diff --git a/iocage/lib/Config/Jail/BaseConfig.py b/iocage/lib/Config/Jail/BaseConfig.py
index 1cfe1be1..3fd685dd 100644
--- a/iocage/lib/Config/Jail/BaseConfig.py
+++ b/iocage/lib/Config/Jail/BaseConfig.py
@@ -664,9 +664,6 @@ def __dir__(self) -> typing.List[str]:
             if not prop.startswith("_"):
                 properties.add(prop)
 
-        for key in self.data.keys():
-            properties.add(key)
-
         return list(properties)
 
     def keys(self) -> typing.KeysView[str]:
@@ -696,8 +693,12 @@ def __len__(self) -> int:
 
     @property
     def all_properties(self) -> typing.List[str]:
-        """Return a list of all user configured settings."""
-        return list(self._sorted_user_properties)
+        """Return a list of config object attributes."""
+        properties: typing.Set[str] = set()
+        properties = properties.union(self.data.keys())
+        special_properties = iocage.lib.Config.Jail.Properties.properties
+        properties = properties.union(special_properties)
+        return list(properties)
 
     @property
     def _sorted_user_properties(self) -> typing.List[str]:
diff --git a/iocage/lib/Config/Jail/JailConfig.py b/iocage/lib/Config/Jail/JailConfig.py
index 872e625e..a0cbc37f 100644
--- a/iocage/lib/Config/Jail/JailConfig.py
+++ b/iocage/lib/Config/Jail/JailConfig.py
@@ -92,6 +92,21 @@ def __setitem__(
         skip_on_error: bool=False
     ) -> None:
         """Set a configuration value."""
+        # require the config property to be defined in the defaults
+        key_is_default = key in self.host.defaults.config.keys()
+        key_is_setter = f"_set_{key}" in dict.__dir__(self)
+        key_is_special = key in iocage.lib.Config.Jail.Properties.properties
+
+        if (key_is_default or key_is_setter or key_is_special) is False:
+            err = iocage.lib.errors.UnknownJailConfigProperty(
+                jail=self.jail,
+                key=key,
+                logger=self.logger,
+                level=("warn" if skip_on_error else None)
+            )
+            if skip_on_error is False:
+                raise err
+
         BaseConfig.__setitem__(
             self,
             key=key,
@@ -118,5 +133,6 @@ def all_properties(self) -> list:
         """Return a list of all config properties (default and custom)."""
         jail_config_properties = set(super().all_properties)
         default_config_properties = set(
-            self.host.default_config.all_properties)
+            self.host.default_config.all_properties
+        )
         return sorted(list(jail_config_properties | default_config_properties))
diff --git a/iocage/lib/Config/Jail/Properties/__init__.py b/iocage/lib/Config/Jail/Properties/__init__.py
index d8910f96..db90daab 100644
--- a/iocage/lib/Config/Jail/Properties/__init__.py
+++ b/iocage/lib/Config/Jail/Properties/__init__.py
@@ -34,6 +34,12 @@
     'iocage.lib.Config.Jail.Properties.Resolver.ResolverProp'
 ]
 
+properties: typing.List[str] = [
+    "ip4_addr",
+    "ip6_addr",
+    "interfaces",
+    "resolver"
+] + ResourceLimit.properties
 
 def _get_class(property_name: str) -> Property:
 
diff --git a/iocage/lib/errors.py b/iocage/lib/errors.py
index d09cc80d..c178e0dd 100644
--- a/iocage/lib/errors.py
+++ b/iocage/lib/errors.py
@@ -388,6 +388,23 @@ def __init__(  # noqa: T484
         IocageException.__init__(self, msg, *args, **kwargs)
 
 
+class UnknownJailConfigProperty(IocageException, KeyError):
+    """Raised when a unknown jail config property was used."""
+
+    def __init__(  # noqa: T484
+        self,
+        key: str,
+        jail: iocage.lib.Jail.JailGenerator,
+        *args,
+        **kwargs
+    ) -> None:
+        msg = (
+            f"The config property '{key}' "
+            f"of jail '{jail.humanreadable_name}' is unknown."
+        )
+        IocageException.__init__(self, msg, *args, **kwargs)
+
+
 # Backup