Best solution about: CactiEZ monitoring a Linux host when iptables prevents the udp161 port from causing an inability to monitor the solution

Since there is a firewall enabled when adding a Linux host, there are two ways to troubleshoot Linux hosts because of the inability to monitor Linux hosts:
This command can be executed by the monitoring host: Snmpwalk-c public-v 2c 192.168.100.244 indicates the ability to receive data information from the monitored machine

One, effective in time, but restarting the server will have to be added to the rule again
Iptables-i input-p UDP--dport 161-j ACCEPT

Two, permanent entry in Vi/etc/sysconfig/iptables add
-A input-p UDP--dport 161-m State--state new,established-j ACCEPT

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Best solution about: CactiEZ monitoring a Linux host when iptables prevents the udp161 port from causing an inability to monitor the solution