Add: include interface pickup failure in log

crates/wtfnet-dnsleak/src/sensor.rs

@@ -309,8 +309,14 @@ fn select_interface(
     let ordered = order_interfaces(&interfaces);
     for iface in ordered.iter() {
         debug!("dns leak iface pick: try={}", iface.name);
-        if let Ok(channel) = open_channel_with_timeout(iface.clone(), config) {
-            return Ok(channel);
+        match open_channel_with_timeout(iface.clone(), config) {
+            Ok(channel) => return Ok(channel),
+            Err(err) => {
+                debug!(
+                    "dns leak iface pick: failed iface={} err={}",
+                    iface.name, err
+                );
+            }
         }
     }
 

docs/dns_leak_implementation_status.md

@@ -26,7 +26,7 @@ This document tracks the current DNS leak detector implementation against the de
 - Interface selection:
   - per-interface open timeout to avoid capture hangs
   - ordered scan prefers non-loopback + named ethernet/wlan and interfaces with IPs
-  - verbose logging of interface selection attempts (use `-v` / `-vv`)
+  - verbose logging of interface selection attempts + failures (use `-v` / `-vv`)
   - overall watch timeout accounts for worst-case interface scan time
 - Capture loop:
   - receiver runs in a worker thread; main loop polls with a short timeout to avoid blocking