diff --git a/roles/overcloud-prep-images/defaults/main.yml b/roles/overcloud-prep-images/defaults/main.yml
index c413e55a9..a2203fc7d 100644
--- a/roles/overcloud-prep-images/defaults/main.yml
+++ b/roles/overcloud-prep-images/defaults/main.yml
@@ -9,6 +9,11 @@ step_register: true
 step_introspect: false
 step_introspect_debug: false
 step_introspect_debug_tcpdump_log: "{{ working_dir }}/overcloud_prep_images_introspection_debug.pcap.log"
+step_introspect_debug_tcpdump_ports:
+  - 67
+  - 68
+  - 69
+  - 623
 step_introspect_with_retry: false
 bash_deploy_ramdisk: false
 step_install_undercloud: true
diff --git a/roles/overcloud-prep-images/templates/overcloud-prep-images.sh.j2 b/roles/overcloud-prep-images/templates/overcloud-prep-images.sh.j2
index bf305d09c..d715ba48c 100644
--- a/roles/overcloud-prep-images/templates/overcloud-prep-images.sh.j2
+++ b/roles/overcloud-prep-images/templates/overcloud-prep-images.sh.j2
@@ -137,7 +137,7 @@ done
 {% if step_introspect_debug|bool %}
 
 sudo yum -y install tcpdump
-sudo tcpdump -i any port 67 or port 68 or port 69 -w {{ step_introspect_debug_tcpdump_log }} &
+sudo tcpdump -i any port {{ step_introspect_debug_tcpdump_ports | join(' or port ') }} -w {{ step_introspect_debug_tcpdump_log }} &
 sleep 1
 pidof_tcpdump=$(ps --ppid $! -o pid=)