Cacti Satellite link Timeout while doing SNMP

[charlesrg]

We have a Cacti working fine for our LAN, but for remote routers over Satellite cacti can't get the Interface Statiscs SNMP walk. The delay is around 500ms Round-Trip

It tries to do it, but dies, and doesn't populate the database with the SNMP Interfaces Information.
To do a snmpwalk in a Cisco 5400 remotely over satellite can take a few minutes.
What can I do to fix that problem ?
Increasing the PHP running timeout will not be enough, the browser doesn't wait forever for an answer. Disabling PHP Buffering will help ? Or there is other way that will be better ?

I'm using the lastest version with the lastest patches.

[rony]

.5 second response time on a packet is, well, not good, as you probably know. I don't think you are going to have much luck.

Sorry,

[charlesrg]

It's .5 seconds round trip, and it's normal with any satellite link. It's a normal delay. The problem isn't the SNMP, but the big query that cacti have to do populate the interfaces database.

[rony]

You are probably running into the php servers timeout. I don't recall, but I don't think cacti attempts to set it before it runs a data query against a host. The only suggestion I have is set the timeout in the php configuration.

[rony]

Ok, I had a senior moment..... Forgot about snmp timeout.

You can and should increase the SNMP timeout on the hosts that are being queried over the Satelite. Something like 2000 ms would be enough. And in 0.8.6c, that is configurable per host.

[TheWitness]

In addition to the snmp, you should also increase the php timeout anyway.

TheWitness

[Mees]

In addition to the snmp, you should also increase the php timeout anyway.

TheWitness

Meaning the
default_socket_timeout = 180
in php.ini ?

mEES

[TheWitness]

max_execution_time

TheWitness

[Mees]

max_execution_time

TheWitness

Thanks, I just witnessed the traffic stats of my sub-sahara router (C2600) via satellite!
Polling the 5 interfaces took a good 2 minutes, so I did adjust the max_execution_time to 180 sec.

The voice router behind it with 107 interfaces did not give any result though..
Would it help to use cactid here instead of the php-poller? Using interface query in GetIF, the 107 interfaces are listes in less than 80 seconds..
Also, is it possible to set a max number of interfaces in the query. Typically, the eth interfaces are the ones to plot, and they always list up among the first 20.

cheers,
Mees

[TheWitness]

1) Change to Cactid
2) If the devices are SNMPv2, then you will like Cacti 0.8.6h which will query with the bulkwalk command.

TheWitness