EF(4) BSD Kernel Interfaces Manual EF(4)
ef -- pseudo-device driver providing support for multiple Ethernet frame
The ef pseudo-device driver clones each Ethernet type device with four
additional interfaces. Each of them is capable to send or receive only
one predefined frame type.
Names for the new interfaces are created by adding a fN suffix to an
existing device name. Where N is a device unit which can have one of the
0 interface with an Ethernet_II frame
1 interface with a Novell Ethernet_802.3 frame
2 interface with an Ethernet_802.2 frame
3 interface with an Ethernet_802.2/SNAP frame support.
For example, device ed0 will be populated with four devices: ed0f0,
ed0f1, ed0f2 and ed0f3.
After that, each device can be configured as usual:
# ifconfig ed0f1 ipx 0x105
This will configure IPX protocol with network number 0x105 and
Ethernet_802.3 frame type.
Please note that it is impossible to configure the IPX protocol on the
parent ed0 device after the if_ef.ko driver has been loaded.
If the parent interface is not configured for any other protocol (IP for
example), subinterfaces will not function. To avoid that, the parent
interface should be manually marked as ``up'':
# ifconfig ed0 up
The ef driver can be loaded via the loader.conf(5) file:
In this case, ordinary interface configuration commands can be used in
the rc.conf(5) file:
network_interfaces="ed2 lo0 tun0 ed2f0 ed2f1"
Avoid to configure the parent Ethernet device for the IPX protocol, after
the ef driver is loaded.
Boris Popov <bpATFreeBSD.org>.
BSD June 20, 1999 BSD