Re: Two net-snmp machines - only one retrieves data from IBM AS/400

On 08/12/06, David Ingoldsby <[email protected]> wrote:
> There are two machines acting as SNMP managers:
>
> 1: RedHat Enterprise Linux: net-snmp 5.1.2 installed.
> I run snmpget to 10.0.1.48:
> [root@RHEL4~]# snmpget -v 1 10.0.1.48 -c public system.sysDescr.0
> SNMPv2-MIB::sysDescr.0 = STRING: IBM OS/400 V5R3M0

>
> 2: CentOS 4.4:  net-snmp 5.1.2 installed.
> I run snmpget to 10.0.1.48:
> snmpget -v 1 10.0.1.48 -c public system.sysDescr.0
> Timeout: No Response from 10.0.1.48.


> On rhe RHEL machine, to 10.0.1.48, there's an SNMP get-request, followed
> immediately by a get-response.
>
> On the CentOS machine, there's an  SNMP get-request, followed immediately
> by a get-response, followed immediately by an ICMP to the port the
> get-response came from.

That definitely sounds like low-level network access control.
(i.e. way below the level that Net-SNMP works at)



> Wireshark on both machines sees the responses relevant to that machine,
> and neither machine is running a firewall.

Are you sure that the CentOS machine doesn't have 'iptables' installed?
What do:

     service iptable status
     chkconfig --list iptables

return on this box?

Dave

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