[ 1110.935581][T11125] Could not find device with ifindex 2000 in netnsfd 11
[ 1110.936699][T11125] Could not find netns with fd: 2000
[ 1110.937615][T11125] Cannot link a netdevsim to itself
[ 1110.938722][T11125] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).