Hi Guys,
I am trying to use ovs-tcpdump in my project. Everything working great
exception the --direction option.
Following are the two problem i noticed.
1. with --direction= out - Both the direction packets are getting
captured. Both echo request and echo reply. I would expect only one
direction. Please see the tcpdump dump log below. I found a problem and
solution for it. in this case both select_dst_port and select_src_port
are being set. But i would expected only one to be set based on the
direction.
==========================================
root@cep1:/usr/local/var/run/openvswitch# ovs-vsctl list mirror
_uuid : ddceeaae-b886-43a8-a878-72e91cb85752
external_ids : {}
name : m_local-hw
output_port : e8032c14-b628-4020-bfed-7f21ec635a3b
output_vlan : []
select_all : false
select_dst_port : [8e3aa9ba-55e0-47ee-a043-32c83c0e70f1]
select_src_port : [8e3aa9ba-55e0-47ee-a043-32c83c0e70f1]
select_vlan : []
snaplen : []
statistics : {tx_bytes=12966, tx_packets=103}
root@cep1:/usr/local/var/run/openvswitch#
===============================
root@cep1:/usr/local/var/run/openvswitch# /usr/bin/python3
/usr/bin/ovs-tcpdump -i local-hw --direction=*out*
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on milocal-hw, link-type EN10MB (Ethernet), capture size
262144 bytes
04:40:36.268548 LLDP, length 103: openflow:25501357089722490
04:40:36.303271 IP6 :: > ff02::1:ffaf:dc5a: ICMP6, neighbor
solicitation, who has fe80::d80b:78ff:feaf:dc5a, length 32
04:40:36.888246 IP ip-172-16-16-170.ec2.internal >
ip-172-16-16-27.ec2.internal: ICMP echo request, id 1927, seq 460, length 64
04:40:36.889004 IP ip-172-16-16-27.ec2.internal >
ip-172-16-16-170.ec2.internal: ICMP echo reply, id 1927, seq 460, length 64
04:40:37.311317 IP6 fe80::d80b:78ff:feaf:dc5a > ff02::16: HBH ICMP6,
multicast listener report v2, 1 group record(s), length 28
04:40:37.311330 IP6 fe80::d80b:78ff:feaf:dc5a > ip6-allrouters: ICMP6,
router solicitation, length 16
04:40:37.855279 IP6 fe80::d80b:78ff:feaf:dc5a > ff02::16: HBH ICMP6,
multicast listener report v2, 1 group record(s), length 28
04:40:37.889461 IP ip-172-16-16-170.ec2.internal >
ip-172-16-16-27.ec2.internal: ICMP echo request, id 1927, seq 461, length 64
04:40:37.890400 IP ip-172-16-16-27.ec2.internal >
ip-172-16-16-170.ec2.internal: ICMP echo reply, id 1927, seq 461, length 64
04:40:38.304665 LLDP, length 110: openflow:25501357089722490
04:40:38.304749 LLDP, length 103: openflow:25501357089722490
04:40:38.890917 IP ip-172-16-16-170.ec2.internal >
ip-172-16-16-27.ec2.internal: ICMP echo request, id 1927, seq 462, length 64
04:40:38.891637 IP ip-172-16-16-27.ec2.internal >
ip-172-16-16-170.ec2.internal: ICMP echo reply, id 1927, seq 462, length 64
13 packets captured
13 packets received by filter
0 packets dropped by kernel
root@cep1:/usr/local/var/run/openvswitch#
===============================
2. Second problem has more problem. I don't see any traffic being
captured even though all configurations looks okay. Please see the
below logs. It says 0 captured and 75 packets received.
==================================================
root@cep1:/usr/local/var/run/openvswitch# ovs-vsctl list mirror
_uuid : 43efcee8-f5ee-4acb-be30-521387fdbc32
external_ids : {}
name : m_local-hw
output_port : ae824854-2262-4889-9fd2-d7e5657fd9b6
output_vlan : []
select_all : false
select_dst_port : [8e3aa9ba-55e0-47ee-a043-32c83c0e70f1]
select_src_port : [8e3aa9ba-55e0-47ee-a043-32c83c0e70f1]
select_vlan : []
snaplen : []
statistics : {}
root@cep1:/usr/local/var/run/openvswitch#
==================================================
root@cep1:/usr/local/var/run/openvswitch# /usr/bin/python3
/usr/bin/ovs-tcpdump -i local-hw --direction=*in *
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on milocal-hw, link-type EN10MB (Ethernet), capture size
262144 bytes
*0 packets captured
75 packets received by filter*
0 packets dropped by kernel
root@cep1:/usr/local/var/run/openvswitch#
===================================================
Could you guys please take your time and help me fix the problem.
Thanks for your help.
Thanks,
Pushpadant
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