Ports need to open on remote Linux/AIX hosts from Cacti server

[soumendra]

Hi,

Can anyone tell me what are all the SNMP ports that need to open from Cacti server to remote Linux/AIX hosts in the firewall?
Do we need top open 161/tcp, 162/tcp or we need to open only UDP ports like 161/udp and 162/udp in firewall to fix snmp connection error.

Thanks,
Soumendra

[Achea9]

Hi,

In my Opinion, you must usually have the standard TCP/UDP Ports open for your Switches or Rouiters. And what you have to do for your cacti is, to tell the Devices to accept SNMP Request from your cacti for example using Access-Lists to permit cacti's IP address. I hope it helps.

Regards

[macan]

For cacti monitoring you need only UDP/161. Communication looks like this:
UDP IP_cacti:(any port > 1024 < 65535) --> IP_monitored device:161

Port UDP/162 is snmp trap. It isn't necessary for cacti. Device can send traps to defined destination
UDP IP_monitored_device:(any port > 1024 < 65535) --> destination:162
Cacti can work with traps, but you need plugin syslog and few other tools (convert trap to syslog message).