diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 21cc602..126d83f 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -36,7 +36,7 @@ def read_sys_net(devname, path, translate=None, enoent=None, keyerror=None):
     try:
         contents = util.load_file(sys_dev_path(devname, path))
     except (OSError, IOError) as e:
-        if getattr(e, 'errno', None) == errno.ENOENT:
+        if getattr(e, 'errno', None) in (errno.ENOENT, errno.ENOTDIR):
             if enoent is not None:
                 return enoent
         raise