[ 1098.062767][T11116] Could not find device with ifindex 2000 in netnsfd 11
[ 1098.063828][T11116] Could not find netns with fd: 2000
[ 1098.064699][T11116] Cannot link a netdevsim to itself
[ 1098.065811][T11116] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).