T5561: nat: defining inbound|outbound interface should not be mandatory while configuring dNAT|sNAT rule

(cherry picked from commit ec5437913e489f40fea6bab89a6bb5f565cd1ab7)

2 files changed, 6 insertions, 14 deletions

diff --git a/smoketest/scripts/cli/test_nat.py b/smoketest/scripts/cli/test_nat.py
index 31dfcef87..703e5ab28 100755
--- a/smoketest/scripts/cli/test_nat.py
+++ b/smoketest/scripts/cli/test_nat.py
@@ -155,11 +155,6 @@ class TestNAT(VyOSUnitTestSHIM.TestCase):
         rule = '5'
         self.cli_set(src_path + ['rule', rule, 'source', 'address', '192.0.2.0/24'])
 
-        # check validate() - outbound-interface must be defined
-        with self.assertRaises(ConfigSessionError):
-            self.cli_commit()
-        self.cli_set(src_path + ['rule', rule, 'outbound-interface', 'eth0'])
-
         # check validate() - translation address not specified
         with self.assertRaises(ConfigSessionError):
             self.cli_commit()
diff --git a/src/conf_mode/nat.py b/src/conf_mode/nat.py
index 9da7fbe80..ebc434da9 100755
--- a/src/conf_mode/nat.py
+++ b/src/conf_mode/nat.py
@@ -195,11 +195,10 @@ def verify(nat):
     if dict_search('source.rule', nat):
         for rule, config in dict_search('source.rule', nat).items():
             err_msg = f'Source NAT configuration error in rule {rule}:'
-            if 'outbound_interface' not in config:
-                raise ConfigError(f'{err_msg} outbound-interface not specified')
 
-            if config['outbound_interface'] not in 'any' and config['outbound_interface'] not in interfaces():
-                Warning(f'rule "{rule}" interface "{config["outbound_interface"]}" does not exist on this system')
+            if 'outbound_interface' in config:
+                if config['outbound_interface'] not in 'any' and config['outbound_interface'] not in interfaces():
+                    Warning(f'rule "{rule}" interface "{config["outbound_interface"]}" does not exist on this system')
 
             if not dict_search('translation.address', config) and not dict_search('translation.port', config):
                 if 'exclude' not in config and 'backend' not in config['load_balance']:
@@ -218,11 +217,9 @@ def verify(nat):
         for rule, config in dict_search('destination.rule', nat).items():
             err_msg = f'Destination NAT configuration error in rule {rule}:'
 
-            if 'inbound_interface' not in config:
-                raise ConfigError(f'{err_msg}\n' \
-                                  'inbound-interface not specified')
-            elif config['inbound_interface'] not in 'any' and config['inbound_interface'] not in interfaces():
-                Warning(f'rule "{rule}" interface "{config["inbound_interface"]}" does not exist on this system')
+            if 'inbound_interface' in config:
+                if config['inbound_interface'] not in 'any' and config['inbound_interface'] not in interfaces():
+                    Warning(f'rule "{rule}" interface "{config["inbound_interface"]}" does not exist on this system')
 
             if not dict_search('translation.address', config) and not dict_search('translation.port', config) and 'redirect' not in config['translation']:
                 if 'exclude' not in config and 'backend' not in config['load_balance']: