how can i monitor my server

7/23/2019 How Can I Monitor My Server

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How Can I Monitor My Servers and NetworkedDevices Connection Status?

Overview

What is a Networked Device?How do networks work?

Diagram of OSI Model

Diagram of Simple NetworkWhat protocol is used for device status?

What is ICM?

What is a ing?How can I use ICM to conduct a ing?

What is ing Wi!ard?

Can "ou show me an e#ample of how ing Wi!ard works?$%isual &asic'

$%&Script'$(ctive Server ages'

$%isual C))'$%isual *o#ro'

Where can I find more information a+out ing Wi!ard?

Who is Seekford Solutions, Inc-?

Overview

( lot if time is spent designing and implementing network designs and setting up devices

like computers, servers, .C/I connected e0uipment and more- 1ven with the +est plansand architecture there is alwa"s the uncertaint" of device failure or link failure- When "ou

have distri+uted applications or a critical servers and devices, it +ecomes that much moreimportant to have a method of monitoring the devices to see if the" are online, alive, andreacha+le on the network- .his article will e#plain a rough overview of how networks

work, how devices are connected and how "ou can write software to monitor them

activel"-

What is a Networked Device?

( networked device can +e an"thing from a mainframe server, a printer all the wa" to

custom .C/I implementing devices that monitor pump operations and pressure

integrit" or even displa" and communication devices- With regards to this article, aNetworked Device is an" hardware that is logicall" connected to a network, and uses the

.C/I communication protocol- .his means we+ servers, personal computers and even"our network ena+led coffee machine are considered Networked Devices-

How do networks work?

( network is a set of interconnected devices that can all speak the same language- .here

are man" different t"pes of networks, .oken2ring, I3, (pple.alk, .C/I, and evenproprietar" communications used +" some 4C5s and other hardware- .he scope of this

article will cover .C/I networks, +ut the ph"sical la"out is the same for most t"pes of
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networks- .C/I stands for .ransmission Control protocol/Internet rotocol- .he

standard network is a com+ination of 1thernet and possi+l" wireless connected

communication devices-1ver" device that is connected to the network is considered a node on the network- (

device must have a uni0ue address that identifies it when communicating- .his is where

I addresses come- When the device +oots up, it either assumes a preset I address orre0uest an open address from a DHC server- DHC servers are useful +ecause the"

assign open addresses to new devices- No two devices can have the same I address on

the network otherwise connection pro+lem will occur-Devices speak on the network using network interface hardware that has +uilt2in logic for

the actual ph"sical communication- In an 1thernet network, communication takes place

in a manner that is similar to the wa" a group of friends talk- 1ach device waits until the

line is 0uiet, no one is transmitting, and then +egins to transmit their own message- It ispossi+le for two devices to start talking at the same time- .his is detected +" the

transmitting devices +ecause the" listen to the data as it is sent and if their data is not

what the" think it should +e, the" stop transmitting and wait a random amount of time

+efore checking and transmitting again- .his random time is important +ecause if the"waited the same amount of time, an infinite loop would +e created as each of the devices

kept colliding-

Diagram of OSI Model

Diagram of Simple Network


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What protocol is used for device status?

.he network has +een descri+ed as using .C/I as the +asis for communication- .he

relevant part of that is the I or Internet rotocol- .his has a su+set, which allows forsome standard functionalit" for communicating with devices- One such functional level iscalled ICM or Internet Control Messaging rotocol-

What is ICM?

ICM, or Internet Control Messaging rotocol, supports packets containing error, control,and informational messages- It is a critical part of the Internet rotocol module and is

re0uired to +e implemented in all I stacks- ICM is used for transmitting messages a+out


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the status of packet sends, network pro+lems and more- .he relevant part of the ICM

that is used for checking if a device is online is the 1CHO command- .raditionall" this is

called a ing, since this the name of the utilit" from 6NI3 that utili!ed the command-

What is a in!?

ing is actuall" the name of a utilit" written +" a programmer for the 6ni# operatings"stem +ut now has +ecome s"non"mous with the ICM 1cho command- ( ing works

+" sending a special packet of data to a host machine and then waits for the response- .he

time it takes for this response is called the 7.. or 7eturn .rip .ime- .he longer the time,

the worse the network link is +etween the client and host machines- If there is noresponse, then it can +e assumed that either the network link has +een +roken or the host

is not currentl" online or active-

It is often +elieved that 8ing8 is an a++reviation for acket Internet 9roper, +ut ing:sauthor has stated that the names comes from the sound that a sonar makes- We tend to

like the acket Internet 9roper since it seems a +etter techie term-

How can I use ICM to conduct a in!?.o implement the ICM protocol there are a couple of wa"s of handling it- .he main wa"

is to create a 7(W socket and format a special data packet that is sent using an I packet

to the host- .his can +e complicated since it re0uires a lot of knowledge a+out how

Sockets work and also a+out Network +"te ordering which is different from the Intel +"teordering used in most C5s memor"- .he eas" wa" of handling a ing is to use ing

Wi!ard- It is an (ctive3 control that works in a normal container application or even in

scripted languages like %&Script and (ctive Server ages-

What is in! Wi"ard?

ing Wi!ard is an (ctive3 control created +" Seekford Solutions, Inc- that makes sending

ings ver" simple- Onl" one line of code is needed to actuall" issue the ing- It thenprovides a lot of information from the host such as the 7.. or 7eturn .rip .ime, the

..4, or .ime to 4ive, and response data provided +" the host- Monitoring network

connections +ecomes incredi+l" eas" with this tool and implementation into "ourapplication is trivial-

Can you show #e an e$a#ple of how in! Wi"ard works?

&elow is source code for a variet" of different programming languages that can use ing

Wi!ard- If "ours is not listed, then use the code +elow to provide a guide for "our coding-.he source code shows actual use for the product and possi+le data manipulation, so

some of it ma" +e lengthier than needed for the simplest functionalit"-

[Visual Basic]

Dim+O; (s String

DimsCurrentIN9 (s String

is an Instance of ing Wi!ard %ersion = on the *orm ingWi!ard=>-7esolveNumericI.oHostName .rue


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sCurrentIN9 @>A=->B-->E -ingWithout7(WFsCurrentIN9G

If+O; .hen Msg&o# CStrFingWi!ard=>-(ddressG @ ConnectedE v+C74* J

@(ddress NameK @ ingWi!ardv=>-(ddressName v+C74* J

@7..K @ CStrFingWi!ard=>-7..G1lse

Msg&o# CStrFingWi!ard=>-(ddressG @ *(I41DE v+C74* J

@1rrorK @ ingWi!ard=>-4ast1rrorDescription 1nd If

[VBScript]

< .his is a comprehensive e#ample showing the results like "ou would see from the

IN9-131 programsetM"IN9Wi!ard CreateO+LectF8IN9WI(7D-IN9Wi!ardCtrl=8G

.o

iacketsSent iacketsSent ) > +IsOk M"IN9Wi!ard-ingWithout7(WF8www-SeekfordSolutions-com8G

If+IsOk .hen

iackets7eceived iackets7eceived ) >

sData 87epl" from 8 M"IN9Wi!ard-(ddress 8$8 M"IN9Wi!ard-(ddressName 8'K +"tes8 J

CStrFM"IN9Wi!ard-7epl"Data4engthG 8 time8 CStrFM"IN9Wi!ard-7..G 8ms ..48 CStrFM"IN9Wi!ard-..4G

IfFiacketsSent >G .hen

iMinms M"IN9Wi!ard-7..

1lse iMinms IIfFiMinms M"IN9Wi!ard-7.., M"IN9Wi!ard-7..,

iMinmsG

1nd If iMa#ms IIfFiMa#ms P M"IN9Wi!ard-7.., M"IN9Wi!ard-7..,

iMa#msG d(veragems FIIfFiackets7eceived >, M"IN9Wi!ard-7.., d(veragemsG) M"IN9Wi!ard-7..G / =

1lse

iackets4ost iackets4ost ) > sData 81rrorQ 1rror num+erK 8 CStrFM"IN9Wi!ard-4ast1rrorNum+erG

8 1rror DescriptionK 8 M"IN9Wi!ard-4ast1rrorDescription

1nd If


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sMSg smSg sdata v+crlf

Ne#t

smsg smsg v+Cr4f 8ing statistics for 8 M"IN9Wi!ard-(ddress 8K8 v+Cr4f

smsg smsg 8acketsK Sent 8 cstrFiacketsSentG 8, 7eceived 8

cstrFiackets7eceivedG 8, 4ost 8 iackets4ost 8 F8 cstrFFFCD+lFiackets4ostG R CD+lFiacketsSentGG >GG 8T lossG,8 v+Cr4f

smsg smsg 8(ppro#imate round trip times in milli2secondsK8 v+Cr4f

smsg smsg v+.a+ 8Minimum 8 cstrFiMinmsG 8ms, Ma#imum 8 cstrFiMa#msG 8ms, (verage 8 cstrFCIntFd(veragemsGG 8ms8 v+Cr4f

msg&o#sMsg

functionII*Fa,+,cG

ifa theniif +

else

iif c

end ifend function

[Active Server Pages]

PT

dims(ddress.oing

s(ddress.oing @localhostE

setM"IN9Wi!ard Server-CreateO+LectF8IN9WI(7D-IN9Wi!ardCtrl=8G7esponse-writeF8ing .imeoutK8 ) CStrFM"IN9Wi!ard-.imeoutG ) v+crlfG

7esponse-writeF8ing acket Si!eK8 ) CStrFM"IN9Wi!ard-acketSi!eG ) v+crlfG

7esponse-writeF8IN9 addressK888 ) s(ddress.oing ) 8888G

7esponse-writeF8PH78G +IsOk M"IN9Wi!ard-ingWithout7awFs(ddress.oingG If+IsOk .hen

iackets7eceived iackets7eceived ) >

sData 87epl" from 8 M"IN9Wi!ard-(ddress 8$8 M"IN9Wi!ard-(ddressName 8'K +"tes8 J

CStrFM"IN9Wi!ard-7epl"Data4engthG 8 time8

CStrFM"IN9Wi!ard-7..G 8ms ..48 CStrFM"IN9Wi!ard-..4G


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IfFiacketsSent >G .hen

iMinms M"IN9Wi!ard-7..

1lse iMinms IIfFiMinms M"IN9Wi!ard-7.., M"IN9Wi!ard-7..,

iMinmsG

1nd If iMa#ms IIfFiMa#ms P M"IN9Wi!ard-7.., M"IN9Wi!ard-7..,

iMa#msG

d(veragems FIIfFiackets7eceived >, M"IN9Wi!ard-7.., d(veragemsG) M"IN9Wi!ard-7..G / =

1lse

iackets4ost iackets4ost ) >

sData 81rrorQ 1rror num+erK 8 CStrFM"IN9Wi!ard-4ast1rrorNum+erG 8 1rror DescriptionK 8 M"IN9Wi!ard-4ast1rrorDescription

1nd If

7esponse-writeFsData v+Cr4fG

Ne#t7esponse-writeF v+Cr4f 8ing statistics for 8 M"IN9Wi!ard-(ddress

8K8 v+Cr4fG7esponse-writeF8acketsK Sent 8 cstrFiacketsSentG 8, 7eceived 8

cstrFiackets7eceivedG J

8, 4ost 8 iackets4ost 8 F8 cstrFFFCD+lFiackets4ostG RCD+lFiacketsSentGG >GG 8T lossG,8 v+Cr4fG

7esponse-writeF8(ppro#imate round trip times in milli2secondsK8 v+Cr4fG

7esponse-writeFv+.a+ 8Minimum 8 cstrFiMinmsG 8ms, Ma#imum 8

cstrFiMa#msG 8ms, (verage 8 cstrFCIntFd(veragemsGG 8ms8 v+Cr4fGT

[Visual !!]

Assumptions:

mJingWi!ard is a mem+er varia+le for an Instance of ing Wi!ard v= on a

dialog

mJ7esponse is a mem+er varia+le for a te#t+o# on a dialog-Code:

char +uff$='V

int iacketsSent V

int iackets7eceived Vint iackets4ost V

dou+le d(veragems Vint iMinms Vint iMa#ms V

mJingWi!ard-6nlockingWi!ardF88GV

mJingWi!ard-SetacketSi!eFatolFmJacketSi!eGGVmJingWi!ard-Set.imeOutFatolFmJ.imeOutGGV

mJingWi!ard-Set7esolveNumericI.oHostNameFmJ7esolveNumericGV


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mJ7esponse 8inging 8 ) mJ(ddress.oing ) 8 with 8 ) mJacketSi!e ) 8

+"tes of dataKRrRnRrRn8V

forFint iInde# ViInde# PViInde#))G

iacketsSent))V

if FmJingWi!ard-ingWithout7(WFmJ(ddress.oingGG

mJ7esponse ) 87epl" from 8 ) mJingWi!ard-9et(ddressFG )

8$8 ) mJingWi!ard-9et(ddressNameFG ) 8'K +"tes8VJitoaFmJingWi!ard-9et7epl"Data4engthFG,+uff,>GV

mJ7esponse ) CStringF+uffG ) 8 time8V

JitoaFmJingWi!ard-9et7ttFG,+uff,>GV

mJ7esponse ) CStringF+uffG ) 8ms ..48VJitoaFmJingWi!ard-9et.tlFG,+uff,>GV

mJ7esponse ) CStringF+uffG ) 8RrRn8V

iackets7eceived))V

if Fiackets7eceived >G

iMinms mJingWi!ard-9et7ttFGVXelse

iMinms FiMinms mJingWi!ard-9et7ttFGG ?mJingWi!ard-9et7ttFG K iMinmsV

X

iMa#ms FiMa#ms mJingWi!ard-9et7ttFGG ? iMa#ms K

mJingWi!ard-9et7ttFGVd(veragems ) mJingWi!ard-9et7ttFGV

Xelse

JitoaFmJingWi!ard-9et4ast1rrorNum+erFG,+uff,>GV

mJ7esponse ) mJingWi!ard-9et4ast1rrorDescriptionFG ) 8RrRn8

Viackets4ost))V

X

X

d(veragems / iackets7eceivedVmJ7esponse ) 8ing statistics for 8 ) mJingWi!ard-9et(ddressFG ) 8 KRrRn8V

JitoaFiacketsSent,+uff,>GV

mJ7esponse ) 8acketsK Sent 8 ) CStringF+uffG ) 8, 7eceived 8VJitoaFiackets7eceived,+uff,>GV

mJ7esponse ) CStringF+uffG ) 8, 4ost 8V

JitoaFiackets4ost,+uff,>GVmJ7esponse ) CStringF+uffG )8 F8V

JitoaFFFdou+leGiackets4ost / Fdou+leGiacketsSentG >,+uff,>GV

mJ7esponse ) CStringF+uffG ) 8T lossG,RrRn8V

mJ7esponse ) 8(ppro#imate round trip times in milli2secondsKRrRn8V


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JitoaFiMinms,+uff,>GV

mJ7esponse ) 8RtMinimum 8 ) CStringF+uffG ) 8ms, Ma#imum 8V

JitoaFiMa#ms,+uff,>GVmJ7esponse ) CStringF+uffG ) 8ms, (verage 8V

JitoaFFintGd(veragems,+uff,>GV

mJ7esponse ) CStringF+uffG ) 8msRrRn8V(f#Message&o#FmJ7esponseGV

[Visual "o#Pro]

Assumptions:

.hat a dialog has the ingWi!ardv= o+Lect on it name M"IN9Wi!ard or that thecreateo+Lect command is used-Code:

set M"IN9Wi!ard CreateO+LectF8IN9WI(7D-IN9Wi!ardCtrl=8G 6ncomment the a+ove line of code and remove the .HIS*O7M ids if "ou

want to create the o+Lect at runtime

.HIS*O7M-M"IN9Wi!ard-6nlockingWi!ardF88G

.HIS*O7M-M"IN9Wi!ard-7esolveNumericI.oHostName -t-

localsData,+IsOk,iInde#,iacketsSent ,iackets7eceived ,iackets4ost

,d(veragemssData 88

+IsOk -f-

iInde#

iacketsSent iackets7eceived

iackets4ost

d(veragems

iMinms iMa#ms

sMsg 88dacket4oss

*oriInde# > .o

iacketsSent iacketsSent ) >

+IsOk .HIS*O7M-M"IN9Wi!ard-ingWithout7awF8www-SeekfordSolutions-com8G

If+IsOk .hen

iackets7eceived iackets7eceived ) > sData 87epl" from 8 ) .HIS*O7M-M"IN9Wi!ard-(ddress ) 8$8 )

.HIS*O7M-M"IN9Wi!ard-(ddressName ) 8'K +"tes8 )S.7F.HIS*O7M-M"IN9Wi!ard-7epl"Data4engthG ) 8 time8 )S.7F.HIS*O7M-M"IN9Wi!ard-7..G ) 8ms ..48 )

S.7F.HIS*O7M-M"IN9Wi!ard-..4G

IfFiacketsSent >G .hen iMinms .HIS*O7M-M"IN9Wi!ard-7..

1lse


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iMinms IIfFiMinms .HIS*O7M-M"IN9Wi!ard-7..,

.HIS*O7M-M"IN9Wi!ard-7.., iMinmsG

1ndIf iMa#ms IIfFiMa#ms P .HIS*O7M-M"IN9Wi!ard-7..,

.HIS*O7M-M"IN9Wi!ard-7.., iMa#msG

d(veragems FIIfFiackets7eceived >, .HIS*O7M-M"IN9Wi!ard-7..,d(veragemsG ) .HIS*O7M-M"IN9Wi!ard-7..G / =

1lse

iackets4ost iackets4ost ) > sData 81rrorQ 1rror num+erK 8 )

S.7F.HIS*O7M-M"IN9Wi!ard-4ast1rrorNum+erG ) 8 1rror DescriptionK 8 )

.HIS*O7M-M"IN9Wi!ard-4ast1rrorDescription

1ndIfsMSg smSg ) sdata ) ) chrF>YG

Ne#t

ifFipacketslost G then

dacketloss FFiackets4ostG / FiacketsSentGG >endif

smsg smsg ) chrF>YG ) 8ing statistics for 8 ).HIS*O7M-M"IN9Wi!ard-(ddress ) 8K8 ) chrF>YG

smsg smsg ) 8acketsK Sent 8 ) S.7FiacketsSentG ) 8, 7eceived 8 )

S.7Fiackets7eceivedG ) 8, 4ost 8 ) S.7Fiackets4ostG ) 8F8 ) S.7Fdacket4ossG )8T lossG,8 ) chrF>YG

smsg smsg ) 8(ppro#imate round trip times in milli2secondsK8 )

S.7Fd(veragemsG ) chrF>YG

smsg smsg ) 8 8 ) 8Minimum 8 ) S.7FiMinmsG ) 8ms, Ma#imum 8 )S.7FiMa#msG ) 8ms, (verage 8 ) FS.7Fd(veragemsGG ) 8ms8 ) ) chrF>YG

message&o#F sMsgG

Where can I find #ore infor#ation a%out in! Wi"ard?

More information can +e found at the product5s we+ linkK

httpK//www-seekfordsolutions-com/roducts/ingWi!ard/

Who is Seekford Solutions& Inc'?

Seekford Solutions, Inc- is a software development corporation speciali!ing in the design

and development of state of the art (ctive3 controls and custom proLects- .heir coreproduct line is focused on Internet technologies primaril" in the facilitation of the use of

the common Internet protocols- .he design philosoph" is +ased on ease of use and 0uickimplementation time- .he" also handle custom proLects for clients who are need of

specialt" software or who need a framework +ase to use- .he compan" was founded inearl" =>-

.heir we+site is httpK//www-seekfordsolutions-com/
http://www.seekfordsolutions.com/Products/PingWizard/http://www.seekfordsolutions.com/http://www.seekfordsolutions.com/Products/PingWizard/http://www.seekfordsolutions.com/

how can i monitor my server

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