(str) Set to the list of clonable network interfaces to cre-
ate on this host. Further cloning arguments may be passed to
the ifconfig(8) create command for each interface by setting
the create_args_<interface> variable. If an interface name
is specified with ``:sticky'' keyword, the interface will not
be destroyed even when rc.d/netif script is invoked with
``stop'' argument. This is useful when reconfiguring the
interface without destroying it. Entries in
cloned_interfaces are automatically appended to
network_interfaces for configuration.
Questions not answered:
- What it actually does? Repeats packets? Creates some kind of dummy device?
- When I (don't) need it?
- Security implications?
- Performance implications?
if_bridge uses it but it's not referenced.
Please post a question to a public mailling list such as freebsd-questions, not to submit it as a problem report.
It's not a mailing list question. Manual or handbook has to give an explanation of the parameter. Otherwise it's a undocumented feature. Common networking such as bridge and epair uses it, which are core components so it has to be explained properly through documentation. Not random people at mailing list.