How to Test for UDP Packet Loss

[AY2022]

I'm trying to capture the packet loss. 

We are having issue with DNS traffic that traverse through auto vpn via the vMX. 

Other than doing packet capture simultaneously from both end (on MX / MS), is there any other methods? 

Anyone has encountered UDP traffic issue via auto VPN?

[alemabrahao]

Have you tried with Wireshark?

[PhilipDAth]

I haven't seen any issues with UDP over AutoVPN.

I would be using a packet capture to analyse the issue first.

If it is a Windows DNS server, you could also enable DNS logging, and see if the log produces anything interesting.

[vchagas]

You may try to use iPerf. Please see the following documentation that explains more about this tool. 

https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Troubleshooting_Cl...

The results of the test will show the packet loss rate, as well as other network performance metrics such as jitter and throughput. it's important to note that UDP is an unreliable protocol, so some packet loss is to be expected.

[PhilipDAth]

Note that it is normal for iPerf to report UDP packet loss.  What you can determine with it is what rate you can sustain with an acceptable level of packet loss by doing repeated trials at different bit rates.