perfSONAR User Q&A and Other Discussion

[Andrew Lake <>]

Hi,

If you only want to accept OWAMP connections (like those initiated by 
powstream) on one of the ports you can try editing /etc/owampd/owampd.conf 
and set "srcnode <ip-of-eth1>:861". Replace <ip-of-eth1> with the IP address 
of eth1. That should cause OWAMP to only listen on eth1 instead of all 
interfaces. I haven't actually tried it but in theory that should work.

Thanks,
Andy


On Dec 28, 2014, at 3:34 PM, 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
>