[ 1207.147519][T11118] Could not find device with ifindex 2000 in netnsfd 11
[ 1207.148284][T11118] Could not find netns with fd: 2000
[ 1207.148875][T11118] Cannot link a netdevsim to itself
[ 1207.149498][T11118] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).