Index: head/lib/libstand/bootp.h
===================================================================
--- head/lib/libstand/bootp.h
+++ head/lib/libstand/bootp.h
@@ -108,6 +108,7 @@
 #define TAG_T2			((unsigned char)  59)
 #define TAG_CLASSID		((unsigned char)  60)
 #define TAG_CLIENTID		((unsigned char)  61)
+#define TAG_USER_CLASS		((unsigned char)  77)
 #endif
 
 #define TAG_END			((unsigned char) 255)
Index: head/lib/libstand/bootp.c
===================================================================
--- head/lib/libstand/bootp.c
+++ head/lib/libstand/bootp.c
@@ -146,16 +146,20 @@
 		bp->bp_vend[7] = TAG_CLASSID;
 		bp->bp_vend[8] = 9;
 		bcopy("PXEClient", &bp->bp_vend[9], 9);
-		bp->bp_vend[18] = TAG_PARAM_REQ;
-		bp->bp_vend[19] = 7;
-		bp->bp_vend[20] = TAG_ROOTPATH;
-		bp->bp_vend[21] = TAG_HOSTNAME;
-		bp->bp_vend[22] = TAG_SWAPSERVER;
-		bp->bp_vend[23] = TAG_GATEWAY;
-		bp->bp_vend[24] = TAG_SUBNET_MASK;
-		bp->bp_vend[25] = TAG_INTF_MTU;
-		bp->bp_vend[26] = TAG_SERVERID;
-		bp->bp_vend[27] = TAG_END;
+		bp->bp_vend[18] = TAG_USER_CLASS;
+		bp->bp_vend[19] = 8;
+		bp->bp_vend[20] = 7;
+		bcopy("FREEBSD", &bp->bp_vend[21], 7);
+		bp->bp_vend[28] = TAG_PARAM_REQ;
+		bp->bp_vend[29] = 7;
+		bp->bp_vend[30] = TAG_ROOTPATH;
+		bp->bp_vend[31] = TAG_HOSTNAME;
+		bp->bp_vend[32] = TAG_SWAPSERVER;
+		bp->bp_vend[33] = TAG_GATEWAY;
+		bp->bp_vend[34] = TAG_SUBNET_MASK;
+		bp->bp_vend[35] = TAG_INTF_MTU;
+		bp->bp_vend[36] = TAG_SERVERID;
+		bp->bp_vend[37] = TAG_END;
 	} else
 		bp->bp_vend[7] = TAG_END;
 #else