[ 1229.705931][T11131] Could not find device with ifindex 2000 in netnsfd 11
[ 1229.706747][T11131] Could not find netns with fd: 2000
[ 1229.707378][T11131] Cannot link a netdevsim to itself
[ 1229.708345][T11131] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).