-.TP 15
-.B dest_address
-Specify the address of the correspondent on the other end
-of a point to point link.
-.TP 15
-.B broadcast
-(Inet only)
-Specify the address to use to represent broadcasts to the
-network.
-The default broadcast address is the address with a host part of all 1's.
-.TP 15
-.B ipdst
-(NS only)
-This is used to specify an Internet host who is willing to receive
-ip packets encapsulating NS packets bound for a remote network.
-In this case, an apparent point to point link is constructed, and
-the address specified will be taken as the NS address and network
-of the destinee.
-.PP
-.I Ifconfig
+.\" see
+.\" Xr eon 5 .
+.It Cm nsellength Ar n
+.Pf ( Tn ISO
+only)
+This specifies a trailing number of bytes for a received
+.Tn NSAP
+used for local identification, the remaining leading part of which is
+taken to be the
+.Tn NET
+(Network Entity Title).
+The default value is 1, which is conformant to US
+.Tn GOSIP .
+When an iso address is set in an ifconfig command,
+it is really the
+.Tn NSAP
+which is being specified.
+For example, in
+.Tn US GOSIP ,
+20 hex digits should be
+specified in the
+.Tn ISO NSAP
+to be assigned to the interface.
+There is some evidence that a number different 1 may be useful
+for
+.Tn AFI
+37 type addresses.
+.It Cm trailers
+Request the use of a ``trailer'' link level encapsulation when
+sending (default).
+If a network interface supports
+.Cm trailers ,
+the system will, when possible, encapsulate outgoing
+messages in a manner which minimizes the number of
+memory to memory copy operations performed by the receiver.
+On networks that support the Address Resolution Protocol (see
+.Xr arp 4 ;
+currently, only 10 Mb/s Ethernet),
+this flag indicates that the system should request that other
+systems use trailers when sending to this host.
+Similarly, trailer encapsulations will be sent to other
+hosts that have made such requests.
+Currently used by Internet protocols only.
+.It Fl trailers
+Disable the use of a ``trailer'' link level encapsulation.
+.It Cm up
+Mark an interface ``up''.
+This may be used to enable an interface after an ``ifconfig down.''
+It happens automatically when setting the first address on an interface.
+If the interface was reset when previously marked down,
+the hardware will be re-initialized.
+.El
+.Pp
+.Pp
+.Nm Ifconfig