Good,Also here is a new GUI build, which has the problem with TRex 2.38+ fixed: https://github.com/cisco-system-traffic-generator/trex-stateless-gui/releases/tag/v4.2.2Thanks,Anton

Hi Piotr,Got it, you want to use linux interfaces, which appeared in v2.37. This version should also be ok with GUI, as the problem appeared in v2.38.If you have issues running v2.37, simply apply the following fix: https://github.com/cisco-system-tr...

Hi Piotr,I can reproduce this issue with the GUI and latest T-Rex ( 2.38, 2.39 ).We're working on resolving it, I'll update the ticket once the fix is ready.As a workaround you could use TRex v2.36 for nowwget -O - http://trex-tgn.cisco.com/trex/rele...