diff --git a/modal/sandbox.py b/modal/sandbox.py
index a2a3ae178..4b8e059a0 100644
--- a/modal/sandbox.py
+++ b/modal/sandbox.py
@@ -129,6 +129,7 @@ async def _load(self: _Sandbox, resolver: Resolver, _existing_object_id: Optiona
                 pty_info=pty_info,
                 scheduler_placement=scheduler_placement.proto if scheduler_placement else None,
                 worker_id=config.get("worker_id"),
+                i6pn_enabled=config.get("i6pn_enabled"),
             )
 
             # Note - `resolver.app_id` will be `None` for app-less sandboxes
diff --git a/modal_proto/api.proto b/modal_proto/api.proto
index d407c0618..0ddd333b7 100644
--- a/modal_proto/api.proto
+++ b/modal_proto/api.proto
@@ -1777,6 +1777,8 @@ message Sandbox {
   oneof open_ports_oneof {
     PortSpecs open_ports = 20;
   }
+
+  bool i6pn_enabled = 21;
 }
 
 message SandboxCreateRequest {