hi all:
I have set up quantum+floodlight, there are a compute node and a
controller, so I create a VM in the compute node, but the VM(100.0.0.4) can
not ping its gateway(100.0.0.1) in the controller node.
When the VM send a ARP request to OVS of the compute node, a packet_in
request is sent to the controller, then the controller send a packet_out
response to the OVS, telling it to flood the ARP request.
I run tcpdump at both br-int and br-tun interface, packets are captured at
br-int, but no packets are captured at br-tun:
root@node1:/var/log/openvswitch# tcpdump -i br-int -nn
tcpdump: WARNING: br-int: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on br-int, link-type EN10MB (Ethernet), capture size 65535 bytes
14:26:45.485978 ARP, Request who-has 100.0.0.1 tell 100.0.0.4, length 28
14:26:46.482442 ARP, Request who-has 100.0.0.1 tell 100.0.0.4, length 28
14:26:47.482416 ARP, Request who-has 100.0.0.1 tell 100.0.0.4, length 28
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernel
root@node1:/var/log/openvswitch# tcpdump -i br-tun -nn
tcpdump: WARNING: br-tun: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on br-tun, link-type EN10MB (Ethernet), capture size 65535 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@node1:/var/log/openvswitch# ovs-ofctl snoop br-int
OFPT_PACKET_IN (xid=0x0): total_len=42 in_port=6 data_len=42
buffer=0x0000044d
priority0:tunnel0:in_port0006:tci(0)
macfa:16:3e:9f:5b:2c->ff:ff:ff:ff:ff:ff type0806 proto1 tos0 ttl0
ip100.0.0.4->100.0.0.1 arp_hafa:16:3e:9f:5b:2c->00:00:00:00:00:00
fa:16:3e:9f:5b:2c > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42:
Request who-has 100.0.0.1 tell 100.0.0.4, length 28
OFPT_PACKET_OUT (xid=0x0): in_port=6 actions_len=8 actions=FLOOD data_len=42
fa:16:3e:9f:5b:2c > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42:
Request who-has 100.0.0.1 tell 100.0.0.4, length 28
I guess it is because the gateway is on another node, so ARP request should
go through br-int->br-tun->eth2[compute node side]---------------------->
[controller side]eth2->br-tun->br-int, but the ARP request seems to be
blocked between br-int and br-tun.
I don't know why the ARP request is not sent to br-tun. it seems that ARP
request is sent to normal port of the OVS because VM 100.0.0.4 can ping
other VMs(100.0.0.2) on the same OVS.
root@node1:/var/log/openvswitch# ovs-vsctl show
afaf59ee-48cc-4f5b-9a1d-4311b509a6c5
*Bridge br-int*
Controller "tcp:30.0.0.1:6633"
is_connected: true
Port "qvoe06ea8d8-d7"
tag: 1
Interface "qvoe06ea8d8-d7"
Port "qvoa96762cb-f3"
tag: 4095
Interface "qvoa96762cb-f3"
Port "qvo38f23ca0-59"
tag: 1
Interface "qvo38f23ca0-59"
Port "qvofc3fe9ed-fb"
tag: 4095
Interface "qvofc3fe9ed-fb"
Port br-int
Interface br-int
type: internal
Port patch-tun
Interface patch-tun
type: patch
options: {peer=patch-int}
Port "eth3"
Interface "eth3"
Port "qvo1021fd99-eb"
tag: 4095
Interface "qvo1021fd99-eb"
Port "qvo329db52d-81"
tag: 4095
Interface "qvo329db52d-81"
Bridge "qbre06ea8d8-d7"
Port "qbre06ea8d8-d7"
Interface "qbre06ea8d8-d7"
type: internal
Port "qvbe06ea8d8-d7"
Interface "qvbe06ea8d8-d7"
Port "tape06ea8d8-d7"
Interface "tape06ea8d8-d7"
Bridge "qbr329db52d-81"
Port "qbr329db52d-81"
Interface "qbr329db52d-81"
type: internal
Port "qvb329db52d-81"
Interface "qvb329db52d-81"
Bridge "qbrc8ec86f4-3a"
Port "qbrc8ec86f4-3a"
Interface "qbrc8ec86f4-3a"
type: internal
Port "qvbc8ec86f4-3a"
Interface "qvbc8ec86f4-3a"
*Bridge br-tun*
Port patch-int
Interface patch-int
type: patch
options: {peer=patch-tun}
Port br-tun
Interface br-tun
type: internal
Port "gre-1"
Interface "gre-1"
type: gre
options: {in_key=flow, out_key=flow, remote_ip="30.0.0.1"}
Bridge "qbr31c6e35b-81"
Port "qbr31c6e35b-81"
Interface "qbr31c6e35b-81"
type: internal
Port "qvb31c6e35b-81"
Interface "qvb31c6e35b-81"
Bridge "qbr38f23ca0-59"
Port "qbr38f23ca0-59"
Interface "qbr38f23ca0-59"
type: internal
Port "tap38f23ca0-59"
Interface "tap38f23ca0-59"
Port "qvb38f23ca0-59"
Interface "qvb38f23ca0-59"
Bridge "qbr28117358-50"
Port "qvb28117358-50"
Interface "qvb28117358-50"
Port "qbr28117358-50"
Interface "qbr28117358-50"
type: internal
Bridge "qbr1021fd99-eb"
Port "qvb1021fd99-eb"
Interface "qvb1021fd99-eb"
Port "qbr1021fd99-eb"
Interface "qbr1021fd99-eb"
type: internal
Bridge "qbr054163ed-d1"
Port "qvb054163ed-d1"
Interface "qvb054163ed-d1"
Port "qbr054163ed-d1"
Interface "qbr054163ed-d1"
type: internal
Bridge "qbr5c2a6893-3c"
Port "qvb5c2a6893-3c"
Interface "qvb5c2a6893-3c"
Port "qbr5c2a6893-3c"
Interface "qbr5c2a6893-3c"
type: internal
Bridge "qbra96762cb-f3"
Port "qvba96762cb-f3"
Interface "qvba96762cb-f3"
Port "qbra96762cb-f3"
Interface "qbra96762cb-f3"
type: internal
Bridge "qbrfc3fe9ed-fb"
Port "qvbfc3fe9ed-fb"
Interface "qvbfc3fe9ed-fb"
Port "qbrfc3fe9ed-fb"
Interface "qbrfc3fe9ed-fb"
type: internal
Bridge "br0"
Port "eth0"
Interface "eth0"
Port "br0"
Interface "br0"
type: internal
Bridge "qbr42d41f3f-e8"
Port "qbr42d41f3f-e8"
Interface "qbr42d41f3f-e8"
type: internal
Port "qvb42d41f3f-e8"
Interface "qvb42d41f3f-e8"
Bridge "qbr4881e5be-2f"
Port "qbr4881e5be-2f"
Interface "qbr4881e5be-2f"
type: internal
Port "qvb4881e5be-2f"
Interface "qvb4881e5be-2f"
ovs_version: "1.4.0+build0"
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