3Com VCX V7122 SIP VoIP Gateway User Manual 181To change the only read-write community string from v2admin to v2mgr, follow these steps:1 Follow the procedure above to add a read-write community string to a row for v2mgr.2 Set up the EM so that subsequent ‘set’ requests use the new community string, v2mgr.3 If v2admin is being used as the trap community string, follow the procedure to changethe trap community string (see below).4 Follow the procedure above to delete a read-write community name in the row forv2admin.To change the trap community string, follow these steps:(The following procedure assumes that a row already exists in the srCommunityTable for thenew trap community string. The trap community string can be part of the TrapGroup,ReadGroup or ReadWriteGroup. If the trap community string is used solely for sending traps(recommended), it should be made part of the TrapGroup).1 Add a row to the vacmSecurityToGroupTable with these values: SecurityModel=2,SecurityName=the new trap community string, GroupName=TrapGroup, ReadGroup orReadWriteGroup. The SecurityModel and SecurityName objects are row indices.2 Modify the SecurityName field in the sole row of the snmpTargetParamsTable.Trusted ManagersBy default, the agent accepts ‘get’ and ‘set’ requests from any IP address, as long as thecorrect community string is used in the request. Security can be enhanced via the use ofTrusted Managers. A Trusted Manager is an IP address from which the SNMP Agentaccepts and processes ‘get’ and ‘set’ requests. An EM can be used to configure up to 5Trusted Managers.Configuration of Trusted Managers via ini FileTo set the Trusted Mangers table from start-up, write the following in the ini file:SNMPTRUSTEDMGR_X = D.D.D.Dwhere X is any integer between 0 and 4 (0 sets the first table entry, 1 sets the second, andso on), and D is an integer between 0 and 255.Configuration of Trusted Managers via SNMPTo configure Trusted Managers, the EM must use the srCommunityMIB, the snmpTargetMIBand the TGT-ADDRESS-MASK-MIB.You must add GroupName and RowStatus on the same set.If Trusted Managers are defined, all community strings work from all TrustedManagers. That is, there is no way to associate a community string with particulartrusted managers.
