[ 1196.743275][T10987] Could not find device with ifindex 2000 in netnsfd 11
[ 1196.743992][T10987] Could not find netns with fd: 2000
[ 1196.744546][T10987] Cannot link a netdevsim to itself
[ 1196.745215][T10987] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).