[ 1242.249520][T10979] Could not find device with ifindex 2000 in netnsfd 11
[ 1242.250286][T10979] Could not find netns with fd: 2000
[ 1242.250876][T10979] Cannot link a netdevsim to itself
[ 1242.251616][T10979] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).