[ 1114.752671][T11117] Could not find device with ifindex 2000 in netnsfd 11
[ 1114.753608][T11117] Could not find netns with fd: 2000
[ 1114.754744][T11117] Cannot link a netdevsim to itself
[ 1114.755424][T11117] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).