SNMP / Network Monitoring For Surveillance

************ ******* ********* **** on *** *** *** to report ******, *** **** most ***** **** ***** knowing * ****** ** "down" **** ** ******* or ******** ***********.

******* ********** ******* *** give ***** **** ******* into ***** *******, **** the ****** ** *** switch ** *** *** server, *** *** **** as *** ******* ** expensive ** ** **** in ****** ************ *******. 

*******, *********** ********* ******** can ** ****** ** understanding ***** ********** *********, with **** ******** *********, and ******* ***** ****.

** **** *****, ** take * **** ** network ********** ******** ** surveillance, ******* *** ****** and ******** *********, *** give **** ********* ******** of *** ***.

Topics *******

** **** *****, ** cover ***** ******:

• **** ** ****?
• **** *** ***** *** Requests?
• ******* ********** ******** ******
• **** *********** **********
• ***** ******* ********** ******* Demonstration
• **** ***** ******
• ***** **** *****
• ****** **** *******
• *** **** ********
• ************ *** *******
• ******* ****** ******* ****
• ************ ************
• ****** **********
• ******/*** **********
• ******/****** **********
• ***** ******* *******

[***************]

What ** ****?

****** ******* ********** ******** (SNMP) ** **** ** monitor ****** *** *********** information ** ********* *******. This *********** ** ****** requested ** ** "*******", such ** ** **** monitoring ******, ** **** as * ******* (****** * "trap") ** * ******.

• ******** ********* ******* ******** information, **** ** *** usage, *********, **** ***** speed, ***. **** ** these ********** ********* ******** a "******" ******* ** an **** ********** ********, discussed *****.
• ***** *** **** ** notify *** ******* ** significant ******, **** ** temperature ******, ***** ****** failures, ****** *********, ***., which ** *** **** a ******** ******.

Network ********** ********

******* *** ********* ***** a *********** ********** ******** which ********** **** ******** and ***** (** **** as ***** *********) *** presents ****** ***********, **** often ***********. ******* **** as *******, *******, ********, etc., *** ***** (**** like ****** ******* ** a ***) *** *** or **** "*******" ********** with ****. * ****** includes ******** ***** *** be *********, **** ** pings, ******, *********, ** throughput.

***** *** **** ******* monitoring ********* *********, *** with******* *********** *** ******** support, **** **** *** free. Some ******* ********* *******:

• ****: **** *** ** to *** *******,******* *********** ****** ****** ******.
• **********: ******* ********
• **********: **** 
• ******* ****: ******* ********
• ************:******* ********, **** ****** *******.

** *** ************** *** this *****, ** **** PRTG ******* ** ** one ** *** **** popular ********* *********. ************, it ****** * **** variety ** ****** ***** (SNMP, ******* ********** ***************, SSH *** *****/***, ****, Ping, *** ****), *** free ********* *** ** to *** *******.

SNMP *********** **********

******** *** **** ******* to ********* **** *****, since *** ******* **** know ***** ******** **** parameters ** ******* *** how ** ********* *** response (******* ** * camera/VMS ***********), ***** ***** are ********* **** ** a *** *****.

************, ***** ** ** standard *** ***** ******** a ******** ****** ********, so *** ******* ***** some ************* *** ******* SNMP ******* ** *** devices, ****** ** ***. Worse, **** ** ****** documented ** ******/******** *************, leaving ***** ** ********** for ********** ** **** out ******* **** ******* are *********.

Using ******* ********** *******

**** ***** ************ *** basics ** ****** ******* as **** ** *********** and ********** ******* ** network ********** ********:

SNMP *****

***** *** ********* ***** a ******* **** ** sensor, ****** ****** * receiver, ***** ** **** to ******* *** ********* trap **** **** ****** information. ** ***** *** form, ***** ******* ******* syntax **** ********* *********** sometimes ********* ** **** or *** ** ***** text. *** ******* *** manufacturer's ***** **** **** this:

******-***-**::***********.****.*.*.*.*.*.* = *

******-***-**::***********.****.*.*.*.*.*.* = *

******* **************, **** ******* is ******* ** *** user. However, **** *** **** is ********** **** ****** information, ** *** ** used ** ****** ****** or ******** **** ******** events.

** ****** ***** ** this *****:

Device **** *******

**** ******** ****** ** device, **** ******* ********* providing *** ***** ***********, while ******* *** ******** provide **** ******.

• *******:**** ** ******* ** not ******* *** *********** requests, ** *** ******* to ****** **** *** HTTP *******. * *** manufacturers (**** ** ******, discussed *****) ******* **** detailed *******, ***** ******, including ** ********, ****, and *********, ******* **** detail *** *** ***** (explained *****), **** ** Ethernet **********, ***********, *** local ********* ******, *** this ** ****. **** cameras **** ******* ******* for ***** **** *****, though *** ***** ****** and *** ******** ****** widely. 
• ******* (*******/*****): ******* ******* **** ******** information, ********* ******** *********** metrics, **** ** *** load, ********** ** *** out, ****** *****, **** I/O, *** ****. *******, server **** ************* ** more ******* *** ** the ****** ** ******* supported *** *** ******* trial *** ***** ** see ******* ***** ********** do *** ** *** work.
• ******** ****: ****** *** *******, ******** NVRs ****** ******* **** sensors, ** ***** *** of *** ***. **** may ** ********** *** manufacturer *** ***** **** cameras, *** **** ** uncommon.
• ******* ********:*******, **** ******* ******** deliver ******** ***********, ********* on * **** ** port *****. ********** ** and *** *** **** port *** ** ******, along **** ******,**** *******, *** ****. *******, note **** ********** ***** port ** * ****** may ** ******, ** each **** ** ********* seen ** * ******** sensor ** ********** *********, and **** ******* *******. Because ** ****, *** ports **** ** ****** uplinks ** ******** *********** may ** ********* *******.

Dealing **** ****

**** ** **** ****** device ************* **** ********* SNMP ***************, ******* ********** developers ****** ** ******** to ********* **** *** interpret *** ** ****. Because ** ****, ************* may ******* *** ***** (Management *********** ****) ***** contain ******* ** ***** requests *** ***** **** support. ***** ***** *** then************ *** ******* ********** application ***** **** **** to ********* **** ****.

**** ***** ***** *** contents ******' *** ***** (******** available *** ********), ***** *** ****** to ****:

MIBs ********

**** **** *** ***** are **** ** ************ and *** ********* *** all *************. ***** ****** not ****** **** **** may ****** ******** * MIB ** ******* ***** cameras ** ********* ** detail. **** ***** ***** manufacturers ***** ***** ****, exactly **** ******* *** supported ******, ** *** application ** **** ***** and ***** *** *************** than **** *** **** expected ***********.

******* ************* ******** ***** MIBs, *********:

• ********
• ****
• ******
• *********
• *****

**** **** **** *** also ** ******** ********* using******* *****. *******, **** ** a **** ********* ******* and ****** *** ***** of **** *****.

Default ****** ******* ****

** *** *****, ***** are *** ************* ***** include **** ******** ******* out ** *** ***, without ********* *** *****. For *******, ****** ******** Ethernet *******, *** ****, and ** **** **** space ***** ******** **** sensors, *** ****. *******, this ******* ** **** rare.

************ ************

***** *** ******* *** cases ***** ******* ********** may ** ** *********, including:

• ****** **********
• ******/*** **********
• *******/********
• ***** ******* (***, ********)

****** **********

***** *** ******* ******* basic *********** ** *******, ********* up/down ****** *** **********, SNMP *** ********** ********** systems *** ******* **** detail.

• ********** ********** **** ** a ******, ***** *** be ******* ** *** camera ****** ***** ***** extreme ******, ***** *** indicate ***** ****, **** if *** ****** ** still ***** ** ** and ********** ** *****. This ********** *** ** performed ****** ** *** camera (********* ***) ** at *** ****** **** (bandwidth **). *** *******, "Traffic **" ** *** switchport ***** ***** * camera ****** **** ** ~3.4 **/* (*,*** **/*). 

• ************, ***** * ****** to ***** **** *** page ****** ** *** camera's *** ********* ***** whether *** ****** ** responsive, ********** ** ******* it ** ********** ** ping ** ***. **** is *** ********* ********** that * ****** *** failed, ** ***** ******** on *** ****** *** stop (*** ******, *********, etc.) ***** ** ***** responds ** *****.
• *******, **** ** **** pings *** ** *********, users *** *** *** only ** *** ****** is ** ** ****, but ********* ** *******, as ****. **** ***** indicate *** ****** ******** overtaxed, **** ** ******* of **** ******, ** trying ** **** ** with ******* *** *** compression/high *********/**** ********* *********.

** ******** ** ************, users *** **** **** graphs ** ******** ****, which *** ** **** to **** *** **** disk ********, ****** ******* are ********* ** ******** bitrates, ***. *** *******, the ***** ***** ***** information *** ******* ** volume *** ***** **** a ** *** ******, with *** ****** ********* ~665 ** ** ******* space, *** ********* ***** 6.2 ** *** ******. 

Server/Recording **********

******* ********** ******* *** be **** ** ******* basic ****** ***********, **** as *** *** ****** load, **********, *** ****. While ***** ********** *** available ***** *********** ******* or ***** *****, ***** a ********** ****** *********** this *********** *** ******** servers, *** ****** *** better ******* *** ***** alerts **** * *********** location.

**** **** ****** ******** Windows ******** ** ** monitored. **** ****** ***** better ********** ** ******** system ****** *** **** troubleshooting ***********, ***** ******* stops/starts *** ****** *** may ** ********** ** other ******, **** ** high **********, **** *** usage, ***.

*******, ****** ***** *** be ********* ** **** at * **** ***** whether ***** ** ***** recorded ** ***. ** monitoring **** ****** ********* per ******, ***** *** be ******* ** **** traffic ***** ***** ** expected *****. *** *******, if ******* *** ***** written ** **** ** a ******* ** ** Mb/s, *** **** ****** drop ** *** **/*, but ******* *** ***** up *** *********, ***** is ****** * ****** recording ***** ***** ***** should ***********.

********/*******

** **** *****, ****** ports *** ** *** only *** ** ********** camera ********** ** *** camera **** *** ******* the **** ******* ****** or ******* ********** *** MIB *****. *******, **** that ********** ****** ***** requires ******** *******, ***** typically **** ******* * license. *** *******, ******* at * ** **** switch *****, ** *** see **** **** ** displayed ********** (****************, ****************, etc.). ********** *** ***** of **** ****** ***** require ** ******** ******* (48 *** ***** **** 4 *******), ****** ** more ****** **** **** key ***** (******** *******, servers, *******) ***** ** monitored.

******* **** ******** * sensor ******* **** ****, but *** ********* ***** port ***** **** ********. Routers **** ********** ******* additional *********** ** ***** services, **** ** ******** traffic ** *** *******, which *** ** ****** in *****-**** *******. *** instance, *** ******* ***** shows * ********* ****** in ****, ********** ******** VPNs:

Other *******

** ******** ** **** surveillance **********, ***** *** be ********** ** ********** related ******* ** ****, such ***** (*************** ***** ******), ******** ******, ** access ******* *******. *** specific ******* ********* *** each **** ******, **** UPSes ***** **** ********* with ******** *********** ***** access ******* *** **** support **/**** ****** ** devices. 

Example ******* *** ******

*******, ** **** ***** we ****** ****** ******* and ****** ***** *** be **** *** **** in ************ **********:

Test **** *********

***** **** ** **** * * question ****.

[[****: **** ***** *** originally ******* ** **** but ************* ******* ** 2018 ** ******* ******** device ************, *** ************, and ******** ******** ** monitoring *** ******* *******]]