diff --git a/cmd/tailscale/cli/up.go b/cmd/tailscale/cli/up.go
index d8e24a095..30ac63f7e 100644
--- a/cmd/tailscale/cli/up.go
+++ b/cmd/tailscale/cli/up.go
@@ -267,15 +267,9 @@ func runUp(ctx context.Context, args []string) error {
 
 	if distro.Get() == distro.Synology {
 		notSupported := "not yet supported on Synology; see https://github.com/tailscale/tailscale/issues/451"
-		if upArgs.acceptRoutes {
-			return errors.New("--accept-routes is " + notSupported)
-		}
 		if upArgs.exitNodeIP != "" {
 			return errors.New("--exit-node is " + notSupported)
 		}
-		if upArgs.netfilterMode != "off" {
-			return errors.New("--netfilter-mode values besides \"off\" " + notSupported)
-		}
 	}
 
 	prefs, err := prefsFromUpArgs(upArgs, warnf, st, runtime.GOOS)