[ 1197.354467][T10964] Could not find device with ifindex 2000 in netnsfd 11
[ 1197.355546][T10964] Could not find netns with fd: 2000
[ 1197.356426][T10964] Cannot link a netdevsim to itself
[ 1197.357141][T10964] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).