SNMP Information from your DLink DSL-300 ADSL Modem

Not many people know it, but the DLink DSL-300 ADSL modem has SNMP management capabilities. And for such a small and cheap network device, its not too bad an implementation of it. Or perhaps I’ve just seen a lot of dead-awful ones to compare objectively. Of course the displaying of the private community in the MIB, which is something the DSL-300 does, is a pretty dumb idea.

I should point out right here that these instructions work for me. They might work for you, or you might just find some easter egg in the modems firmware that turns it into a smoke machine So do any of this stuff at your own risk.

You will have to connect to the modem using a serial port first to find out the IP address and change either your computers or the modems IP address so they are in the same network. Note that this address is not the same as the one your provider gives. And the communities are the very hard to guess public and private for read-only and read-write respectively.

The modem has some of the standard SNMP MIBs that anyone who’s played with SNMP will quickly recognise, such as.

* system information
* interface information including the ifTable
* IP MIB – Packets in out, discards etc
* ip routes
* TCP MIB
* SNMP MIB, which is statistics about the agent itself
* SNMPv2-SMI::mib-2.17.4

All pretty standard stuff you see in pretty much any device. All the good information is always found in the private enterprises part of the MIB, and the DSL-300 is no exception. The problem is that if you ask
DLink about it, they will tell you nothing. The nice thing about DLink is they’re pretty consistent about annoying the hell out of their customers by denying them technical information.

With that rant out of the way, its time to work out for myself what these values are for. I’ve got some worked out but it will take some more time to get it all clear and possibly some will never be worked out, thanks DLink!

All OIDs start with private.enterprises.171.11 There are quite a few gaps so if you know what the missing values mean, drop me a line.

OID Type Description
1.1.1.0 STRING Software version eg “R1.14AU”
1.1.2.0 STRING PROM firmware version “Ver. 1.00”
1.1.3.0 STRING Hardware version “Rev. 1.00”
1.1.4.0 INTEGER Management Protocols supported: 2=snmp-ip
1.1.5.1 Table Table showing what MIBs are supported
1.1.5.1.1.X INTEGER  – Index of Table
1.1.5.1.2.X STRING  – Name of MIB supported eg “DSL504-MIB”, “RFC1213-MIB”
1.1.5.1.3.X INTEGER  – Version of MIB supported
1.1.5.1.4.X INTEGER  – Type of MIB
30.1.1.0 INTEGER Bridge/Router: 1=PPPoA-Router, 2=PPPoA-Bridge, 3=RFC1483-Router, 4=RFC1483-Bridge
30.1.2.0 INTEGER Config Save 1
30.1.3.0 INTEGER System Restart 1
30.1.4.0 INTEGER ?? 1
30.2.1.0 INTEGER ADSL Driver Mode: 0=link down, 1=T1-413, 2=G-lite, 3=G-DMT
30.2.2.0 INTEGER Upstream rate in kbps
30.2.3.0 INTEGER Downstream rate in kbps
30.2.4.0 STRING Device driver version
30.2.5.0 INTEGER ADSL Link Status: 0=Idle, 1=Connecting, 2=Connected
30.2.6.0 INTEGER Driver Path: 0=Fast, 1=Interleave
30.2.7.0 INTEGER Near End FEC line error count
30.2.8.0 INTEGER Far End FEC line error count
30.2.9.0 INTEGER Near End CRC line error count
30.2.10.0 INTEGER Far End CRC line error count
30.2.11.0 INTEGER Near End HEC line error count
30.2.12.0 INTEGER Far End HEC line error count
30.2.13.0 INTEGER Near End LOS (Loss Of Signal) count
30.2.14.0 INTEGER Far End LOS (Loss Of Signal) count
30.2.15.0 INTEGER Near End LOF (Loss Of Frame) count
30.2.16.0 INTEGER Far End LOF (Loss Of Frame) count
30.2.17.0 INTEGER Near End line error count
30.2.18.0 INTEGER Far End line error count
30.2.19.0 INTEGER Near End Alarm Indication Signal: 0=no alarm, 1=alarm
30.2.20.0 INTEGER Far End Alarm Indication Signal: 0=no alarm, 1=alarm
30.2.21.0 INTEGER Near End Remote Defect Identification: 0=no defect, 1=defect
30.2.22.0 INTEGER Far End Remote Defect Identification: 0=no defect, 1=defect
30.2.23.0 INTEGER Upstream Capacity (in percent)
30.2.24.0 INTEGER Downstream Capacity (in percent)
30.2.25.0 INTEGER Upstream line attenuation
30.2.26.0 INTEGER Downstream line attenuation
30.2.27.0 INTEGER Upstream Noise Margin
30.2.28.0 INTEGER Downstream Noise Margin
30.2.29.0 INTEGER Upstream Output Power
30.2.30.0 INTEGER Downstream Output Power
30.2.31.0 INTEGER Link retrain count
30.2.32.0 Array Carrier Load Array
30.2.33.0 INTEGER Unable to initialize count
30.2.34.1.1.1-96 INTEGER A 96 row table, index column. The value equals the instance.
30.2.34.1.2.1-96 INTEGER Near End Error Second
30.2.34.1.3.1-96 INTEGER Far End Error Second
30.2.35.0 INTEGER Near End Error Second count for the day
30.2.36.0 INTEGER Far End Error Second count for the day
30.2.37.1.1.1-7 INTEGER Error Second for the day table – instance. Value = instance
30.2.37.1.2.1-7 INTEGER Near End Error Second count for the day
30.2.37.1.3.1-7 INTEGER Far End Error Second count for the day
30.3.1.0 INTEGER Spanning Tree State: 0=other, 1=disabled, 2=enabled
30.3.2.0 INTEGER VPI of bridged PVC
30.3.3.0 INTEGER VCI of bridged PVC
30.4.1.1.1.1 INTEGER Index of table
30.4.1.1.2.1 IpAddress IP address of modem
30.4.1.1.3.1 IpAddress Network mask of modem
30.4.1.1.4.1 INTEGER Send RIP 1=RIPv1 2=RIPv2 3=Both RIP 4=None
30.4.1.1.5.1 INTEGER Accept RIP 1=RIPv1 2=RIPv2 3=Both RIP 4=None
30.4.1.1.6.1 INTEGER IP Forwarding: 2=None 3=All
30.4.1.1.7.1 INTEGER DHCP Client: 1=other, 2=disabled, 3=enabled
30.4.1.1.8.1 INTEGER NAT State: 1=other, 2=disabled, 3=enabled
30.4.2.1.0 INTEGER Static Route Count 0
30.4.3.1.1.1.6
 .112.117.98.108.105.99
Hex-STRING SNMP read-only community, 28 bytes long with 0 padding. eg fred = 66 72 65 64 00…
30.4.3.1.1.1.7
 .112.114.105.118.97.116.101
Hex-S SNMP read/write community, same encoding as Read-only
30.4.3.1.1.2.6
 .112.117.98.108.105.99
INTEGER ?? 1
30.4.3.1.1.2.7
 .112.114.105.118.97.116.101
INTEGER ?? 2
30.9.1.0 IpAddress IP address of TFTP server
30.9.2.0 String Remote filename on TFTP server
30.9.3.0 String Local filename
30.9.4.0 INTEGER Set to 1 to make modem connect to server
30.9.5.0 INTEGER Set to 1 to get remote file
30.9.6.0 INTEGER TFTP status: 0=idle, 1=Wait ACK, 2=Wait Data, 3=Sent Write Request, 4=Sent Read Request, 5=Done

Some definitions you might find useful:

* Error Second (ES) – Any second where at least one bit error was received.