perfSONAR User Q&A and Other Discussion

[Michael Johnson <>]

Hi Zhi-Wei,

I'm not aware of a way to do this, but a lot of people are out this week. 
I'll double-check next week.

Thanks,
Michael

On Sun, Dec 28, 2014 at 12:34:49PM -0800, Zhi-Wei Lu wrote:
> 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

--
Michael Johnson
GlobalNOC Software Engineering
Indiana University

812-856-2771

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