[ 1199.680164][T10983] Could not find device with ifindex 2000 in netnsfd 11
[ 1199.680885][T10983] Could not find netns with fd: 2000
[ 1199.681438][T10983] Cannot link a netdevsim to itself
[ 1199.682129][T10983] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).