[ 1084.600735][T11099] Could not find device with ifindex 2000 in netnsfd 11
[ 1084.601884][T11099] Could not find netns with fd: 2000
[ 1084.602873][T11099] Cannot link a netdevsim to itself
[ 1084.604030][T11099] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).