In addition to the mail that follows, I am having some problem with quantum networks as well. When I create a network using : sudo nova-manage network create --label=$tenant0 --fixed_range_v4=$iprange0 --project_id=$tenant0 I can see the network using both "quantum list_nets $tenant0" and "nova-manage network list", but when I delete the network using "quantum delete_net $tenant0 $netID", the nova-manage network list still shows the network and when I try to use the same CIDR for another network,I get an error saying CIDR already in use. Shouldn't deleting "quantum list_nets" and "nova-manage network list" be consistent with each other ? From: salma...@live.com To: openstack@lists.launchpad.net Subject: Understanding Integration Bridge and MACs Date: Sun, 13 May 2012 19:42:14 -0500 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
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