diff -r 18e1e1c3aaf1 rc/bin/cpurc
--- a/rc/bin/cpurc	Tue Apr 06 14:43:38 2021 +0200
+++ b/rc/bin/cpurc	Wed Apr 07 00:39:55 2021 -0700
@@ -59,7 +59,8 @@
 		addrs=`{ndb/query -a sys $sysname ether}
 		if(! ~ $#addrs 0){
 			for(ether in /net/ether*){
-				addr=`{cat $ether/addr}
+				if (test -d $ether)
+					addr=`{cat $ether/addr}
 				switch($addr){
 				case $addrs
 					# try /lib/ndb first, then do dhcp/slaac
diff -r 18e1e1c3aaf1 rc/bin/nusbrc
--- a/rc/bin/nusbrc	Tue Apr 06 14:43:38 2021 +0200
+++ b/rc/bin/nusbrc	Wed Apr 07 00:39:55 2021 -0700
@@ -14,8 +14,9 @@
 		case *01
 			nusb/audio $id
 		case *02
-			# serial and ethernet
-			nusb/serial $id
+			# serial and ethernet: 0xff0202 is RNDIS, handled by nusbrc
+			if (! ~ $4 ff0202)
+				nusb/serial $id
 			# handled /sys/src/9/boot/nusbrc
 			# nusb/ether $id
 		case *03
diff -r 18e1e1c3aaf1 sys/src/cmd/nusb/ether/ether.c
--- a/sys/src/cmd/nusb/ether/ether.c	Tue Apr 06 14:43:38 2021 +0200
+++ b/sys/src/cmd/nusb/ether/ether.c	Wed Apr 07 00:39:55 2021 -0700
@@ -849,7 +849,7 @@
 
 	nerr = 0;
 	for(;;){
-		/* receive allocates buffer and calls etheriq(b, 1); */
+		/* receive allocates buffer and calls etheriq(b); */
 		if((*epreceive)(epin) < 0){
 			rerrstr(err, sizeof(err));
 			if(strstr(err, "interrupted") || strstr(err, "timed out"))