SNMP Access on Ubuntu

Posted by javano on Server Fault See other posts from Server Fault or by javano
Published on 2011-11-22T14:26:22Z Indexed on 2011/11/23 9:54 UTC
Read the original article Hit count: 302

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ubuntu

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iptables

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snmp

I am trying to use SNMP to monitor a machine locally on its self and remotely. This is the snmpd.conf (Ubuntu 8.04.1):

#       sec.name  source          comunity
com2sec readonly  1.2.3.4    nicenandtight
com2sec readonly  5.6.7.8   reallysafe

group MyROGroup v1         readonly
group MyROGroup v2c        readonly
group MyROGroup usm        readonly

view all    included  .1                               
view system included  .iso.org.dod.internet.mgmt.mib-2.system

access MyROGroup ""      any       noauth    exact  all    none   none

syslocation my house
syscontact me <[email protected]>

exec .1.3.6.1.4.1.2021.7890.1 distro /usr/bin/distro
smuxpeer .1.3.6.1.4.1.674.10892.1

includeAllDisks 95%

1.2.3.4 is the local machines IP and everything is working locally. 5.6.7.8 is the remote machine and initially I am just trying to touch SNMPD with snmpwalk from the remote machine;

snmpwalk -v 2c -c reallysafe 1.2.3.4
Timeout: No Response from 1.2.3.4

I have added to iptables as the very first rule;

-A INPUT -p udp -m udp --dport 161 -j ACCEPT

With such a loose iptables rule I can't see why I can't even touch the SNMPD on that Uubuntu Machine. There are more specific rules further down the table but as I couldn't connect I added the above. TCPDump shows the UDP packets coming in. What could be going wrong here?

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