This document defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP based internets. In particular@ it defines objects for managing the Ethernet Wide Area Network (WAN) Interface Sublayer (WIS). The MIB module defined in this memo is an extension of the Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Interface MIB and is implemented in conjunction with it and with the Ethernet-like Interface MIB@ the 802.3 Medium Attachment Unit MIB@ the Interfaces Group MIB@ and the Inverted Stack Table MIB.