On Thu, Mar 31, 2016 at 8:37 AM, Mugunthan V N <[email protected]> wrote:
> On Thursday 31 March 2016 01:17 AM, Peter Korsgaard wrote:
>>>>>>> "Mugunthan" == Mugunthan V N <[email protected]> writes:
>>
>> Hi,
>>
>> > You had received these packets as tcpdump will enable promiscuous mode
>> > so that you receive all the packets from the wire.
>>
>> FYI, you can use the -p option to tcpdump to not put the interface into
>> promiscuous mode.
>>
>
> Thanks for the information Peter Korsgaard.
>
> Yegor, can you provide tcpdump using -p as well in Grygorii commands.
Before VLAN configuration:
# switch-config -d
cpsw hw version 1.12 (0)
0 : type: vlan , vid = 1, untag_force = 0x3, reg_mcast = 0x3,
unreg_mcast = 0x0, member_list = 0x3
1 : type: mcast, vid = 1, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x3
2 : type: ucast, vid = 1, addr = 74:6a:8f:00:16:12, ucast_type =
persistant, port_num = 0x0, Secure
3 : type: vlan , vid = 0, untag_force = 0x7, reg_mcast = 0x0,
unreg_mcast = 0x0, member_list = 0x7
4 : type: mcast, vid = 1, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x3
5 : type: vlan , vid = 2, untag_force = 0x5, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
6 : type: mcast, vid = 2, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x5
7 : type: ucast, vid = 2, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0, Secure
8 : type: mcast, vid = 2, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x5
After VLAN configuration:
# switch-config -d
cpsw hw version 1.12 (0)
0 : type: vlan , vid = 1, untag_force = 0x3, reg_mcast = 0x3,
unreg_mcast = 0x0, member_list = 0x3
1 : type: mcast, vid = 1, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x3
2 : type: ucast, vid = 1, addr = 74:6a:8f:00:16:12, ucast_type =
persistant, port_num = 0x0, Secure
3 : type: vlan , vid = 0, untag_force = 0x7, reg_mcast = 0x0,
unreg_mcast = 0x0, member_list = 0x7
4 : type: mcast, vid = 1, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x3
5 : type: vlan , vid = 2, untag_force = 0x5, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
6 : type: mcast, vid = 2, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x5
7 : type: ucast, vid = 2, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0, Secure
8 : type: mcast, vid = 2, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x5
9 : type: vlan , vid = 100, untag_force = 0x0, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
10 : type: ucast, vid = 100, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0
11 : type: mcast, vid = 100, addr = ff:ff:ff:ff:ff:ff, mcast_state =
f, no super, port_mask = 0x5
12 : type: mcast, vid = 2, addr = 01:80:c2:00:00:21, mcast_state = f,
no super, port_mask = 0x5
During mulitcast receive:
# switch-config -d
cpsw hw version 1.12 (0)
0 : type: vlan , vid = 1, untag_force = 0x3, reg_mcast = 0x3,
unreg_mcast = 0x0, member_list = 0x3
1 : type: mcast, vid = 1, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x3
2 : type: ucast, vid = 1, addr = 74:6a:8f:00:16:12, ucast_type =
persistant, port_num = 0x0, Secure
3 : type: vlan , vid = 0, untag_force = 0x7, reg_mcast = 0x0,
unreg_mcast = 0x0, member_list = 0x7
4 : type: mcast, vid = 1, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x3
5 : type: vlan , vid = 2, untag_force = 0x5, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
6 : type: mcast, vid = 2, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x5
7 : type: ucast, vid = 2, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0, Secure
8 : type: mcast, vid = 2, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x5
9 : type: vlan , vid = 100, untag_force = 0x0, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
10 : type: ucast, vid = 100, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0
11 : type: mcast, vid = 100, addr = ff:ff:ff:ff:ff:ff, mcast_state =
f, no super, port_mask = 0x5
12 : type: mcast, vid = 2, addr = 01:80:c2:00:00:21, mcast_state = f,
no super, port_mask = 0x5
13 : type: mcast, vid = 2, addr = 01:00:5e:03:1d:47, mcast_state = f,
no super, port_mask = 0x5
14 : type: ucast, vid = 100, addr = 66:22:04:bc:90:26, ucast_type =
untouched , port_num = 0x2
After multicast receive use case:
# switch-config -d
cpsw hw version 1.12 (0)
0 : type: vlan , vid = 1, untag_force = 0x3, reg_mcast = 0x3,
unreg_mcast = 0x0, member_list = 0x3
1 : type: mcast, vid = 1, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x3
2 : type: ucast, vid = 1, addr = 74:6a:8f:00:16:12, ucast_type =
persistant, port_num = 0x0, Secure
3 : type: vlan , vid = 0, untag_force = 0x7, reg_mcast = 0x0,
unreg_mcast = 0x0, member_list = 0x7
4 : type: mcast, vid = 1, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x3
5 : type: vlan , vid = 2, untag_force = 0x5, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
6 : type: mcast, vid = 2, addr = ff:ff:ff:ff:ff:ff, mcast_state = f,
no super, port_mask = 0x5
7 : type: ucast, vid = 2, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0, Secure
8 : type: mcast, vid = 2, addr = 01:00:5e:00:00:01, mcast_state = f,
no super, port_mask = 0x5
9 : type: vlan , vid = 100, untag_force = 0x0, reg_mcast = 0x5,
unreg_mcast = 0x0, member_list = 0x5
10 : type: ucast, vid = 100, addr = 74:6a:8f:00:16:13, ucast_type =
persistant, port_num = 0x0
11 : type: mcast, vid = 100, addr = ff:ff:ff:ff:ff:ff, mcast_state =
f, no super, port_mask = 0x5
12 : type: mcast, vid = 2, addr = 01:80:c2:00:00:21, mcast_state = f,
no super, port_mask = 0x5
15 : type: ucast, vid = 100, addr = 66:22:04:bc:90:26, ucast_type =
untouched , port_num = 0x2
Both tcpdumps with -p option showed no packets. If I execute ping, I
can see related ICMP packets. addr = 66:22:04:bc:90:26 is PandaBoards
MAC.
Btw I've attached my test scripts (mcastr.py - multicast receiver and
mcastt.py - multicast transmitter). Could you reproduce my setup?
Thanks.
Yegor
import socket
import struct
import sys
multicast_group = '224.3.29.71'
server_address = ('', 10000)
# Create the socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Bind to the server address
sock.bind(server_address)
# Tell the operating system to add the socket to the multicast group
# on all interfaces.
group = socket.inet_aton(multicast_group)
mreq = struct.pack('4sL', group, socket.INADDR_ANY)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
# Receive/respond loop
while True:
print >>sys.stderr, '\nwaiting to receive message'
data, address = sock.recvfrom(1024)
print >>sys.stderr, 'received %s bytes from %s' % (len(data), address)
print >>sys.stderr, data
print >>sys.stderr, 'sending acknowledgement to', address
sock.sendto('ack', address)
import socket
import struct
import sys
message = 'very important data'
multicast_group = ('224.3.29.71', 10000)
# Create the datagram socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Set a timeout so the socket does not block indefinitely when trying
# to receive data.
sock.settimeout(0.2)
# Set the time-to-live for messages to 1 so they do not go past the
# local network segment.
ttl = struct.pack('b', 1)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl)
try:
# Send data to the multicast group
print >>sys.stderr, 'sending "%s"' % message
sent = sock.sendto(message, multicast_group)
# Look for responses from all recipients
while True:
print >>sys.stderr, 'waiting to receive'
try:
data, server = sock.recvfrom(16)
except socket.timeout:
print >>sys.stderr, 'timed out, no more responses'
break
else:
print >>sys.stderr, 'received "%s" from %s' % (data, server)
finally:
print >>sys.stderr, 'closing socket'
sock.close()
