[ 1242.726368][T11110] Could not find device with ifindex 2000 in netnsfd 11
[ 1242.727197][T11110] Could not find netns with fd: 2000
[ 1242.727776][T11110] Cannot link a netdevsim to itself
[ 1242.728426][T11110] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).