[ 1112.673517][T11289] Could not find device with ifindex 2000 in netnsfd 11
[ 1112.674336][T11289] Could not find netns with fd: 2000
[ 1112.674979][T11289] Cannot link a netdevsim to itself
[ 1112.675772][T11289] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).