Multi Router Traffic Grapher
From DD-WRT Wiki
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.
Using the Web Interface:
- Goto the "Administration" tab and the "Services" sub-tab
- Enable "SNMP" and if new options don't appear, Apply Changes.
- Fill in information in the SNMP section. (Location, Contact, Name, RO Community, RW Community)
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.
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.
- Follow the MRTG guide
- Remove the line: WorkDir: c:\www\mrtg from the bottom of
- Make the folder D:\InetPub\wwwroot\MRTG
- Create a new virtual folder in IIS and point it to D:\InetPub\wwwroot\MRTG
- 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/
* 220.127.116.11.18.104.22.168.1.10.8 for br0 interface (intern LAN port) for download (green) (22.214.171.124.126.96.36.199.1.16.8 upload(blue)) * 188.8.131.52.184.108.40.206.1.10.6 for vlan1 interface (extern WAN port) for download (green) (220.127.116.11.18.104.22.168.1.16.6 upload(blue)) * 22.214.171.124.126.96.36.199.1.10.4 for eth1 interface (WLAN) for download (green) (188.8.131.52.184.108.40.206.1.16.4 upload(blue))
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:
- 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
Currently, there is no way to monitor switched traffic.
Depending on the model of your router the interface names and functions can vary.
- 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
[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)
- 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.
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.
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:
220.127.116.11.4.1.2021.10.1.3.1 = 01 min avg, Value is between 0.00 and 1.00. 18.104.22.168.4.1.2021.10.1.3.2 = 05 min avg, Value is between 0.00 and 1.00. 22.214.171.124.4.1.2021.10.1.3.3 = 15 min avg, Value is between 0.00 and 1.00.
The values above need to be multiplied by 100 since mrtg does integers.
Target[10.0.0.1.cpu]: 126.96.36.199.4.1.2021.10.1.3.1&188.8.131.52.4.1.2021.10.1.3.2:email@example.com: *100
184.108.40.206.4.1.2021.10.1.5.1 = 01 min avg, 1 means 0.01 and 150 means 1.5 220.127.116.11.4.1.2021.10.1.5.2 = 05 min avg, 1 means 0.01 and 150 means 1.5 18.104.22.168.4.1.2021.10.1.5.3 = 15 min avg, 1 means 0.01 and 150 means 1.5
For UP and DOWN traffic on the WAN-side:
22.214.171.124.126.96.36.199.1.10.8 = Total Downloaded in Bytes 188.8.131.52.184.108.40.206.1.16.8 = Total Uploaded in Bytes
For memory usage:
220.127.116.11.18.104.22.168.22.214.171.124 = Total available 126.96.36.199.188.8.131.52.184.108.40.206 = Used
http://oss.oetiker.ch/mrtg/ MRTG website