[ 1202.889446][T11096] Could not find device with ifindex 2000 in netnsfd 11
[ 1202.890168][T11096] Could not find netns with fd: 2000
[ 1202.890989][T11096] Cannot link a netdevsim to itself
[ 1202.891650][T11096] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).