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Full Discussion: simple script to alert if internet not working?
Top Forums Shell Programming and Scripting simple script to alert if internet not working? Post 302429246 by fuzzylogic25 on Sunday 13th of June 2010 10:01:59 PM
Old 06-13-2010
simple script to alert if internet not working?
Hi,

I am constantly automaticaly downloading a few things on the internet but since my internet connection is unstable, it sometimes wont work. Thing is the internet will appear to be connected, but no website can be accessed and no program can successfully connect to any location. I can fix this issue once detected by turning adsl modem off and on.

So I want to write a program that detects this. So say, every 5 minutes, checks to see if internet works. I was thinking it would prob just run something like "ping www.google.com" every 5mins and if it doesnt work (ie if it cant get any information from google), it will run some file (like a mp3, to alert me).

Problem is ping keeps gettin data requests nonstop from looks of it. so how would i go about doing this? i have never done shell scripting so i dont really know how? if anyone could help me with a solution that would be great. I am using cygwin under win xp.
 

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LEARN ABOUT OSX

snmptranslate

SNMPTRANSLATE(1)						     Net-SNMP							  SNMPTRANSLATE(1)

NAME

       snmptranslate - translate MIB OID names between numeric and textual forms

SYNOPSIS

       snmptranslate [OPTIONS] OID [OID]...

DESCRIPTION

       snmptranslate  is  an  application that translates one or more SNMP object identifier values from their symbolic (textual) forms into their
       numerical forms (or vice versa).

       OID is either a numeric or textual object identifier.

OPTIONS

       -D[TOKEN[,...]]
	       Turn on debugging output for the given TOKEN(s).  Try ALL for extremely verbose output.

       -h      Display a brief usage message and then exit.

       -m MIBLIST
	       Specifies a colon separated list of MIB modules to load for this application.  This overrides the environment variable MIBS.

	       The special keyword ALL is used to specify all modules in all directories when searching for MIB files.	Every file whose name does
	       not begin with "." will be parsed as if it were a MIB file.

       -M DIRLIST
	       Specifies a colon separated list of directories to search for MIBs.  This overrides the environment variable MIBDIRS.

       -T TRANSOPTS
	       Provides control over the translation of the OID values.  The following TRANSOPTS are available:

	       -Td   Print full details of the specified OID.

	       -Tp   Print a graphical tree, rooted at the specified OID.

	       -Ta   Dump the loaded MIB in a trivial form.

	       -Tl   Dump a labeled form of all objects.

	       -To   Dump a numeric form of all objects.

	       -Ts   Dump a symbolic form of all objects.

	       -Tt   Dump a tree form of the loaded MIBs (mostly useful for debugging).

	       -Tz   Dump a numeric and labeled form of all objects (compatible with MIB2SCHEMA format).

       -V      Display version information for the application and then exit.

       -w WIDTH
	       Specifies the width of -Tp and -Td output. The default is very large.

       In  addition  to  the  above options, snmptranslate takes the OID input (-I), MIB parsing (-M) and OID output (-O) options described in the
       INPUT OPTIONS, MIB PARSING OPTIONS and OUTPUT OPTIONS sections of the snmpcmd(1) manual page.

EXAMPLES

       o   snmptranslate -On -IR sysDescr
	   will translate "sysDescr" to a more qualified form:

	   system.sysDescr

       o   snmptranslate -Onf -IR sysDescr
	   will translate "sysDecr" to:

	   .iso.org.dod.internet.mgmt.mib-2.system.sysDescr

       o   snmptranslate -Td -OS system.sysDescr
	   will translate "sysDecr" into:

	   SNMPv2-MIB::sysDescr
	   sysDescr OBJECT-TYPE
	     -- FROM SNMPv2-MIB
	     -- TEXTUAL CONVENTION DisplayString
	     SYNTAX OCTET STRING (0..255)
	     DISPLAY-HINT "255a"
	     MAX-ACCESS read-only
	     STATUS current
	     DESCRIPTION "A textual description of the entity. This
			  value should include the full name and
			  version identification of the system's
			  hardware type, software operating-system,
			  and networking software."
	   ::= { iso(1) org(3) dod(6) internet(1) mgmt(2) mib-2(1) system(1) 1 }

       o   snmptranslate -Tp -OS system
	   will print the following tree:

	   +--system(1)
	      |
	      +-- -R-- String	 sysDescr(1)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -R-- ObjID	 sysObjectID(2)
	      +-- -R-- TimeTicks sysUpTime(3)
	      +-- -RW- String	 sysContact(4)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -RW- String	 sysName(5)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -RW- String	 sysLocation(6)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -R-- Integer	 sysServices(7)
	      +-- -R-- TimeTicks sysORLastChange(8)
	      |        Textual Convention: TimeStamp
	      |
	      +--sysORTable(9)
		 |
		 +--sysOREntry(1)
		    |
		    +-- ---- Integer   sysORIndex(1)
		    +-- -R-- ObjID     sysORID(2)
		    +-- -R-- String    sysORDescr(3)
		    |	     Textual Convention: DisplayString
		    |	     Size: 0..255
		    +-- -R-- TimeTicks sysORUpTime(4)
			     Textual Convention: TimeStamp

       o   snmptranslate -Ta | head
	   will produce the following dump:

	   dump DEFINITIONS ::= BEGIN
	   org ::= { iso 3 }
	   dod ::= { org 6 }
	   internet ::= { dod 1 }
	   directory ::= { internet 1 }
	   mgmt ::= { internet 2 }
	   experimental ::= { internet 3 }
	   private ::= { internet 4 }
	   security ::= { internet 5 }
	   snmpV2 ::= { internet 6 }

       o   snmptranslate -Tl | head
	   will produce the following dump:

	   .iso(1).org(3)
	   .iso(1).org(3).dod(6)
	   .iso(1).org(3).dod(6).internet(1)
	   .iso(1).org(3).dod(6).internet(1).directory(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysDescr(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysObjectID(2)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysUpTime(3)

       o   snmptranslate -To | head
	   will produce the following dump

	   .1.3
	   .1.3.6
	   .1.3.6.1
	   .1.3.6.1.1
	   .1.3.6.1.2
	   .1.3.6.1.2.1
	   .1.3.6.1.2.1.1
	   .1.3.6.1.2.1.1.1
	   .1.3.6.1.2.1.1.2
	   .1.3.6.1.2.1.1.3

       o   snmptranslate -Ts | head
	   will produce the following dump

	   .iso.org
	   .iso.org.dod
	   .iso.org.dod.internet
	   .iso.org.dod.internet.directory
	   .iso.org.dod.internet.mgmt
	   .iso.org.dod.internet.mgmt.mib-2
	   .iso.org.dod.internet.mgmt.mib-2.system
	   .iso.org.dod.internet.mgmt.mib-2.system.sysDescr
	   .iso.org.dod.internet.mgmt.mib-2.system.sysObjectID
	   .iso.org.dod.internet.mgmt.mib-2.system.sysUpTime

       o   snmptranslate -Tt | head
	   will produce the following dump

	     org(3) type=0
	       dod(6) type=0
		 internet(1) type=0
		   directory(1) type=0
		   mgmt(2) type=0
		     mib-2(1) type=0
		       system(1) type=0
			 sysDescr(1) type=2 tc=4 hint=255a
			 sysObjectID(2) type=1
			 sysUpTime(3) type=8

SEE ALSO

       snmpcmd(1), variables(5), RFC 2578-2580.

V5.6								    20 Jul 2010 						  SNMPTRANSLATE(1)
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