Hi!
Could you please explain me such strange situation:
I have Openstack with OVS and VMs up and running
OVS is configured with GRE
I have compute node (where VMs are started) with the following OVS
configuration:
alias ovs='ovs-vsctl'
ovs show
7f013a19-b6d5-4038-8ba8-ae548b581605
...
Bridge br-int
Port "qvo22eb488a-9a"
tag: 1
Interface "qvo22eb488a-9a"
Port br-int
Interface br-int
type: internal
Port "qvo6715963b-e7"
tag: 1
Interface "qvo6715963b-e7"
Port patch-tun
Interface patch-tun
type: patch
options: {peer=patch-int}
Bridge br-tun
Port patch-int
Interface patch-int
type: patch
options: {peer=patch-tun}
Port "gre-2"
Interface "gre-2"
type: gre
options: {in_key=flow, out_key=flow,
remote_ip="192.168.4.253"}
Port br-tun
Interface br-tun
type: internal
ovs_version: "1.10.0"
As you can see, I have 2 ports in br-int:
* qvo22eb488a-9a
* qvo6715963b-e7
These ports are attached to VMs with ip addresses 192.168.1.2 and
192.168.1.4
ip link show dev qvo22eb488a-9a
35: qvo22eb488a-9a: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500
qdisc pfifo_fast state UP qlen 1000
link/ether 3a:01:46:ad:33:cc brd ff:ff:ff:ff:ff:ff
[root@compute1 ~]# ip link show dev qvo6715963b-e7
27: qvo6715963b-e7: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500
qdisc pfifo_fast state UP qlen 1000
link/ether ee:da:16:bd:93:ac brd ff:ff:ff:ff:ff:ff
I'm trying to understand traffic flow with tcpdump and got unexpected (for
me) results (for one VM. other have same results):
tcpdump -n -i qvo22eb488a-9a
listening on qvo22eb488a-9a, link-type EN10MB (Ethernet), capture size
65535 bytes
17:20:35.139298 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
Request from fa:16:3e:27:07:47, length 280
17:20:36.905414 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
Request from fa:16:3e:5f:4f:28, length 280
17:20:36.906830 IP 192.168.1.3.bootps > 192.168.1.4.bootpc: BOOTP/DHCP,
Reply, length 321
17:20:36.906961 IP 192.168.1.4 > 192.168.1.3: ICMP 192.168.1.4 udp port
bootpc unreachable, length 357
17:20:43.755827 IP 192.168.1.3 > 192.168.1.4: ICMP echo request, id 11567,
seq 2, length 64
So I see traffic.
BUT I can't see it on OVS ifaces:
tcpdump -n -i br-int
listening on br-int, link-type EN10MB (Ethernet), capture size 65535 bytes
0 packets captured
0 packets received by filter
0 packets dropped by kernel
[root@compute1 ~]# tcpdump -n -i br-tun
0 packets captured
0 packets received by filter
0 packets dropped by kernel
Could you please explain me how can I use tcpdump (or other pcap-based
tools) with OVS?
BTW, how can I dump traffic on OVS-only ports, which does not have system
interfaces.
Best Regards,
Max Mazur
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