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Re: [perfsonar-user] tips for One way latency and bw test on separate NICs on perfSonar 3.4rc2


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  • From: Zhi-Wei Lu <>
  • Cc: <>, Daniel Doyle <>
  • Subject: Re: [perfsonar-user] tips for One way latency and bw test on separate NICs on perfSonar 3.4rc2
  • Date: Sun, 28 Dec 2014 12:34:49 -0800
  • Authentication-results: spf=none (sender IP is ) ;

Hi all,

I am reviving my old thread as I am progressing more on this TWO NICs setup.

I have configured two NICs with Linux policy routing, with one NIC as a primary, currently performing regular tests with bwping, bwtraceroute, and bwctl, while the other NIC was configured for powstream (one way latency tests). I manually configured with the configure file in
/opt/perfsonar_ps/regular_testing/etc/regular_testing.conf

After each <test>, I manually and explicitly added (rather than using implied "default" interface, problematic in a multi-NICs situation)

local_interface eth0
for bwping, bwtraceroute, and bwctl

local_interface eth1
for latency tests (powstream)

I am wondering how I can modify my configuration files to advertise INCOMING powstream only on ip address corresponding to eth1 and other tests to eth0. Currently, the web GUI advertises all tests on both interfaces.

Thank you very much for your insight and have a wonderful New Year!


On 07/30/2014 12:38 PM, Trey Dockendorf wrote
That's a problem with Linux I believe. Having two interfaces on the same
subnet will result in both IPs responding but if you do an arping to each IP
you will likely see that the same MAC address is hit every time. I do not
know the right way to fix this, so I've always avoided that situation of
configuring two NICs on the same subnet.

RedHat has knowledge base articles regarding this but it's for subscribers
only. Here's something similar but not requiring a subscription,
http://z-issue.com/wp/linux-rhel-6-centos-6-two-nics-in-the-same-subnet-but-secondary-doesnt-ping/

Not sure if that's the problem your describing.

- Trey

=============================

Trey Dockendorf
Systems Analyst I
Texas A&M University
Academy for Advanced Telecommunications and Learning Technologies
Phone: (979)458-2396
Email:

Jabber:


----- Original Message -----
From: "Zhi-Wei Lu"
<>
To: "Daniel Doyle"
<>
Cc:
,
"Pulak K Chowdhury"
<>
Sent: Wednesday, July 30, 2014 1:56:23 PM
Subject: RE: [perfsonar-user] tips for One way latency and bw test on
separate NICs on perfSonar 3.4rc2

Hi Daniel,

Thanks for the tip and I have found it configuration in the web gui.

However, I am stuck again! I started the system with one configured
NIC and scheduled "owamp" test. Later, I enabled the second NIC on
the same subnet, now the "Throughtput/Latency Graphs" won't
displayed at all, a perpetual spinning circles goes around (even
after I disabled the second NIC).

If I have two NICs in the the same host on the same subnet, will the
outgoing tests use the first interface only (default route on the
default NIC)? While both interface were up, the "local services"
show all tests running on both NICs, how can I configure the
incoming tests for individual NIC. With two NICs on the same
subnet, the incoming test comes the second NIC, but the outgoing
packets could be sent out on the first NIC, is that right?

Thank you.

Zhi-Wei Lu
IET-CR-Network Operations Center
University of California, Davis
(530) 752-0155

-----Original Message-----
From: Daniel Doyle
[mailto:]
Sent: Wednesday, July 30, 2014 6:34 AM
To: Zhi-Wei Lu
Cc:
;
Pulak K Chowdhury
Subject: Re: [perfsonar-user] tips for One way latency and bw test on
separate NICs on perfSonar 3.4rc2

Zhi-Wei,

This is configurable in the same place as you configure all the rest
of the test parameters, underneath "Toolkit Administration" on the
left in the section "Configure Tests".

There is now a new field called "Interface" under the Test Parameters
section of a test that defaults to "Default" which was the old
behavior. You can change this to instruct the test to use a specific
interface instead. All previously configured tests should have
"Default" set as their Interface option when upgrading.

Hope that helps.

-Dan

On Jul 30, 2014, at 1:47 AM, Zhi-Wei Lu
<>
wrote:

Hi all,

I have successfully installed perfSonar 3.4rc2 recently and I heard
that it is now possible to configure owamp and bw tests on two
separate NICs, I would love to learn how I can configure perfSonar
to accomplish two NIC set up.

Thank you very much for your help.

--
Zhi-Wei Lu
IET-CR-Network Operations Center
University of California, Davis
(530) 752-0155
Dan Doyle
GlobalNOC Software Developer
1-812-856-3892






--
Zhi-Wei Lu
IET-CR-Network Operations Center
University of California, Davis
(530) 752-0155




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