[ 1097.999119][T11275] Could not find device with ifindex 2000 in netnsfd 11
[ 1097.999760][T11275] Could not find netns with fd: 2000
[ 1098.000289][T11275] Cannot link a netdevsim to itself
[ 1098.001120][T11275] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).