[ 1222.924014][T11115] Could not find device with ifindex 2000 in netnsfd 11
[ 1222.924768][T11115] Could not find netns with fd: 2000
[ 1222.925387][T11115] Cannot link a netdevsim to itself
[ 1222.926307][T11115] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).