How to install and configure ARECA Net-SNMP subagent ?

[Install]
Necessary files:
1. arclib32.a ==> ARECA library file
2. areca.lo
3. areca.o
4. areca.h
5. arcsnmp.conf

Because ARECA Net-SNMP subagent is originally written in C++, but Net-SNMP is  C, 
so we should take some modifications before compilation our subagent into Net-SNMP.

Step1: Copy the necessary files to [NET-SNMP_ROOT]/agent/mibgroup/areca

Step2: Run [NET-SNMP_ROOT]./configure

Step3: Edit ¡§Makefile¡¨ in the [NET-SNMP_ROOT]/agent/
a.	Add ¡§-lstdc++¡¨ to the tail of CFLAGS option line.
b.	Add ¡§mibgroup/areca/arclib32.a¡¨ string and ¡§mibgroup/areca/areca.lo¡¨ string to the head of LMIBOBJS option line.
c.	Add ¡§mibgroup/areca/arclib32.a¡¨ string and ¡§mibgroup/areca/areca.o¡¨ string to the head of MIBOBJS option line.

Step4: Edit mib_module_includes.h in the [NET-SNMP_ROOT]/agent/mibgroup/
a.	Add the C statement of << #include ¡§mibgroup/areca/areca.h¡¨>> to the first line

Step5: Edit mib_module_inits.h in the [NET-SNMP_ROOT]/agent/mibgroup/
a.	Add the C statement of <<if(should_init(¡§areca¡¨)) init_areca() >> to the first line

Step6: [NET-SNMP_ROOT]./make

Step7: [NET-SNMP_ROOT]./make install

Step8: Copy the snmpd and snmptrapd from /usr/local/sbin to /usr/sbin

Step9: Copy the arcsnmp.conf to /usr/local/share/snmp

Step10: Restart snmpd or snmptrapd



[Configure the snmpd (option)]
Snmpd.conf is the configuration file which defines how the Net-SNMP SNMP agent operates.
1. Edit the snmpd.conf using ether ¡¥snmpconf¡¦ tool or by hand.
   a. Run snmpconf ¡Vg basic_setup
   b. Crafting a configuration by hand, if you don¡¦t need SNMP V3 this is fairly easy.
2. The rocommunity option of snmpd.conf is necessary for areca subagent.


[Reconfigure the snmpd]
Force the snmpd to reread its configuration files.
1. Send the signal SIGHUP to the snmpd process.
   a. Use ¡¥ps -ax¡¦ to get the snmpd PID number
   b. Use ¡¥kill -HUP snmpd_PID¡¦ to force snmpd to reread.