Index: head/sys/fs/nfs/nfs_commonsubs.c
===================================================================
--- head/sys/fs/nfs/nfs_commonsubs.c
+++ head/sys/fs/nfs/nfs_commonsubs.c
@@ -68,6 +68,7 @@
 int nfsrv_lease = NFSRV_LEASE;
 int ncl_mbuf_mlen = MLEN;
 int nfsd_enable_stringtouid = 0;
+int nfsd_enable_uidtostring = 0;
 NFSNAMEIDMUTEX;
 NFSSOCKMUTEX;
 extern int nfsrv_lughashsize;
@@ -2561,7 +2562,7 @@
 
 	cnt = 0;
 tryagain:
-	if (nfsrv_dnsnamelen > 0) {
+	if (nfsrv_dnsnamelen > 0 && !nfsd_enable_uidtostring) {
 		/*
 		 * Always map nfsrv_defaultuid to "nobody".
 		 */
@@ -2671,7 +2672,7 @@
 	cnt = 0;
 	uid = oldcred->cr_uid;
 tryagain:
-	if (nfsrv_dnsnamelen > 0) {
+	if (nfsrv_dnsnamelen > 0 && !nfsd_enable_uidtostring) {
 		hp = NFSUSERHASH(uid);
 		mtx_lock(&hp->mtx);
 		TAILQ_FOREACH(usrp, &hp->lughead, lug_numhash) {
@@ -2823,7 +2824,7 @@
 
 	cnt = 0;
 tryagain:
-	if (nfsrv_dnsnamelen > 0) {
+	if (nfsrv_dnsnamelen > 0 && !nfsd_enable_uidtostring) {
 		/*
 		 * Always map nfsrv_defaultgid to "nogroup".
 		 */
Index: head/sys/fs/nfsserver/nfs_nfsdport.c
===================================================================
--- head/sys/fs/nfsserver/nfs_nfsdport.c
+++ head/sys/fs/nfsserver/nfs_nfsdport.c
@@ -87,6 +87,7 @@
 extern int nfsrv_issuedelegs;
 extern int nfsrv_dolocallocks;
 extern int nfsd_enable_stringtouid;
+extern int nfsd_enable_uidtostring;
 
 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "NFS server");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
@@ -103,6 +104,8 @@
     0, "Debug level for NFS server");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
     &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
+SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_uidtostring, CTLFLAG_RW,
+    &nfsd_enable_uidtostring, 0, "Make nfsd always send numeric owner_names");
 
 #define	MAX_REORDERED_RPC	16
 #define	NUM_HEURISTIC		1031