NOTE: This driver has not been ported from
4.4BSD yet.
The
ex interface provides access to a 10 Mb/s Ethernet network through an Excelan controller used as a link-layer interface.
Each of the host's network addresses is specified at boot time with an
SIOCSIFADDR ioctl(2). The
ex interface employs the address resolution protocol described in
arp(4) to dynamically map between Internet and Ethernet addresses on the local network.
The interface normally tries to use a “trailer” encapsulation to minimize copying data on input and output. The use of trailers is negotiated with ARP. This negotiation may be disabled, on a per-interface basis, by setting the
IFF_NOTRAILERS flag with an
SIOCSIFFLAGS ioctl(2).