[ 1085.159849][T11279] Could not find device with ifindex 2000 in netnsfd 11
[ 1085.160583][T11279] Could not find netns with fd: 2000
[ 1085.161170][T11279] Cannot link a netdevsim to itself
[ 1085.162197][T11279] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).