From 2d6e2cfdfdf4397104ec501aa147063cfb6fcee0 Mon Sep 17 00:00:00 2001
From: Johannes Truschnigg <johannes@truschnigg.info>
Date: Thu, 17 Mar 2022 19:59:41 +0100
Subject: [PATCH] Check for configured interfaces

---
 lagdetect.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lagdetect.sh b/lagdetect.sh
index b07bbb2..bca7ffa 100755
--- a/lagdetect.sh
+++ b/lagdetect.sh
@@ -156,6 +156,16 @@ do
 done
 
 
+for i in "${IFACE_RX}" "${IFACE_TX}"
+do
+  if ip link show "${i}" >/dev/null
+  then
+    printf 'FATAL: Interface "%s" seems bogus\n' "${i}"
+    exit 1
+  fi
+done
+
+
 set -u
 
 
-- 
2.39.5