Not tried this but what about using a switch to combine the traffic and
send out via a SPAN port to a single capture interface?
https://blog.packet-foo.com/2016/12/the-network-capture-playbook-part-5-network-tap-basics/
"The Packet out of order problem
If you want to avoid out of order captures us
I have two network nodes built with microcontrollers. These are not
capable to capture network traffic. So I want to monitor the
communication between these nodes with a tap
(https://www.amazon.com/gp/product/B07VZYPYV8). It works as described
here: https://blog.wains.be/2007/2007-02-01-diy-passiv
