[ 1191.413741][T10968] Could not find device with ifindex 2000 in netnsfd 11
[ 1191.414381][T10968] Could not find netns with fd: 2000
[ 1191.414893][T10968] Cannot link a netdevsim to itself
[ 1191.415524][T10968] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).