The type of the PPP multiprotocol interface. A new dialup interface is created when this field is set to the value isdn-dialup(1), isdn-dialin-only(3) or multiuser(5). A leased line interface cannot be created by setting this field to leased(2), but is automatically established if there is a corresponding leased line configuration (for example in the IsdnChTable, x21IfTable, serialIfTable). Setting this object to isdn-dialin-only(3) only incoming connections will be accepted, outgoing connection attempts are blocked. Setting this object to multiuser(5), up to biboPPPMaxConn matching incoming connections (see biboPPPAuthentication, biboPPPAuthSecret, biboPPPAuthIdent) from different dialin partners will be accepted. In all cases, a new entry in the biboPPPTable creates corresponding entries in the ifTable (a new interface) and in the biboPPPStatTable (PPP statistics).