Hi,

We have encountered a strange behavior. After restarting the controller process 
and even after removing and reinserting the datapath module, ARP packets are 
forwarded from dp0 to the real port intermittently.
tcpdump confirms that the ARP request is seen on dp0, but not on the physical 
port (eth1).
At the same time the following sequence on log messages appear:

Oct 18 12:22:54|00344|netlink_socket|DBG|nl_sock_recv__ (Success): nl(len:24, 
type=30(ovs_packet), flags=0, seq=0, pid=0(0:0)),genl(cmd=1,version=1)
Oct 18 12:22:54|00345|dpif|DBG|system@dp0: miss upcall:
in_port(0),eth(src=00:23:20:fc:70:43,dst=ff:ff:ff:ff:ff:ff),eth_type(0x0806),arp(sip=172.28.0.1,tip=172.28.0.19,op=1,sha=00:23:20:fc:70:43,tha=00:00:00:00:00:00)
00:23:20:fc:70:43 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: 
Request who-has 172.28.0.19 tell 172.28.0.1, length 28
Oct 18 12:22:54|00346|ofproto_dpif|WARN|bridge dp0: received packet on unknown 
port 65534
Oct 18 12:22:54|00347|netlink_socket|DBG|nl_sock_transact_multiple__ (Success): 
nl(len:140, type=30(ovs_packet), flags=1[REQUEST], seq=4e9d5835, 
pid=75500397(2925:18)),genl(cmd=3,version=1)
Oct 18 12:22:54|00348|netlink_socket|DBG|nl_sock_transact_multiple__ (Success): 
nl(len:92, type=29(ovs_flow), flags=5[REQUEST][ACK], seq=4e9d5836, 
pid=75500397(2925:18)),genl(cmd=1,version=1)
Oct 18 12:22:54|00349|netlink_socket|DBG|nl_sock_recv__ (Success): nl(len:36, 
type=2(error), flags=0, seq=4e9d5836, pid=75500397(2925:18)) error(0, 
in-reply-to(nl(len:92, type=29(ovs_flow), flags=5[REQUEST][ACK], seq=4e9d5836, 
pid=75500397(2925:18))))

There clearly is something strange going on. How can the dp receive something 
on an unknown port?

Any hints?

Regards
Andreas
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