--- /dev/null
+Index: linux-2.6.30.10/drivers/net/bcm63xx_enet.c
+===================================================================
+--- linux-2.6.30.10.orig/drivers/net/bcm63xx_enet.c 2010-02-18 12:57:05.332799586 -0500
++++ linux-2.6.30.10/drivers/net/bcm63xx_enet.c 2010-02-18 12:57:53.954051082 -0500
+@@ -1520,7 +1520,7 @@
+ actual_mtu = mtu;
+
+ /* add ethernet header + vlan tag size */
+- actual_mtu += VLAN_ETH_HLEN;
++ actual_mtu += VLAN_ETH_HLEN + VLAN_HLEN;
+
+ if (actual_mtu < 64 || actual_mtu > BCMENET_MAX_MTU)
+ return -EINVAL;