Hi Salman, I'm not familiar with the Ryu plugin, so hopefully you can get in contact with the developers to get this question answered.
Dan On Sun, May 13, 2012 at 5:42 PM, Salman Malik <[email protected]> wrote: > Hi Dan and Others, > > I am trying to understand the actions taken by Ryu when the new instance > sends DHCP discover message to dnsmasq. When I launch new instannce it > keeps on sending discover messages and controller keeps on dropping these > messages. But looking at the traffic I couldn't exactly map which MAC > address belonged to which entity. Can someone help me with my understanding > of the MAC addresses. Using ifconfig , "ovs-ofctl show br-int" and > "ovs-ofctl snoop br-int" (output shown after MAC addresses), I know exactly > about some MAC addresses and can't figure out some of them: > > Interfaces | HWAddress | IP-addr > > --------------------------------------------------------------------------------------------- > eth0 | 08:00:27:7a:ff:65 | 10.0.3.15 > eth1 | 08:00:27:16:d5:09 | > 10.0.0.10 <========plugged into br-int > gw-82bd3a73-dc | fa:16:3e:49:57:1b | 10.0.0.1 > <========plugged into br-int (this is the --listen-address of my two > dnsmasqs) > br-int | 08:00:27:16:d5:09 | > <========why doesn't bridge have no IP ? > new-instance | *02:d8:47:48:35:26* <====== MAC address > of newly launched instance? (see output below) > > *Unkown* | *fa:16:3e:5e:02:17 *<======Seemingly > unknown MAC address(which is related to the new instance?) > Unkown | *33:33:00:00:00:16** *<====== MAC > address related to multicast ? > > > Questions: > > 1. What is gw-82bd3a73-dc interface ? > 2. I am kind of unsure why br-int is so useful? > 3. Why doesn't br-int don't have any IP address? > 4. Why do we need to plugin a compute node's interface to br-int? (so that > guest instances on remote host can communicate with each other?) > 5. What is the relationship b/w *02:d8:47:48:35:26 and **fa:16:3e:5e:02:17 > *MAC addresses in the following output? > > ===================== > Output of : ovs-ofctl snoop br-int > ===================== > OFPT_ECHO_REQUEST (xid=0x0): 0 bytes of payload > OFPT_ECHO_REPLY (xid=0x0): 0 bytes of payload > OFPT_PORT_STATUS (xid=0x0): ADD: 7(tap76127847-b1): addr:* > 02:d8:47:48:35:26* > config: 0 > state: LINK_DOWN > current: 10MB-FD COPPER > OFPT_FLOW_MOD (xid=0x491662da): DEL priority=0 buf:0x0 actions=drop > OFPT_BARRIER_REQUEST (xid=0x491662db): > OFPT_BARRIER_REPLY (xid=0x491662db): > OFPT_PORT_STATUS (xid=0x0): MOD: 7(tap76127847-b1): addr:* > 02:d8:47:48:35:26* > config: 0 > state: 0 > current: 10MB-FD COPPER > OFPT_ECHO_REQUEST (xid=0x0): 0 bytes of payload > OFPT_ECHO_REPLY (xid=0x0): 0 bytes of payload > OFPT_PACKET_IN (xid=0x0): total_len=90 in_port=7 data_len=90 > buffer=0x00000167 > tunnel0:in_port0007:tci(0) macfa:16:3e:5e:02:17->33:33:00:00:00:16 > type86dd proto58 tos0 ipv6::->ff02::16 port143->0 > *fa:16:3e:5e:02:17 *> *33:33:00:00:00:16*, ethertype IPv6 (0x86dd), > length 90: :: > ff02::16: HBH ICMP6, multicast listener report v2, 1 group > record(s), length 28 > OFPT_PACKET_OUT (xid=0x491662dc): in_port=7 actions_len=0 actions=drop > buffer=0x00000167 > OFPT_PACKET_IN (xid=0x0): total_len=322 in_port=7 data_len=128 > buffer=0x00000168 > tunnel0:in_port0007:tci(0) macfa:16:3e:5e:02:17->ff:ff:ff:ff:ff:ff > type0800 proto17 tos0 ip0.0.0.0->255.255.255.255 port68->67 > *fa:16:3e:5e:02:17* > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length > 128: truncated-ip - 194 bytes missing! 0.0.0.0.68 > 255.255.255.255.67: > BOOTP/DHCP, Request from fa:16:3e:5e:02:17, length 280 > OFPT_PACKET_OUT (xid=0x491662dd): in_port=7 actions_len=0 > actions=*drop*buffer=0x00000168 > OFPT_PACKET_IN (xid=0x0): total_len=78 in_port=7 data_len=78 > buffer=0x00000169 > *fa:16:3e:5e:02:17* > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length > 128: truncated-ip - 194 bytes missing! 0.0.0.0.68 > 255.255.255.255.67: > BOOTP/DHCP, Request from fa:16:3e:5e:02:17, length 280 > OFPT_PACKET_OUT (xid=0x491662e3): in_port=7 actions_len=0 actions=drop > buffer=0x0000016e > OFPT_PACKET_IN (xid=0x0): total_len=70 in_port=7 data_len=70 > buffer=0x0000016f > tunnel0:in_port0007:tci(0) macfa:16:3e:5e:02:17->33:33:00:00:00:02 > type86dd proto58 tos0 ipv6fe80::f816:3eff:fe5e:217->ff02::2 port133->0 > fa:16:3e:5e:02:17 > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: > fe80::f816:3eff:fe5e:217 > ff02::2: ICMP6, router solicitation, length 16 > OFPT_PORT_STATUS (xid=0x0): MOD: 7(tap76127847-b1): addr:* > 02:d8:47:48:35:26* > config: 0 > state: LINK_DOWN > current: 10MB-FD COPPER > OFPT_PORT_STATUS (xid=0x0): DEL: 7(tap76127847-b1): addr:* > 02:d8:47:48:35:26* > config: 0 > state: LINK_DOWN > current: 10MB-FD COPPER > OFPT_FLOW_MOD (xid=0x491662e5): DEL priority=0,in_port=7 actions=drop > OFPT_FLOW_MOD (xid=0x491662e6): DEL priority=0 actions=drop > OFPT_BARRIER_REQUEST (xid=0x491662e7): > OFPT_BARRIER_REPLY (xid=0x491662e7): > > Thanks! > Salman > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > > -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dan Wendlandt Nicira, Inc: www.nicira.com twitter: danwendlandt ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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