The value of iesIfLns specifies whether this interface
can be used to terminate LNS (L2TP Network Server) PPP
sessions. The value of this object can only be set to
'true' at row creation time, and is only valid when
iesIfType is 'group'.
This object is supported for backwards compatibility only;
the recommended way to create LNS group interfaces is by means
of the iesIfGroupInterfaceType object.