[CentOS] Re: Issues with SNMP

[Dhawal Doshy]

Robert Spangler wrote:
> Hello,
> 
> I'm wondering if anyone else is seeing the same issues I'm seeing here.  I 
> have recently upgraded one of my systems from 4.4 to 4.5 and ever since then 
> I cannot get snmp to work.  I am monitoring the interface traffic.  Please 
> keep in mind the firewall/router I do the same thing without any issues for 4 
> interfaces and it is still at 4.4 and doesn't have any issues.
> 
> If I try an snmpwalk I get the following;
> 
> ~~~~~~~~~~~~~~~~~~~~~~
> snmp $ snmpwalk -v 1 -c <string> localhost system
> Timeout: No Response from localhost
> 
> snmp $ snmpwalk -v 2c -c <string> localhost system
> Timeout: No Response from localhost
> ~~~~~~~~~~~~~~~~~~~~~~
> 
> snmpd is up and running according to the system
> 
> ~~~~~~~~~~~~~~~~~~~~~~
> snmp $ service snmpd status
> snmpd (pid 7884) is running...
> ~~~~~~~~~~~~~~~~~~~~~~
> 
> snmp.conf file hasn't changed since I last changed it in Jan.  I'm stumped as 
> to why it is not working and don't want to upgrade the router/firewall box, 
> which is working without any issues,  until this get fixed.  Can someone 
> point me to what I am missing or point me in the right direction?  Thnx!

see /etc/hosts.allow and /etc/hosts.deny, the 4.5 upgrade add tcpwrapper 
support to snmpd (which wasn't the case before).. see "rpm -q 
--changelog net-snmp-utils"

echo "snmpd: 127.0.0.1" >> /etc/hosts.allow