diff --git a/ansible/docker.yml b/ansible/docker.yml
index 698896042..1a55725f9 100644
--- a/ansible/docker.yml
+++ b/ansible/docker.yml
@@ -3,3 +3,4 @@
   hosts: docker
   roles:
     - role: docker
+      docker_daemon_mtu: "{{ external_net_name | net_mtu }}"
diff --git a/ansible/roles/docker/defaults/main.yml b/ansible/roles/docker/defaults/main.yml
index 59c3bdaf9..c43413338 100644
--- a/ansible/roles/docker/defaults/main.yml
+++ b/ansible/roles/docker/defaults/main.yml
@@ -20,3 +20,6 @@ docker_storage_thinpool_autoextend_threshold: 80
 
 # Percentage by which to extend thin-provisioned docker storage volumes.
 docker_storage_thinpool_autoextend_percent: 20
+
+# MTU to pass through to containers not using net=host
+docker_daemon_mtu: 1500
diff --git a/ansible/roles/docker/templates/daemon.json.j2 b/ansible/roles/docker/templates/daemon.json.j2
index 67eab7a81..4f229af35 100644
--- a/ansible/roles/docker/templates/daemon.json.j2
+++ b/ansible/roles/docker/templates/daemon.json.j2
@@ -1,6 +1,6 @@
 {
   "storage-driver": "devicemapper",
-  "mtu": {{ external_net_name | net_mtu }},
+  "mtu": {{ docker_daemon_mtu }},
   "storage-opts": [
     "dm.thinpooldev=/dev/mapper/{{ docker_storage_volume_group | replace('-', '--') }}-{{ docker_storage_volume_thinpool | replace('-', '--') }}",
     "dm.use_deferred_removal=true",