TechInfoDepot:DD-WRT/Multi Router Traffic Grapher

The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links. MRTG generates HTML pages containing graphical images which provide a LIVE visual representation of this traffic. MRTG is based on Perl and C and works under UNIX and Windows NT. MRTG is being successfully used on many sites around the net.

The usage of MRTG requires another host to actually run MRTG. The router itself provides its actual usage information over SNMP, but its MRTG's job on another host to keep track and display it. If the host is down for a while, no MRTG data can be recorded for the time beeing.

= Installation =

Router
Using the Web Interface:


 * 1) Goto the "Administration" tab and the "Services" sub-tab
 * 2) Enable "SNMP" and if new options don't appear, Apply Changes.
 * 3) Fill in information in the SNMP section. (Location, Contact, Name, RO Community, RW Community)

Desktop
There are a number of installation guides on the MRTG website.

In the guide, substitute:

public for the RO Community you filled in earlier

10.10.10.1 with the Local IP address of your router.

Windows
You should have Windows IIS installed, or some other web server you're familiar with.

NOTE: Substitute D:\InetPub\wwwroot\ for the wwwroot of your IIS installation.


 * 1) Follow the MRTG guide
 * 2) Remove the line: WorkDir: c:\www\mrtg from the bottom of
 * 3) Make the folder D:\InetPub\wwwroot\MRTG
 * 4) Create a new virtual folder in IIS and point it to D:\InetPub\wwwroot\MRTG
 * 5) Browse to http://127.0.0.1/MRTG to see your traffic logs.

Alternately for a quick look, use STG which will let you monitor 2 OIDs at a time. http://leonidvm.chat.ru/

Use:

* 1.3.6.1.2.1.2.2.1.10.8 for br0 interface (intern LAN port) for download (green) (1.3.6.1.2.1.2.2.1.16.8 upload(blue)) * 1.3.6.1.2.1.2.2.1.10.6 for vlan1 interface (extern WAN port) for download (green) (1.3.6.1.2.1.2.2.1.16.6 upload(blue)) * 1.3.6.1.2.1.2.2.1.10.4 for eth1 interface (WLAN) for download (green) (1.3.6.1.2.1.2.2.1.16.4 upload(blue))

Unix
Follow the guide at: http://oss.oetiker.ch/mrtg/doc/mrtg-unix-guide.en.html

The OID's which MRTG will pick up in a default configuration may be as follows: Currently, there is no way to monitor switched traffic.
 * 5 (eth0) - all routed wired traffic, WAN + LAN
 * 6 (eth1) - all routed wireless traffic
 * 7 (vlan0) - all routed LAN traffic
 * 8 (vlan1) - WAN traffic
 * 9 (br0) - vlan0-eth1 bridge traffic

Depending on the model of your router the interface names and functions can vary. [root@server]# snmpwalk -v2c -c public 192.168.1.1 ifDescr IF-MIB::ifDescr.1 = STRING: lo IF-MIB::ifDescr.2 = STRING: teql0 IF-MIB::ifDescr.3 = STRING: eth0 IF-MIB::ifDescr.4 = STRING: eth1 IF-MIB::ifDescr.5 = STRING: vlan0 IF-MIB::ifDescr.6 = STRING: vlan1 IF-MIB::ifDescr.7 = STRING: br0 IF-MIB::ifDescr.8 = STRING: etherip0 IF-MIB::ifDescr.9 = STRING: ppp0 IF-MIB::ifDescr.10 = STRING: imq0 IF-MIB::ifDescr.11 = STRING: imq1 (DD-WRT v24sp2 on a WRT-54GL, the interfaces seem to have changed from v23, note #8)
 * You can use snmpwalk to display the names of your interfaces: snmpwalk -v2c -c public 192.168.15.2 | grep ifDescr
 * or use the OID within the walk
 * The openwrt wiki has an exhaustive list of router models and interface names on its Configuration page and a nice schematic drawing on its Network Interfaces page.

=SNMPOIDs= If you want to monitor something other than bytes in and out, you must also know the SNMPOID of what you want to monitor. Here is a listing of SNMPOIDs for the DD-WRT firmware. not completed

Some SNMP OIDs can be found in this forum thread: http://forum.bsr-clan.de/ftopic1245.html

Please copy the important OIDs here!!!

For CPU load dd-wrt snmpd provides two sets of MIBs:

1.3.6.1.4.1.2021.10.1.3.1 = 01 min avg, Value is between 0.00 and 1.00. 1.3.6.1.4.1.2021.10.1.3.2 = 05 min avg, Value is between 0.00 and 1.00. 1.3.6.1.4.1.2021.10.1.3.3 = 15 min avg, Value is between 0.00 and 1.00. The values above need to be multiplied by 100 since mrtg does integers.

Example:

Target[10.0.0.1.cpu]: 1.3.6.1.4.1.2021.10.1.3.1&1.3.6.1.4.1.2021.10.1.3.2:public@10.0.0.1: *100

1.3.6.1.4.1.2021.10.1.5.1 = 01 min avg, 1 means 0.01 and 150 means 1.5 1.3.6.1.4.1.2021.10.1.5.2 = 05 min avg, 1 means 0.01 and 150 means 1.5 1.3.6.1.4.1.2021.10.1.5.3 = 15 min avg, 1 means 0.01 and 150 means 1.5

For UP and DOWN traffic on the WAN-side:

1.3.6.1.2.1.2.2.1.10.8 = Total Downloaded in Bytes 1.3.6.1.2.1.2.2.1.16.8 = Total Uploaded in Bytes

For memory usage:

1.3.6.1.2.1.25.2.3.1.5.101 = Total available 1.3.6.1.2.1.25.2.3.1.6.101 = Used

= References = http://oss.oetiker.ch/mrtg/ MRTG website

= External Links =
 * MRTG website
 * MRTG