diff -up gpxe-1.0.1/src/drivers/net/virtio-net.c.framelength gpxe-1.0.1/src/drivers/net/virtio-net.c
--- gpxe-1.0.1/src/drivers/net/virtio-net.c.framelength	2010-06-29 15:31:33.000000000 -0400
+++ gpxe-1.0.1/src/drivers/net/virtio-net.c	2010-12-09 15:21:41.840551913 -0500
@@ -170,7 +170,7 @@ static void virtnet_transmit(struct nic 
    list[0].addr = (char*)&tx_virtio_hdr;
    list[0].length = sizeof(struct virtio_net_hdr);
    list[1].addr = (char*)&tx_eth_frame;
-   list[1].length = ETH_FRAME_LEN;
+   list[1].length = sizeof(tx_eth_frame.hdr) + len;
 
    vring_add_buf(&virtqueue[TX_INDEX], list, 2, 0, 0, 0);