[ 1213.102737][T11125] Could not find device with ifindex 2000 in netnsfd 11
[ 1213.103501][T11125] Could not find netns with fd: 2000
[ 1213.104050][T11125] Cannot link a netdevsim to itself
[ 1213.104729][T11125] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).