diff --git a/neutron/templates/bin/_neutron-linuxbridge-agent-init.sh.tpl b/neutron/templates/bin/_neutron-linuxbridge-agent-init.sh.tpl
index 33e7b4a518..4816c90f01 100644
--- a/neutron/templates/bin/_neutron-linuxbridge-agent-init.sh.tpl
+++ b/neutron/templates/bin/_neutron-linuxbridge-agent-init.sh.tpl
@@ -54,7 +54,7 @@ tunnel_interface="{{- .Values.network.interface.tunnel -}}"
 if [ -z "${tunnel_interface}" ] ; then
     # search for interface with default routing
     # If there is not default gateway, exit
-    tunnel_interface=$(ip route list 0/0 | grep -oP '(?<=dev\s)\w+') || exit 1
+    tunnel_interface=$(ip -4 route list 0/0 | awk -F 'dev' '{ print $2; exit }' | awk '{ print $1 }') || exit 1
 fi
 
 # determine local-ip dynamically based on interface provided but only if tunnel_types is not null
diff --git a/neutron/templates/bin/_neutron-openvswitch-agent-init.sh.tpl b/neutron/templates/bin/_neutron-openvswitch-agent-init.sh.tpl
index 609dd23ac4..e084043a93 100644
--- a/neutron/templates/bin/_neutron-openvswitch-agent-init.sh.tpl
+++ b/neutron/templates/bin/_neutron-openvswitch-agent-init.sh.tpl
@@ -32,7 +32,8 @@ timeout 3m neutron-sanity-check --config-file /etc/neutron/neutron.conf --config
 tunnel_interface="{{- .Values.network.interface.tunnel -}}"
 if [ -z "${tunnel_interface}" ] ; then
     # search for interface with default routing
-    tunnel_interface=$(ip route list 0/0 | grep -oP '(?<=dev\s)\w+')
+    # If there is not default gateway, exit
+    tunnel_interface=$(ip -4 route list 0/0 | awk -F 'dev' '{ print $2; exit }' | awk '{ print $1 }') || exit 1
 fi
 
 # determine local-ip dynamically based on interface provided but only if tunnel_types is not null