Disable "Downed Host Detection" for one host?

[Jtb]

Hi,

I need to disable the "Downed Host Detection" for one host.. It is my internet router and it seems that I don't have enough rights to do the snmp-Check..

[TheWitness]

Clear the SNMP Community string for the host and it will be disabled from a SNMP perspective. Your availability method should be SNMP Ping only however.

TheWitness

[Jtb]

Clear the SNMP Community string for the host and it will be disabled from a SNMP perspective. Your availability method should be SNMP Ping only however.

but I want monitoring over SNMP (Traffic)..

[TheWitness]

If you don't have enough permission to poll the host with SNMP, then you won't be able to get to any other counters then. So clearing the SNMP community string for that host should have not affect.

Or are you performing ICMP pings?

TheWitness

[Jtb]

It seems that my communitystring has only permissions on the network-interface and nowhere else..

[TheWitness]

Are you sure. Use Getif and perform a walk of the tree and let me know the results. The OID that is being polled is the "SysDesc" which would normally not be locked down.

TheWitness

[Jtb]

With this script:

Code: Select all

<?php 
$walk = snmpwalkoid("my IP....", "my community", ""); 

for (reset($walk ); $i = key($walk ); next($walk )) {
echo "$i: $walk[$i]<br />\n";
}
?>

everything I get is:

interfaces.ifTable.ifEntry.ifIndex.1: 1
interfaces.ifTable.ifEntry.ifIndex.2: 2
interfaces.ifTable.ifEntry.ifIndex.3: 3
interfaces.ifTable.ifEntry.ifDescr.1: Ethernet0
interfaces.ifTable.ifEntry.ifDescr.2: Serial0
interfaces.ifTable.ifEntry.ifDescr.3: Null0
interfaces.ifTable.ifEntry.ifType.1: ethernetCsmacd(6)
interfaces.ifTable.ifEntry.ifType.2: propPointToPointSerial(22)
interfaces.ifTable.ifEntry.ifType.3: other(1)
interfaces.ifTable.ifEntry.ifMtu.1: 1500
interfaces.ifTable.ifEntry.ifMtu.2: 1500
interfaces.ifTable.ifEntry.ifMtu.3: 1500
interfaces.ifTable.ifEntry.ifSpeed.1: Gauge32: 10000000
interfaces.ifTable.ifEntry.ifSpeed.2: Gauge32: 2048000
interfaces.ifTable.ifEntry.ifSpeed.3: Gauge32: 4294967295
interfaces.ifTable.ifEntry.ifPhysAddress.1: 0:7:e:e5:4b:11
interfaces.ifTable.ifEntry.ifPhysAddress.2:
interfaces.ifTable.ifEntry.ifPhysAddress.3:
interfaces.ifTable.ifEntry.ifAdminStatus.1: up(1)
interfaces.ifTable.ifEntry.ifAdminStatus.2: up(1)
interfaces.ifTable.ifEntry.ifAdminStatus.3: up(1)
interfaces.ifTable.ifEntry.ifOperStatus.1: up(1)
interfaces.ifTable.ifEntry.ifOperStatus.2: up(1)
interfaces.ifTable.ifEntry.ifOperStatus.3: up(1)
interfaces.ifTable.ifEntry.ifLastChange.1: Timeticks: (1630) 0:00:16.30
interfaces.ifTable.ifEntry.ifLastChange.2: Timeticks: (3418715118) 395 days, 16:25:51.18
interfaces.ifTable.ifEntry.ifLastChange.3: Timeticks: (0) 0:00:00.00
interfaces.ifTable.ifEntry.ifInOctets.1: Counter32: 39316313
interfaces.ifTable.ifEntry.ifInOctets.2: Counter32: 830520587
interfaces.ifTable.ifEntry.ifInOctets.3: Counter32: 0
interfaces.ifTable.ifEntry.ifInUcastPkts.1: Counter32: 196869775
interfaces.ifTable.ifEntry.ifInUcastPkts.2: Counter32: 231842103
interfaces.ifTable.ifEntry.ifInUcastPkts.3: Counter32: 0
interfaces.ifTable.ifEntry.ifInNUcastPkts.1: Counter32: 36494
interfaces.ifTable.ifEntry.ifInNUcastPkts.2: Counter32: 1207000
interfaces.ifTable.ifEntry.ifInNUcastPkts.3: Counter32: 0
interfaces.ifTable.ifEntry.ifInDiscards.1: Counter32: 82
interfaces.ifTable.ifEntry.ifInDiscards.2: Counter32: 99
interfaces.ifTable.ifEntry.ifInDiscards.3: Counter32: 0
interfaces.ifTable.ifEntry.ifInErrors.1: Counter32: 1637
interfaces.ifTable.ifEntry.ifInErrors.2: Counter32: 3578058
interfaces.ifTable.ifEntry.ifInErrors.3: Counter32: 0
interfaces.ifTable.ifEntry.ifInUnknownProtos.1: Counter32: 111
interfaces.ifTable.ifEntry.ifInUnknownProtos.2: Counter32: 48
interfaces.ifTable.ifEntry.ifInUnknownProtos.3: Counter32: 0
interfaces.ifTable.ifEntry.ifOutOctets.1: Counter32: 2440076002
interfaces.ifTable.ifEntry.ifOutOctets.2: Counter32: 2537582150
interfaces.ifTable.ifEntry.ifOutOctets.3: Counter32: 0
interfaces.ifTable.ifEntry.ifOutUcastPkts.1: Counter32: 218036976
interfaces.ifTable.ifEntry.ifOutUcastPkts.2: Counter32: 198012999
interfaces.ifTable.ifEntry.ifOutUcastPkts.3: Counter32: 0
interfaces.ifTable.ifEntry.ifOutNUcastPkts.1: Counter32: 10578325
interfaces.ifTable.ifEntry.ifOutNUcastPkts.2: Counter32: 607904
interfaces.ifTable.ifEntry.ifOutNUcastPkts.3: Counter32: 0
interfaces.ifTable.ifEntry.ifOutDiscards.1: Counter32: 60
interfaces.ifTable.ifEntry.ifOutDiscards.2: Counter32: 66195
interfaces.ifTable.ifEntry.ifOutDiscards.3: Counter32: 0
interfaces.ifTable.ifEntry.ifOutErrors.1: Counter32: 15
interfaces.ifTable.ifEntry.ifOutErrors.2: Counter32: 0
interfaces.ifTable.ifEntry.ifOutErrors.3: Counter32: 0
interfaces.ifTable.ifEntry.ifOutQLen.1: Gauge32: 0
interfaces.ifTable.ifEntry.ifOutQLen.2: Gauge32: 0
interfaces.ifTable.ifEntry.ifOutQLen.3: Gauge32: 0
interfaces.ifTable.ifEntry.ifSpecific.1: OID: .ccitt.zeroDotZero
interfaces.ifTable.ifEntry.ifSpecific.2: OID: .ccitt.zeroDotZero
interfaces.ifTable.ifEntry.ifSpecific.3: OID: .ccitt.zeroDotZero

[TheWitness]

Jens,

What type of device is this that the "SysDesc" is not supported?

TheWitness

[Jtb]

Jens,

What type of device is this that the "SysDesc" is not supported?

Cisco 1601 R

[TheWitness]

Jens,

A Cisco 1601 should respond to a request for SysDesc OID. Can you do an SNMP get for that OID and post the response.

Thanks,

TheWitness

[bulek]

Jens stated "It seems that my communitystring has only permissions on the network-interface and nowhere else.". This means he has the access for "interfaces" subtree in MIB only. Such restriction can be easily done per SNMP community in Cisco config. If that's the case then he will not be able to poll objects from "system" subtree for example "system.sysDescr.0".

- Piotr

[TheWitness]

Thanks for the clarification bulek. Sounds like Jens should be requesting access to system. It is harmless enough subtree. It also sounds like what Ian refers to as a "corner case".

TheWitness

[Jtb]

Thanks for the clarification bulek. Sounds like Jens should be requesting access to system. It is harmless enough subtree. It also sounds like what Ian refers to as a "corner case".

It was a rough "fight" with my provider to simply get access to the interface-stats...

[TheWitness]

Looser all of them... (Oh bytb, who is your supplier??). Jens, I also sent you a note on a separate thread. Hope you can help...

TheWitness