about rouser internal ?

hi, 
	using net-snmp-5.3.0.1
	configuration in snmpd.conf:
		rouser	nssro	
		createUser	nssro	MD5	authpass

with that configuration, i can snmpwalk the snmpVacmMIB and snmpUsmMIB using the SNMPv3 user nssro, as the following:
	snmpwalk -v 3 -u nssro -l authNoPriv -a MD5 -A authpass localhost snmpUsmMIB

and i get to know  how the snmpd operated(creating some conceptual rows) the tables defined in snmpUsmMIB and snmpVacmMIB,
so i want to obtain the same result using the view/group/access directives as the following:

	rwcommunity	nssrw
	createUser      nssro   MD5     authpass
	view   myiso   included        .1
	group  mygrp   usm     private
	access mygrp   ""      usm     auth    prefix  myiso   myiso   myiso

i can snmpwak the snmpUsmMIB and snmpVacmMIB using the following command:
	snmpwalk -v 2c -c nssrw localhost snmpUsmMIB

but i can get the same result when i used the following command:

[root@localhost sbin]# snmpwalk -v 3 -u nssro -l authNoPriv -a MD5 -A authpass localhost snmpUsmMIB 
Error in packet.
Reason: authorizationError (access denied to that object)	

and other questions:
	com2sec	is necessary for SNMPv3 VACM configuration? 

	why use COMMUNITY in the com2sec directive? it means that:
		for	security model v1/v2c,	community string;
		and
		for security model usm, SNMPv3 user
	right ?		

i am sorry asking for so many questions and thanks in advance.
 				
--------------
Leo Lei
2006-09-21



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