T6884: adds mtu option for container networks

3 files changed, 23 insertions, 0 deletions

diff --git a/interface-definitions/container.xml.in b/interface-definitions/container.xml.in
index 3dd1b3249..2441ac410 100644
--- a/interface-definitions/container.xml.in
+++ b/interface-definitions/container.xml.in
@@ -501,6 +501,7 @@
         </properties>
         <children>
           #include <include/generic-description.xml.i>
+          #include <include/interface/mtu-68-1500.xml.i>
           <leafNode name="prefix">
             <properties>
               <help>Prefix which allocated to that network</help>
diff --git a/smoketest/scripts/cli/test_container.py b/smoketest/scripts/cli/test_container.py
index c03b9eb44..0541384da 100755
--- a/smoketest/scripts/cli/test_container.py
+++ b/smoketest/scripts/cli/test_container.py
@@ -224,6 +224,22 @@ class TestContainer(VyOSUnitTestSHIM.TestCase):
         n = cmd_to_json(f'sudo podman network inspect {net_name}')
         self.assertEqual(n['dns_enabled'], False)
 
+    def test_network_mtu(self):
+        prefix = '192.0.2.0/24'
+        base_name = 'ipv4'
+        net_name = 'NET01'
+
+        self.cli_set(base_path + ['network', net_name, 'prefix', prefix])
+        self.cli_set(base_path + ['network', net_name, 'mtu', '1280'])
+
+        name = f'{base_name}-2'
+        self.cli_set(base_path + ['name', name, 'image', cont_image])
+        self.cli_set(base_path + ['name', name, 'network', net_name, 'address', str(ip_interface(prefix).ip + 2)])
+        self.cli_commit()
+
+        n = cmd_to_json(f'sudo podman network inspect {net_name}')
+        self.assertEqual(n['options']['mtu'], '1280')
+
     def test_uid_gid(self):
         cont_name = 'uid-test'
         gid = '100'
diff --git a/src/conf_mode/container.py b/src/conf_mode/container.py
index 14387cbbf..a7dc33d9d 100755
--- a/src/conf_mode/container.py
+++ b/src/conf_mode/container.py
@@ -419,12 +419,18 @@ def generate(container):
                 'dns_enabled': True,
                 'ipam_options': {
                     'driver': 'host-local'
+                },
+                'options': {
+                    'mtu': '1500'
                 }
             }
 
             if 'no_name_server' in network_config:
                 tmp['dns_enabled'] = False
 
+            if 'mtu' in network_config:
+                tmp['options']['mtu'] = network_config['mtu']
+
             for prefix in network_config['prefix']:
                 net = {'subnet': prefix, 'gateway': inc_ip(prefix, 1)}
                 tmp['subnets'].append(net)