The answer turns out to be - don't use snmpquery, use snmplookup.
209 nisc.upenn.edu> snmplookup
snmplookup Version 3.2
Copyright (C) PSI, Inc. 1990
default community name is monitor
default timeout is 10 seconds
default number of recv retries is 1
default prefix is _iso_org_dod_internet
snmp> agent default-gw
snmp> mquery _mgmt_mib_ip_ipNetToMediaTable_
Snmplookup "mquery" employs the "powerfull" get-next operator.
T.T.F.N
William H. Magill Manager, PennNet Computing Services
Data Communications and Computing Services (DCCS) University of Pennsylvania
Internet: mag...@dccs.upenn.edu mag...@eniac.seas.upenn.edu
mag...@upenn.edu