[ 1093.888486][T11278] Could not find device with ifindex 2000 in netnsfd 11
[ 1093.889591][T11278] Could not find netns with fd: 2000
[ 1093.890520][T11278] Cannot link a netdevsim to itself
[ 1093.891620][T11278] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).