[ 1232.701506][T11117] Could not find device with ifindex 2000 in netnsfd 11
[ 1232.702306][T11117] Could not find netns with fd: 2000
[ 1232.702924][T11117] Cannot link a netdevsim to itself
[ 1232.703618][T11117] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).