tools for latency issues?
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05-07-2020 11:03 AM
what tools are best recommended that can help idenitify slow routers or fiewalls with intermittent latency issues?
We are having jitter intermittently on voip calls possibly because of a lag in some hops
In a single trace (for example in windows) to a destiny it is sometimes hard to see which hop is causing the issues.
Pingplotter is helpful but not free.
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05-07-2020 01:50 PM
That, or any other synthetic test, though, won't really show the same results as might be happening to transit traffic on those devices.
Do you have QoS end-to-end (which is often a requirement for VoIP)?
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05-07-2020 09:15 PM
Thanks, I think you brought up a good point. We have QOS enabled on all internal network devices. Our ISP however does not have it enabled. It worked fine that way for a long time.
When I run pingplotter our firewall (sonicwall) and the ISP router show fused as one hop.That hop shows high intermittent latency spikes (2000ms) but I have hard time find out which one is the culplrit.
i will have to find out how sla can be used to monitor jitter but don't know if it's worth investing my time for this.

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05-07-2020 11:58 PM
Hello,
on a side note, I assume the SonicWall is the last hop under your control ? What QoS settings do you have configured on the SonicWall ? Does the firewall preserve the DSCP and/or 802.1p markings ?
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05-08-2020 07:03 AM - edited 05-08-2020 07:57 AM
yes, the sonicwall is the last hop on our internet network however i don't manage it nor do I have access to it. I was told QOS was configured (trust dscp).
Would ip sla udp jitter be a good way to find out where the congestion occurs exactly? Would it be helpful if i configure it on the L3 switch on the internal network? If so how do I best do this?
Thanks.
