[ 1088.577747][T11271] Could not find device with ifindex 2000 in netnsfd 11
[ 1088.578421][T11271] Could not find netns with fd: 2000
[ 1088.579223][T11271] Cannot link a netdevsim to itself
[ 1088.579963][T11271] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).