Compaq TRU64 AA-RNG2A-TE - Manual (Page 88)

3 Sets the if_mtu member of the ifnet data structure for this device to
the maximum transmission unit, which for Ethernet-related media is
represented by the constant ETHERMTU.
The following media-specific constants represent the maximum
transmission unit:
ETHERMTU The maximum transmission unit for
Ethernet media. The if_ether.h file
defines the ETHERMTU constant.
FDDIMTU The maximum transmission unit for
FDDI media. The if_fddi.h file
defines the FDDIMTU constant.
TRN4_RFC1042_IP_MTU The maximum transmission unit for
the 4 megabit-per-second Token Ring
media. The if_trn.h file defines the
TRN4_RFC1042_IP_MTU
constant.
TRN16_RFC1042_IP_MTU The maximum transmission unit for
the 16 megabit-per-second Token Ring
media. The if_trn.h file defines the
TRN16_RFC1042_IP_MTU
constant.
4 Sets the if_mediamtu member of the ifnet data structure for this
device to the maximum transmission unit for the media, which for
Ethernet-related media is represented by the constant ETHERMTU.
Typically, you set this member to the same constant that is used for
the if_mtu member.
5 Sets the if_type member of the ifnet data structure for this device
to the type of network interface, which is represented by the constant
IFT_ETHER
(Ethernet I or II interface).
The following describes some of the valid interface types that are
defined in the if_types.h file:
IFT_ETHER Ethernet I or II interface
IFT_FDDI FDDI interface
IFT_ISO88025 Token Ring interface
6 Sets the ac_flag member of the arpcom data structure for this device
to the value 0 (zero). This indicates that an IP address is currently
not configured for this interface.
7 Sets the sockaddr_in data structure pointer to the address of the
network interface. The address of the network interface is referenced
through the if_addr member of the ifnet data structure for this
device.
6–4 Implementing the Autoconfiguration Support Section (attach)