diff --git a/tcp_tests/templates/ironic_standalone/underlay--user-data-ironic.yaml b/tcp_tests/templates/ironic_standalone/underlay--user-data-ironic.yaml
index f491f35..0544ae6 100644
--- a/tcp_tests/templates/ironic_standalone/underlay--user-data-ironic.yaml
+++ b/tcp_tests/templates/ironic_standalone/underlay--user-data-ironic.yaml
@@ -55,7 +55,8 @@
    - export IRONIC_PXE_MANAGER=dnsmasq
    - export IRONIC_PXE_INTERFACE_NAME=ens4
    - export IRONIC_PXE_INTERFACE_ADDRESS={{ os_env('IRONIC_PXE_INTERFACE_ADDRESS', '10.0.175.2') }}
-   - export IRONIC_DHCP_POOL_NETMASK_PREFIX=24
+   - export IRONIC_DHCP_POOL_NETMASK={{ os_env('IRONIC_DHCP_POOL_NETMASK', '255.255.255.0') }}
+   - export IRONIC_DHCP_POOL_NETMASK_PREFIX={{ os_env('IRONIC_DHCP_POOL_NETMASK_PREFIX', '24') }}
    - export IRONIC_DHCP_POOL_START={{ os_env('IRONIC_DHCP_POOL_START', '10.0.175.100') }}
    - export IRONIC_DHCP_POOL_END={{ os_env('IRONIC_DHCP_POOL_END', '10.0.175.200') }}
    - export DNSMASQ_USE_EXTERNAL_DNS=true