[ 1218.067009][T11113] Could not find device with ifindex 2000 in netnsfd 11
[ 1218.067861][T11113] Could not find netns with fd: 2000
[ 1218.068513][T11113] Cannot link a netdevsim to itself
[ 1218.069203][T11113] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).