diff -r 4136602b93e9 sys/src/9/port/devether.c
--- a/sys/src/9/port/devether.c	Wed Nov 14 11:33:52 2018 -0800
+++ b/sys/src/9/port/devether.c	Fri Nov 16 16:28:20 2018 -0600
@@ -26,6 +26,10 @@
 	ctlrno = 0;
 	if(*spec){
 		ctlrno = strtoul(spec, &conf, 10);
+		if(ctlrno == 1){
+			if(strcmp(up->user, "glenda") != 0)
+				error(Ebadspec);
+		}
 		if(ctlrno >= MaxEther)
 			error(Enodev);
 		if(conf == spec)