diff --git a/tcp_tests/templates/underlay/mk22-lab-advanced--user-data-cfg01.yaml b/tcp_tests/templates/underlay/mk22-lab-advanced--user-data-cfg01.yaml
index 31f60a7..c90e6ad 100644
--- a/tcp_tests/templates/underlay/mk22-lab-advanced--user-data-cfg01.yaml
+++ b/tcp_tests/templates/underlay/mk22-lab-advanced--user-data-cfg01.yaml
@@ -48,7 +48,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto ens3
           iface ens3 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1404.yaml b/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1404.yaml
index 669627d..b337f0c 100644
--- a/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1404.yaml
+++ b/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1404.yaml
@@ -90,7 +90,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto eth0
           iface eth0 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1604.yaml b/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1604.yaml
index 4951802..bf1ea31 100644
--- a/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1604.yaml
+++ b/tcp_tests/templates/underlay/mk22-lab-advanced--user-data1604.yaml
@@ -83,7 +83,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto ens3
           iface ens3 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-lab-basic--user-data-cfg01.yaml b/tcp_tests/templates/underlay/mk22-lab-basic--user-data-cfg01.yaml
index 31f60a7..c90e6ad 100644
--- a/tcp_tests/templates/underlay/mk22-lab-basic--user-data-cfg01.yaml
+++ b/tcp_tests/templates/underlay/mk22-lab-basic--user-data-cfg01.yaml
@@ -48,7 +48,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto ens3
           iface ens3 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-lab-basic--user-data1404.yaml b/tcp_tests/templates/underlay/mk22-lab-basic--user-data1404.yaml
index 8df02af..faadbb5 100644
--- a/tcp_tests/templates/underlay/mk22-lab-basic--user-data1404.yaml
+++ b/tcp_tests/templates/underlay/mk22-lab-basic--user-data1404.yaml
@@ -90,7 +90,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto eth0
           iface eth0 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-lab-basic--user-data1604.yaml b/tcp_tests/templates/underlay/mk22-lab-basic--user-data1604.yaml
index 4ec3a67..ff6539a 100644
--- a/tcp_tests/templates/underlay/mk22-lab-basic--user-data1604.yaml
+++ b/tcp_tests/templates/underlay/mk22-lab-basic--user-data1604.yaml
@@ -86,7 +86,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto ens3
           iface ens3 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-qa-lab01--user-data-cfg01.yaml b/tcp_tests/templates/underlay/mk22-qa-lab01--user-data-cfg01.yaml
index 31f60a7..c90e6ad 100644
--- a/tcp_tests/templates/underlay/mk22-qa-lab01--user-data-cfg01.yaml
+++ b/tcp_tests/templates/underlay/mk22-qa-lab01--user-data-cfg01.yaml
@@ -48,7 +48,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto ens3
           iface ens3 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1404.yaml b/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1404.yaml
index 8df02af..faadbb5 100644
--- a/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1404.yaml
+++ b/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1404.yaml
@@ -90,7 +90,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto eth0
           iface eth0 inet dhcp
diff --git a/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1604.yaml b/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1604.yaml
index 4ec3a67..ff6539a 100644
--- a/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1604.yaml
+++ b/tcp_tests/templates/underlay/mk22-qa-lab01--user-data1604.yaml
@@ -86,7 +86,7 @@
    ########################################################
 
   write_files:
-   - path: /etc/network/interfaces.d/99-tcp-tests.cfg
+   - path: /etc/network/interfaces
      content: |
           auto ens3
           iface ens3 inet dhcp