[ 1195.964531][T10984] Could not find device with ifindex 2000 in netnsfd 11
[ 1195.965290][T10984] Could not find netns with fd: 2000
[ 1195.965844][T10984] Cannot link a netdevsim to itself
[ 1195.966704][T10984] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).