The customer is having real issues, so I don't think it's a matter of
how pings are handled compared to other traffic. There's also pretty
much zero load on any of this stuff.
You see this with Ciscos all the time, because pings are handled at
the process level rather than the interrupt level.� I would suspect
the Mikrotik of something similar, but since MT is linux-based, AFAIK
all pings are handled in the kernel at interrupt level.� But that's
just a guess, so perhaps MT is handling the pings at the process level
for some reason.
On 09/25/2014 03:25 PM, Sterling Jacobson via Af wrote:
I�ve seen that before, but not with fiber anywhere.
�
My current deployments with RB2011 don�t show this and it�s
similar to your setup.
�
�
*From:*Af [mailto:[email protected]] *On
Behalf Of *Adam Moffett via Af
*Sent:* Thursday, September 25, 2014 2:41 PM
*To:* Animal Farm
*Subject:* [AFMUG] Mikrotik-tik-tik-tik
�
So I've got several setups like this: CCR <-> SFP <-> Fiber <-> SFP
<-> RB2011
sometimes pinging the RB2011 I can see this once per second delay.�
Those pings are at an interval of .2 seconds (ping -i .02) so you can
see the delay on every 5th packet corresponds to a once per second
"tick" of some sort.� If I vary the interval, the tick still occurs
every one second.� I have multiple installations that do this, and
multiples that don't....and I cannot find any rhyme or reason to
it.� Connected to one CCR on SFP2 I have an RB2011 that has the
symptom, and then I made a virtually identical installation on SFP3
that doesn't do it.� The only thing different is the IP addresses
and the length of the fiber (3 feet on the good one, a couple
thousand feet on the bad one).�
The delay varies anywhere from a few ms to upwards of a hundred ms,
and when it's high it affects VoIP so it is a real issue.� I have a
few more combinations of things to test, but I wonder if somebody has
seen this already who can save me a ton of time.� Anybody?
P.S.:� I emailed [email protected] <mailto:[email protected]>
yesterday.� Do they eventually respond or is it a blackhole?
!DSPAM:2,542496be61881139814307!
