[ 1086.305589][T11101] Could not find device with ifindex 2000 in netnsfd 11
[ 1086.306323][T11101] Could not find netns with fd: 2000
[ 1086.306953][T11101] Cannot link a netdevsim to itself
[ 1086.307664][T11101] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).