From: Tommy Christensen But as stated in bonding.txt, the ARP monitor requires the underlying driver to update dev->trans_start and dev->last_rx. The patch below adds the required functionality to the TUN/TAP driver. Please test if this helps in your case. Signed-off-by: Andrew Morton --- 25-akpm/drivers/net/tun.c | 2 ++ 1 files changed, 2 insertions(+) diff -puN drivers/net/tun.c~tun-tan-arp-monitor-support drivers/net/tun.c --- 25/drivers/net/tun.c~tun-tan-arp-monitor-support 2005-01-23 14:46:21.684022080 -0800 +++ 25-akpm/drivers/net/tun.c 2005-01-23 14:46:21.688021472 -0800 @@ -113,6 +113,7 @@ static int tun_net_xmit(struct sk_buff * /* Queue packet */ skb_queue_tail(&tun->readq, skb); + dev->trans_start = jiffies; /* Notify and wake up reader process */ if (tun->flags & TUN_FASYNC) @@ -259,6 +260,7 @@ static __inline__ ssize_t tun_get_user(s skb->ip_summed = CHECKSUM_UNNECESSARY; netif_rx_ni(skb); + tun->dev->last_rx = jiffies; tun->stats.rx_packets++; tun->stats.rx_bytes += len; _