Thanks a lot for your answer! I hope now I understand why I don't see traffic but I would like to know how can I dump inter-switch traffic.
In hardware switches it can be done with port/vlan mirroring. Best regards, Max 2013/7/30 Ben Pfaff <b...@nicira.com> > On Tue, Jul 30, 2013 at 05:55:27PM +0300, Max Mazur wrote: > > 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 > > OVS is a switch, not a hub, so it's not going to forward every packet > to every port. Presumably no unicast traffic is going to or from > br-int, because you have not added any IP addresses there. >
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