Simple Network Management Protocol
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* [[Multi Router Traffic Grapher]] | * [[Multi Router Traffic Grapher]] | ||
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[[Category:Advanced tutorials]] | [[Category:Advanced tutorials]] |
Revision as of 02:05, 15 February 2007
The Simple Network Management Protocol (SNMP) is a protocol for monitoring of network-attached devices for any conditions that warrant administrative attention.
Contents |
Wireless Rate Via SNMP
This particular setup is for creating new SNMP values that monitor the Rate setting of the wireless and the RSSI values of specific clients/WDS. I borrowed some of this code and modified it to work with v23. Someone said this came from the Sveasoft forums. Assumes use of DD-WRT v23.
Tools: Getif (SNMP MIB browser)
1) Turn on SNMP in DD-WRT (Administration->Services)
2) Turn on JFFS and clean it (Administration->Management)
3) Log in via SSH and create the following scripts:
/jffs/snmpd/wlrate:
#!/bin/sh /usr/sbin/wl rate |/usr/bin/cut -b 9-10
/jffs/snmpd/wlrssi1:
#!/bin/sh /usr/sbin/wl rssi <mac_address_of_client_or_wds> | /usr/bin/cut -b 10-11
You can repeat wlrssi1 multiple times for each client or WDS you want to monitor. Just increment the number.
Next, type the following into the command-line:
nvram set snmpd_conf="syslocation <your_location> syscontact <your_email> sysname <your_system_name> rocommunity <your_password> rwcommunity <your_other_password> exec Rate /jffs/snmpd/wlrate exec RSSI-CLIENT1 /jffs/snmpd/wlrssi1 " nvram commit reboot
Again, repeat the "RSSI-CLIENT1" line if you have more than 1 client to monitor (incrementing the number, of course).
Test the settings with Getif. You will need to look for .1.3.6.1.4.1.2021.8.1 in the "MBrowser" screen.
Steps:
In "Parameters", type in the IP of the router and the read and write community passwords. Press "Start" and you should see the bottom status say something like "Sysinfo variables OK". Next, go to the "MBrowser" tab and put ".1.3.6.1.4.1.2021.8.1" in the second entry box (it probably says ".1"). Press "Start" and you should see a list of values pop into the lower output screen. You will see your configuration variables, then a list of numbers in the values side. The first 3 numbers will be "0", then your values will show up. First is your "Rate", then each of your RSSI values that you entered above.
Known OID´s via SNMP
This should get important available OIDS for SNMP requst against DD-WRT V23 SP1
OID [dottedt & text format] | MEANING | RANGE of VALUES | CONTENT (example) |
1.3.6.1.2.1.1.1.0 | router description | string | "Linux WRT54G 2.4.20 #2 Thu Sep 9" |
1.3.6.1.2.1.1.3.0 | uptime (in hundredths of a second) | timeticks | "0:9:58:43.95" |
1.3.6.1.2.1.1.6.0 | location entry of this node | string | "Sundhausen" |
1.3.6.1.2.1.25.2.3.1.5.101 | total available memory | kByte/sec | "14072" |
1.3.6.1.2.1.25.2.3.1.6.101 | used memory | kByte/sec | "12428" |
1.3.6.1.4.1.2021.10.1.3.1 iso.org.dod.internet.private.enterprises.2021.10.1.3.1 | CPU-load-1 (1-min average) | fixed-point number [0.00 .. 1.00] | "0.08" |
1.3.6.1.4.1.2021.10.1.3.2 iso.org.dod.internet.private.enterprises.2021.10.1.3.2 | CPU-load-5 (5-min average) | fixed-point number [0.00 .. 1.00] | "0.04" |
1.3.6.1.4.1.2021.10.1.3.3 iso.org.dod.internet.private.enterprises.2021.10.1.3.3 | CPU-load-15 (15-min average) | fixed-point number [0.00 .. 1.00] | "0.08" |
1.3.6.1.4.1.2021.10.1.5.1 iso.org.dod.internet.private.enterprises.2021.10.1.5.1 | CPU-load-1 (1-min average) | integer [0...100] | "8" |
1.3.6.1.4.1.2021.10.1.5.2 iso.org.dod.internet.private.enterprises.2021.10.1.5.2 | CPU-load-5 (5-min average) | integer [0...100] | "4" |
1.3.6.1.4.1.2021.10.1.5.3 iso.org.dod.internet.private.enterprises.2021.10.1.5.3 | CPU-load-15 (15-min average) | integer [0...100] | "2" |
1.3.6.1.2.1.2.1.0 | number of network interfaces iso.org.dod.internet.mgmt.mib-2.interfaces.ifNumber.0 | integer | "11" |
1.3.6.1.2.1.2.2.1.2.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifDescr.* | names of all networkinterfaces | string (replace the .* with a numer from 1 to max interfaces) | "eth1" "imq0" "lo" |
1.3.6.1.2.1.2.2.1.4.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifMtu | size of the largest datagram which can be sent/received on the interface | octets (replace the .* with specific interface from 1 to max interfaces) | "1500" "1454" |
1.3.6.1.2.1.2.2.1.5.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifSpeed.* | interface's current bandwidth | bits per second (replace the .* with specific interface from 1 to max interfaces) | "10000000" |
1.3.6.1.2.1.2.2.1.6.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifPhysAddress.* | interface's physical MAC address | octet-string (replace the .* with specific interface from 1 to max interfaces) | "000625D7D203" |
1.3.6.1.2.1.2.2.1.10.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifInOctets.* | total number of octets received on the interface, including framing characters. | integer (replace the .* with specific interface from 1 to max interfaces) | "3869059965" |
1.3.6.1.2.1.2.2.1.16.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifOutOctets.* | total number of octets transmitted out of the interface, including framing characters. | integer (replace the .* with specific interface from 1 to max interfaces) | "3195287514" |
1.3.6.1.2.1.2.2.1.20.* iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifOutErrors.* | number of outbound packets that could not be transmitted because of errors | integer (replace the .* with specific interface from 1 to max interfaces) | "95332" |
1.3.6.1.2.1.6.6.0 iso.org.dod.internet.mgmt.mib-2.tcp.tcpPassiveOpens.0 | number of passive TCP connections | integer | "2234" |
1.3.6.1.4.1.2021.100.4.0 | current syteme date & time (set in the firmware) | time string | "Wed Jul 12 01:07:03 2006" |
Bandwidth Monitoring via SNMP
You can also use SNMP for bandwith monitoring by using programs like Cacti, MRTG or PRTG Traffic Graphers.
The routers SNMP traffic layout:
(___br0___) / | \ \_ \____ / | \ \__ \_____ / | \ \ \ | [0] [1] [2] [3] [4] | | [wlan] | |vlan1 ---- vlan0 ----- | | | | WAN LAN | | WLAN | | | | | |Internet 1 2 3 4 | | WLAN | <-- label +---------------------------+ +--------+ ethernet switch wireless eth0 (cpu port 5) eth1
Remote Collection of SNMP data via WAN PORT
from DICONS on the forum go to the administration/diagnostics tab, paste in this command and do a "save firewall", then reboot
/usr/sbin/iptables -I INPUT 1 -p udp --dport 161 -j logaccept
it would sure be nice to have this automaticly be applied if SNMP was on and remote admin was enabled, but I suppose it's easy anough to do thru the command....