[ 1193.843287][T10980] Could not find device with ifindex 2000 in netnsfd 11
[ 1193.843979][T10980] Could not find netns with fd: 2000
[ 1193.844507][T10980] Cannot link a netdevsim to itself
[ 1193.845507][T10980] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).