diff --git a/infrastructure-guide/troubleshooting.md b/infrastructure-guide/troubleshooting.md
index c9dfa05e..9ec15439 100644
--- a/infrastructure-guide/troubleshooting.md
+++ b/infrastructure-guide/troubleshooting.md
@@ -5,3 +5,11 @@ To be able to debug early network issues in the boot process the 2 test VMs lxde
 
 I.e. lxdev04 has a second interface that mirrors the primary interface of lxdev05 and lxdev05 has a second interface that mirrors the primary interface of lxdev04.
 
+Bring the device up without IP address:
+
+```
+ip link set dev ens192 up
+ip addr flush dev ens192
+```
+and then use `tcpdump -i ens192 ...`
+