[ 1240.800547][T10978] Could not find device with ifindex 2000 in netnsfd 11
[ 1240.801481][T10978] Could not find netns with fd: 2000
[ 1240.802136][T10978] Cannot link a netdevsim to itself
[ 1240.803010][T10978] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).