[ 1190.985667][T10985] Could not find device with ifindex 2000 in netnsfd 11
[ 1190.986346][T10985] Could not find netns with fd: 2000
[ 1190.986876][T10985] Cannot link a netdevsim to itself
[ 1190.987539][T10985] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).