[ 1097.441233][T11408] Could not find device with ifindex 2000 in netnsfd 11
[ 1097.441944][T11408] Could not find netns with fd: 2000
[ 1097.442554][T11408] Cannot link a netdevsim to itself
[ 1097.443273][T11408] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).