[ 1095.490111][T11289] Could not find device with ifindex 2000 in netnsfd 11
[ 1095.490869][T11289] Could not find netns with fd: 2000
[ 1095.491452][T11289] Cannot link a netdevsim to itself
[ 1095.492092][T11289] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).