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[Bug 1793244] [NEW] Egress UDP traffic is dropped

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Annie Melen <1793244@xxxxxxxxxxxxxxxxxx>
Date: Wed, 19 Sep 2018 04:10:11 -0000
Reply-to: Bug 1793244 <1793244@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Hello!

I've encountered the error while becnhmarking UDP traffic between two
instances. Any help would be apreciated.

I've got two instances (test1: 172.31.200.232, test2: 172.31.200.234)
located in one external network on separate compute nodes. Testing via
iperf3 brought me to fail:

root@test1:~# iperf3 -s
root@test2:~# iperf3 -c 172.31.200.234 -u 
Connecting to host 172.31.200.234, port 5201
iperf3: error - unable to read from stream socket: Resource temporarily unavailable

While, when I put together these instances on the same compute node,
everything is fine:

root@test1:~# iperf3 -s
root@test2:~# iperf3 -c 172.31.200.234 -u 
Connecting to host 172.31.200.234, port 5201
[  4] local 172.31.200.232 port 57176 connected to 172.31.200.234 port 5201
[ ID] Interval           Transfer     Bandwidth       Total Datagrams
[  4]   0.00-1.00   sec   120 KBytes   983 Kbits/sec  15  
[  4]   1.00-2.00   sec   128 KBytes  1.05 Mbits/sec  16  
[  4]   2.00-3.00   sec   128 KBytes  1.05 Mbits/sec  16  
[  4]   3.00-3.22   sec  40.0 KBytes  1.46 Mbits/sec  5

My security groups allow UDP and TCP traffic.

Openstack Queens, openvswitch v.2.9
Firewall_driver is 'openvswitch', can it be the cause?

Thanks,
Annie

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1793244

Title:
  Egress UDP traffic is dropped

Status in neutron:
  New

Bug description:
  Hello!

  I've encountered the error while becnhmarking UDP traffic between two
  instances. Any help would be apreciated.

  I've got two instances (test1: 172.31.200.232, test2: 172.31.200.234)
  located in one external network on separate compute nodes. Testing via
  iperf3 brought me to fail:

  root@test1:~# iperf3 -s
  root@test2:~# iperf3 -c 172.31.200.234 -u 
  Connecting to host 172.31.200.234, port 5201
  iperf3: error - unable to read from stream socket: Resource temporarily unavailable

  While, when I put together these instances on the same compute node,
  everything is fine:

  root@test1:~# iperf3 -s
  root@test2:~# iperf3 -c 172.31.200.234 -u 
  Connecting to host 172.31.200.234, port 5201
  [  4] local 172.31.200.232 port 57176 connected to 172.31.200.234 port 5201
  [ ID] Interval           Transfer     Bandwidth       Total Datagrams
  [  4]   0.00-1.00   sec   120 KBytes   983 Kbits/sec  15  
  [  4]   1.00-2.00   sec   128 KBytes  1.05 Mbits/sec  16  
  [  4]   2.00-3.00   sec   128 KBytes  1.05 Mbits/sec  16  
  [  4]   3.00-3.22   sec  40.0 KBytes  1.46 Mbits/sec  5

  My security groups allow UDP and TCP traffic.

  Openstack Queens, openvswitch v.2.9
  Firewall_driver is 'openvswitch', can it be the cause?

  Thanks,
  Annie

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