diff -ruN libdnet-1.11.orig/test/dnet/aton.c libdnet-1.11/test/dnet/aton.c
--- libdnet-1.11.orig/test/dnet/aton.c	2002-10-14 17:42:10.000000000 +0200
+++ libdnet-1.11/test/dnet/aton.c	2011-12-03 23:15:33.472366712 +0100
@@ -222,3 +222,15 @@
 	}
 	return (u - buf);
 }
+
+int
+vid_aton(char *string, uint16_t *vid)
+{
+	u_int i;
+	
+	/* XXX */
+	if (sscanf(string, "%i", &i) != 1 || i > 0xffff)
+		return (-1);
+	*vid = htons(i & 0xffff);
+	return (0);
+}
diff -ruN libdnet-1.11.orig/test/dnet/dnet.8 libdnet-1.11/test/dnet/dnet.8
--- libdnet-1.11.orig/test/dnet/dnet.8	2002-04-01 09:11:34.000000000 +0200
+++ libdnet-1.11/test/dnet/dnet.8	2011-12-03 23:10:04.055399746 +0100
@@ -42,6 +42,7 @@
 .Op Nm type Ar type 
 .Op Nm src Ar mac
 .Op Nm dst Ar mac
+.Op Nm vid Ar vlan_id
 .Xc
 Prepend the data read from standard input with an Ethernet header on
 standard output. The Ethernet
diff -ruN libdnet-1.11.orig/test/dnet/eth.c libdnet-1.11/test/dnet/eth.c
--- libdnet-1.11.orig/test/dnet/eth.c	2002-02-08 08:43:53.000000000 +0100
+++ libdnet-1.11/test/dnet/eth.c	2011-12-03 23:16:31.263588754 +0100
@@ -23,7 +23,7 @@
 void
 eth_usage(void)
 {
-	fprintf(stderr, "Usage: dnet eth [type|src|dst <value>] ... \n");
+	fprintf(stderr, "Usage: dnet eth [type|src|dst|vid <value>] ... \n");
 	exit(1);
 }
 
@@ -31,10 +31,11 @@
 eth_main(int argc, char *argv[])
 {
 	struct eth_hdr *eth;
+	uint16_t type, vid;
 	struct addr addr;
-	u_char *p, buf[ETH_LEN_MAX];	/* XXX */
+	u_char *p, buf[ETH_LEN_MAX + 4];	/* XXX */
 	char *name, *value;
-	int c, len;
+	int c, len, is_tagged = 0;
 
 	eth = (struct eth_hdr *)buf;
 	memset(eth, 0, sizeof(*eth));
@@ -45,8 +46,13 @@
 		value = argv[c + 1];
 
 		if (strcmp(name, "type") == 0) {
-			if (type_aton(value, &eth->eth_type) < 0)
+			if (type_aton(value, &type) < 0)
 				eth_usage();
+
+			if (is_tagged)
+				memmove(((uint8_t *)&eth->eth_type) + 4, &type, sizeof(uint16_t));
+			else
+				eth->eth_type = type;
 		} else if (strcmp(name, "src") == 0) {
 			if (addr_aton(value, &addr) < 0)
 				eth_usage();
@@ -55,6 +61,14 @@
 			if (addr_aton(value, &addr) < 0)
 				eth_usage();
 			memcpy(&eth->eth_dst, &addr.addr_eth, ETH_ADDR_LEN);
+		} else if (strcmp(name, "vid") == 0) {
+			if (is_tagged)
+				eth_usage();
+			memmove(buf + ETH_HDR_LEN - ETH_TYPE_LEN + 4, buf + ETH_HDR_LEN - ETH_TYPE_LEN, ETH_LEN_MAX - ETH_HDR_LEN + ETH_TYPE_LEN);
+			eth->eth_type = htons(ETH_TYPE_8021Q);
+			vid_aton(value, &vid);
+			memmove(buf + ETH_HDR_LEN, &vid, sizeof(uint16_t));
+			is_tagged = 1;
 		} else
 			eth_usage();
 	}
@@ -67,8 +81,8 @@
 	if (isatty(STDIN_FILENO))
 		errx(1, "can't read Ethernet payload from tty");
 	
-	p = buf + ETH_HDR_LEN;
-	len = sizeof(buf) - (p - buf);
+	p = buf + ETH_HDR_LEN + (is_tagged ? 4 : 0);
+	len = sizeof(buf) - (p - buf) - (is_tagged ? 0 : 4);
 	
 	while ((c = read(STDIN_FILENO, p, len)) > 0) {
 		p += c;