SNMP error

[abefroman99]

Hi,

I installed cacti for the first time and I am getting a "SNMP error" when trying to view graphs.

What can I do to troubleshoot that?

Should this be saying Open?
# nmap -sS xx.xx.yy.yy -p161
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2009-01-21 16:43 CST
Interesting ports on xx.xx.yy.yy:
PORT STATE SERVICE
161/tcp closed snmp


TIA!

[gandalf]

Yep. Please see 1st link of my sig for setup instructions and more
Reinhard

[abefroman]

Thanks!

I was actually testing tcp, not udp, when I test udp, it say its open:
# nmap -sU xx.xx.xx.xx -p161

Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2009-01-22 19:02 CST
Interesting ports on xx.xx.xx.xx:
PORT STATE SERVICE
161/udp open|filtered snmp

Nmap run completed -- 1 IP address (1 host up) scanned in 0.335 seconds

I looked through your link, looked through the faq, tried a couple things, but it is still giving SNMP error.

Is there anyway to get more details than "SNMP error"?

I have my community string set as "public"

When it says "SNMP error" is it almost always a problem with the community string?

This is what I have in running-config on my switch
access-list 2 permit xx.xx.xx.xx
snmp-server community public RO 2
snmp-server enable traps vtp
snmp-server host xx.xx.xx.xx version 2c public

where xx.xx.xx.xx is the IP of my cacti server

Do you know what could be wrong?

Is there a way to test an SNMP read from the command line?

[gandalf]

Yep. Use

Code: Select all

snmpwalk -c <community> -v 1 <host> system

If the device does not like v1, use v2c instead. Again, see SNMP setup instructions at first link of my sig. It's all there
Reinhard