Vish,
We are not sure if this particular issue may cause any problem, but just
wanted to understand what is wrong.
To provide a bit more data about this particular environment:
- Dedicated servers config at RAX
- FlatDHCP mode with primary NIC (eth0) bridged and used for
fixed_range as well
- Secondary nic (eth1) used for RabbitMQ/Glance/etc
- Nova-network running on one node only
If we disable promiscuous mode, everything works fine – no DUPs. But in this
case VMs running on other nodes are unable to go outside (what is an
expected behavior in this case).
Here are some details of this config:
Nova.conf:
--s3_host=10.240.107.128
--rabbit_host=10.240.107.128
--ec2_host=10.240.107.128
--glance_api_servers=10.240.107.128:9292
--sql_connection=mysql://root:123@10.240.107.128/nova
--routing_source_ip=172.31.252.152
--fixed_range=172.31.252.0/22
--network_manager=nova.network.manager.FlatDHCPManager
--public_interface=br100
--multi_host=False
…
root@web1:/# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet 169.254.169.254/32 scope link lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen
1000
link/ether 84:2b:2b:5a:49:a0 brd ff:ff:ff:ff:ff:ff
inet6 fe80::862b:2bff:fe5a:49a0/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen
1000
link/ether 84:2b:2b:5a:49:a2 brd ff:ff:ff:ff:ff:ff
inet 10.240.107.128/24 brd 10.240.107.255 scope global eth1
inet6 fe80::862b:2bff:fe5a:49a2/64 scope link
valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 84:2b:2b:5a:49:a4 brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 84:2b:2b:5a:49:a6 brd ff:ff:ff:ff:ff:ff
6: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UNKNOWN
link/ether 02:bb:dd:bd:e6:ed brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
*8: br100: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UNKNOWN *
* link/ether 84:2b:2b:5a:49:a0 brd ff:ff:ff:ff:ff:ff*
* inet 172.31.252.152/22 brd 172.31.255.255 scope global br100*
* inet 172.31.252.1/22 brd 172.31.255.255 scope global secondary br100*
* inet6 fe80::90db:ceff:fe33:450c/64 scope link *
* valid_lft forever preferred_lft forever*
9: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UNKNOWN qlen 500
link/ether fe:16:3e:0e:11:6e brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc16:3eff:fe0e:116e/64 scope link
valid_lft forever preferred_lft forever
root@web1:/# brctl show
bridge name bridge id STP enabled interfaces
br100 8000.842b2b5a49a0 no eth0
vnet0
virbr0 8000.000000000000 yes
root@web1:/# ifconfig -a
br100 Link encap:Ethernet HWaddr 84:2b:2b:5a:49:a0
inet addr:172.31.252.152 Bcast:172.31.255.255 Mask:255.255.252.0
inet6 addr: fe80::90db:ceff:fe33:450c/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:6909 errors:0 dropped:621 overruns:0 frame:0
TX packets:2634 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:533738 (533.7 KB) TX bytes:419886 (419.8 KB)
eth0 Link encap:Ethernet HWaddr 84:2b:2b:5a:49:a0
inet6 addr: fe80::862b:2bff:fe5a:49a0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6705 errors:0 dropped:0 overruns:0 frame:0
TX packets:2667 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:598182 (598.1 KB) TX bytes:447933 (447.9 KB)
Interrupt:36 Memory:d6000000-d6012800
eth1 Link encap:Ethernet HWaddr 84:2b:2b:5a:49:a2
inet addr:10.240.107.128 Bcast:10.240.107.255 Mask:255.255.255.0
inet6 addr: fe80::862b:2bff:fe5a:49a2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:557 errors:0 dropped:0 overruns:0 frame:0
TX packets:491 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:214973 (214.9 KB) TX bytes:267663 (267.6 KB)
Interrupt:48 Memory:d8000000-d8012800
eth2 Link encap:Ethernet HWaddr 84:2b:2b:5a:49:a4
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:32 Memory:da000000-da012800
eth3 Link encap:Ethernet HWaddr 84:2b:2b:5a:49:a6
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:42 Memory:dc000000-dc012800
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:62789 errors:0 dropped:0 overruns:0 frame:0
TX packets:62789 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:46351343 (46.3 MB) TX bytes:46351343 (46.3 MB)
virbr0 Link encap:Ethernet HWaddr 02:bb:dd:bd:e6:ed
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
vnet0 Link encap:Ethernet HWaddr fe:16:3e:0e:11:6e
inet6 addr: fe80::fc16:3eff:fe0e:116e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:646 errors:0 dropped:0 overruns:0 frame:0
TX packets:3970 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:119572 (119.5 KB) TX bytes:317664 (317.6 KB)
Thanks,
-Vladimir
*From:* openstack-bounces+vladimir=zadarastorage....@lists.launchpad.net[mailto:
openstack-bounces+vladimir=zadarastorage....@lists.launchpad.net] *On Behalf
Of *Vishvananda Ishaya
*Sent:* Friday, October 14, 2011 9:02 AM
*To:* Shyam Kaushik
*Cc:* openstack@lists.launchpad.net
*Subject:* Re: [Openstack] Duplicate ICMP due to public interface bridge
being placed in promiscus mode
Strange, I haven't seen this. It sounds like maybe you have a mac address
conflict somehow. The only time I've seen duplicate icmp responses is when
I was running inside of virtualbox and due to the way vagrant was setting up
vms, I had multiple vms with same mac.
Vish
On Oct 14, 2011, at 5:59 AM, Shyam Kaushik wrote:
*Hi Vish,*
In our openstack deployment we observe this:
Since linux_net.py/initialize_gateway_device() does this
# NOTE(vish): If the public interface is the same as the
# bridge, then the bridge has to be in promiscuous
# to forward packets properly.
if(FLAGS.public_interface == dev):
_execute('ip', 'link', 'set',
'dev', dev, 'promisc', 'on', run_as_root=True)
Any VM spawned on the cloud controller node if it sends an ICMP ping to an
external network gets duplicate replies (i.e. there are 2 replies for the
same ICMP request). For VM’s spawned on any other non-cloud controller this
doesn’t happen.
If we turn of promiscus mode on the bridge, the VM on cloud controller
doesn’t see the duplicate replies, but VM’s on non-cloud controller cannot
reach external network.
Question to you is, is this duplicate ICMP replies expected for VM’s running
on cloud controller due to above logic?
--Shyam
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