perfSONAR User Q&A and Other Discussion

[Andrew Lake <>]

Hi Roberto,

It sounds like you have a perfectly reasonable setup. That warning displays anytime you have both throughput and latency tests on the same host. The message is not very smart and doesn't look at things like interfaces used, etc.  You can safely ignore the warning. Running them out separate interfaces is the key otherwise you are likely to see loss artifacts in your OWAMP results as they compute for bandwidth resources on the interface. Even then, if it's your only option is not the worst thing to do, just something of which to be aware. It sounds like you have things separated and should be in good shape.

Thanks,
Andy

On Wed, Aug 29, 2018 at 10:51 AM, Roberto Carna <> wrote:

Dear, I've just configured a perfSONAR server for client usage.

I put tow interfaces in the same network segment, and I've added these
lines in /etc/sysctl.conf in order to avoid ARP conflicts with both
interfaces:

net.ipv4.conf.all.arp_ignore=1
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.default.arp_filter=1
net.ipv4.conf.all.arp_filter=1

After that I configured two tests selecting different interfaces:

1- Throughput against albq-pt1.es.net server, selecting eth0
2- One-way Latency against aofa-owamp.es.net server, selecting eth1

After saving te tests configuration, I get this warning in the
perfSONAR web interface:

This host is configured with both bandwidth and one-way latency tests.
Bandwidth tests can interfere with one-way latency tests.

What is the reason for this warning? Because I have two interfaces.

Pleae can you help me ?

Thanks a lot, regards !!!

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