Logging DSL downtime using SNMP.. HELP!!!!
Our office has been having a ton of short lived DSL outages which is causing havoc for our developers. The general manager has asked me to write a tool to monitor our internet connection and log whenever the DSL goes down and how long the outage lasts. The outages vary from 5 sec to 2 min. Just long enough to cancel an FTP or bomb a remote desktop session.
At first I thought I'd simply write a module that would ping a standard website (google) every second or two and log the result. But it seems there should be a more accurate way. I've been looking into SNMP and using an api for that. It seems that it may be the right approach if I could just figure out how to decifer the MIB. It's not looking good.
So I am hoping I might can get some help.
What is the most accurate way for a java module to determine if there is a healthy connection to the internet at the DSL Router? (From a machine on the inside of the network.) I'd like to be able to hit it a maximum of every 5 seconds and get a quick response without tying up network resources with something like a ping.
I have Googled this until I am totally out of ideas just to figure out what to search for. I get a lot of info on SNMP and Java APIs but none of the documentation is straight forward enough that I could say that I can figure out exactly what to run and what results to expect. And MIB documentation is scary!!!!
So far I have been able to write a test module that will access the router and grab the entire MIB table and then dump it. But the data is just too abstract to identify anything from it.
HELP!!!
Glenn Puckett
MetaMAP, Inc.
Lexington, KY
That is the reason for the monitor. Our ISP only
claims to log outages of 60 seconds or more. So
they only acknowledge one or two outages per day.
However we are having a minimum of 15 to 20 outages
of 30 seconds or less every day. Which are causing
us lots of problems. We need to try to monitor the
actual outages so we can address the issue with our
ISP.
I would encourage you to work directly with your iSP to resolve the situation. Or get a new ISP. Or hire a network specialist to work on your problem along with your ISP. Or a combination of all this.
Here's why
1) I don't know about logging "outages" but I would be shocked if they don't have log of connections or reconnections. All ISPs I have worked with have such a log. What you descibe as "outages" they may mean by some sort of line fault where the line noise goes over a certain threshold.
2) line noise is not usually the problem in my experience when people have intermittent connection problems. Most commonly there is a hardware problem on your end, faulty modem or fault gateway router. As in a modem that starts spewing garbage down the line or a router that goes awry (several ways this can happen).
3) Regardless the monitoring program is unneccessary because the router should have a way of logging re-connections.
Anyway. I don't doubt you are having a problem, sometimes they happen, I just believe that you would be better served trying to solve it another way. Again a networking specialist would be able to help you out far quicker and more effectively.
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Hi,
I'm trying to use the snmp agent of WLS 5.1 to monitor
the server, the database pool and the servlets but all i can
see when using a browser is the jdbcPoolTable and serverTable.
Is there any way to see information about the servletes?
Am I doing something wrong or is it the agent, and if so what can I
do to change it?
AmosServlet Information is not supported through the SNMP agent, yet.
Angelovici Amos <[email protected]> wrote in message
news:8hl6f3$phf$[email protected]..
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Amos -
Help needed on Logging Servlet Implementation using high traffic HTTP Post
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Can I replace the Servlet with JSP to do the logging and will that solve my sequence issue?
Or there are any other techniques.
Thanking you in advance.You could use the log4j logging tool, it uses a static Logger for the class and you can run it in synchronized mode to ensure that your log messages don't clobber each other. Hmm, you're testing my knowledge of how synchronization is implemented in Java. It uses a semaphore-style approach under the covers, but is it a fair-style (first-come, first-served) implementation?
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Collecting information from Cisco switchs using SNMP
Dear All,
I have a wide network with more than 250 sites connected using the DSL. the WAN devices are under the provider responsability and the LAN devices are directly in my responsability. In each site, I have :
1 or 2 Cisco switchs (2960 or 3560), connecting via fibr.
or
Linksys switch connected via ethernet cable
and
cisco 877 router connected to switch
cisco 881G router conected to switch
pc and printers
In order to improve the availibilty of our network, we lauch every day a script from local pc to test connectivity of LAN equipements :
ping to switchs (Vlan 1), ping to ip fa0/0 cisco router1, ip cisco router2, ping to HSRP address (of two router). the resulting ini file will be inserted in a database and exported to excel for analysing.
I'm asking if someone can help in order to implement SNMP and let me know the name of cisco MIB to implement to :
- to have from SNMP information, the result of show cdp nei, show interface status, show ip int brief,...
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- others usefuls informations.
Thanks and regards,
AAHi,
the basic SNMP config for 2960 and 3560 is:
snmp-server community <> RO
The configuration for SNMP traps to get alerts from the device if there is for example a failure with a fan is:
snmp-server enable traps
snmp-server host <> <>
This enables all traps available with your IOS version. You can the disable not wanted traps by using the "no"-command like this.
Example for dot1x traps:
no snmp-server enable traps dot1x
With a snmp client you can then do a snmpwalk (or snmp get) without a specific OID to get all the SNMP information from the device:
On a Linux server the following command should work:
snmpwalk -v 2c -c <> -T <>
-v = use SNMP version 2c
-c = use the community string you configured on the device
-T = output in the dotted decimal format
But be careful, this will be a lot of data output.
Here you will find a docu for configuring SNMP on a Cisco device:
http://www.cisco.com/en/US/docs/ios/12_2/configfun/configuration/guide/fcf014.html
Sven -
Open Text Content Server Monitoring Agent 5.0 with SCOM using SNMP
Hi All
Got a requirement to integrate Opentext monitoring agent with SCOM 2012.
Can we use SNMP to forward the alerts to SCOM console ? or can we directly monitor opentext content server with some MP's ?
Regards
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Cheers,
Patrick
Please remember to click “Mark as Answer” on the post that helped you.
Patrick Seidl (System Center and Private Cloud)
Website: http://www.syliance.com
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Hi,
I already ask in the forum Advanced Language Topics
http://forum.java.sun.com/thread.jsp?forum=4&thread=320674
but I din't receive any answer so I try here maybe some one could help me on this ... ;-)
I find a nice piece of code on Internet to do SNMP request �
http://membres.lycos.fr/ysoun/index.html
http://membres.lycos.fr/ysoun/sck.zip
It works find to do some GET operations like doing a GET sysDescr (oid 1.3.6.1.2.1.1.1.0).
But I would like to do a SET operation but I could'nt succeed.
First I do a get on an oid 1.3.6.1.2.1.1.4.0 (sysContact) and I get the value "hello" which is find and I would like to set this value to "good bye".
Well I have to say that I don�t know very well the SNMP protocol and I couldn�t figure out where to put the value in order to set "Good bye". Off course I have the right community to do that but I just can't figure out how can I do that ...
Any comment ... help ... ideas ... are more than welcome !!!! Or maybe some better SNMP package to do that???
thanks,
Emmanuel
Here is the code:
the function to set using SNMP ...
public static setSnmpRequest(int snmpPort, int snmpTimeout, String community, String host, String strValue){
String oid = new String("1.3.6.1.2.1.1.4.0");
D_SNMP.Message request;
try {
InetAddress snmpHost = InetAddress.getByName(host);
DatagramSocket sock = new DatagramSocket();
sock.setSoTimeout(snmpTimeout);
// create pdu.
//somewhere here I should include my variable "good bye" but I don't really know how
Var var = new Var(oid);
OctetString c = new OctetString(community);
D_SNMP.Integer requestId = new D_SNMP.Integer(0);
D_SNMP.Integer errorIndex = new D_SNMP.Integer(0);
D_SNMP.Integer errorStatus = new D_SNMP.Integer(0);
//For the GET:
//PduCmd pdu = new PduCmd(Pdu.GET,requestId,errorStatus,errorIndex,new VarList(var));
//What I would like to do:
PduCmd pdu = new PduCmd(Pdu.SET,requestId,errorStatus,errorIndex,new VarList(var));
D_SNMP.Message m = new D_SNMP.Message(c,pdu);
// send
byte[] b = m.codeBer();
DatagramPacket packet = new DatagramPacket(b,b.length,snmpHost,snmpPort);
byte[] b2 = new byte[1024];
DatagramPacket p2 = new DatagramPacket(b2,b2.length);
long startTime = System.currentTimeMillis();
sock.send(packet);
sock.receive(p2); // block or ... timeout.
long time = (System.currentTimeMillis() - startTime);
// display
ByteArrayInputStream ber = new ByteArrayInputStream(b2,1,p2.getLength()-1); // without tag !
D_SNMP.Message m2 = new D_SNMP.Message(ber);
System.out.println("snmpPing " + host + " :");
System.out.println(m2.getPdu().getVarList().elementAt(0) + " / time = " + time + "ms" );
if (debug){
StringBuffer buf = new StringBuffer();
m2.println("",buf);
System.out.println(buf);
} catch (UnknownHostException ex){
System.out.println(host + ": unknown host." );
} catch (InterruptedIOException ex){
System.out.println("snmpPing "+ host + " : Time-out." );
} catch ( Exception ex) {
System.out.println("Error in : ");
System.out.println(ex);
} the class Var... where somewhere I should be able to set the variable "Good bye" ...
import java.io.*;
import java.util.Vector;
/** ASN.1 grammar for Var:
* Var ::=
* SEQUENCE
* { name Oid
* value CHOICE {Null, Integer, Counter, gauge, Timeticks, IpAddress, OctetString}
final public class Var extends construct implements Serializable {
public Var(Oid o, smi s){
this();
valeur.addElement(o);
valeur.addElement(s);
/** Same as Var(new Oid(oid), new Null()).
public Var(String oid) throws IOException{
this(new Oid(oid), new D_SNMP.Null());
/** Builds a Var from a ByteArrayInputStream holding a Var Ber coding.
* <BR>Bytes read are removed from the stream.
* <P><B>Note:</B> The ByteArrayInputStream must not contain the Var Tag.
* @exception IOException is thrown if a problem occurs while trying to decode the stream.
public Var(ByteArrayInputStream inBer) throws IOException{
this();
decodeBer(inBer);
/** Used only by VarList.
Var(){
super(smi.SEQUENCE_tag);
valeur = new Vector(2);
/** Returns the name of this Var.
public Oid getName(){
return (Oid) valeur.elementAt(0);
/** Returns the value of this Var.
public smi getValue(){
return (smi) valeur.elementAt(1);
/** Returns the value of this Var as a String.
public String toString() {
try{
return ((smi)valeur.elementAt(0)).toString() + " = " + ((smi)valeur.elementAt(1)).toString();
}catch (IndexOutOfBoundsException e) { // ne doit pas se produire.
System.out.println("Erreur codage interne type Var.");
System.exit(1);
return null;
/** Used smi.decodeBer().
void decodeValeur(ByteArrayInputStream bufferBer, int lgBerValeur) throws IOException {
int tag = bufferBer.read();
if ( tag != smi.OID_tag )
throw new IOException ("erreur decodage tag Oid de Var: byte " + java.lang.Integer.toHexString(tag) +" recu.");
Oid name = new Oid(bufferBer);
this.valeur.addElement(name);
// lis l'objet suivant.
tag = bufferBer.read();
try{
smi _valeur = smiFactory.create(tag,bufferBer);
this.valeur.addElement(_valeur);
} catch (IOException e){
throw new IOException ("erreur decodage champ Valeur : " + e);
/** Custom serialization: Ber coding is written in ObjectOutputStream.
private void writeObject(ObjectOutputStream out) throws IOException{
byte b[] = this.codeBer();
out.writeInt(b.length);
out.write(b);
out.flush();
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
this._tag = smi.SEQUENCE_tag;
this.valeur = new Vector();
int len = in.readInt();
byte b[] = new byte[len];
in.readFully(b);
this.decodeBer(new ByteArrayInputStream(b,1,b.length-1));
} the class VarList ...
import java.io.*;
import java.util.Vector;
/** ASN.1 grammar for VarList:
* VarList ::=
* SEQUENCE OF Var
final public class VarList extends construct {
/** Constructs a VarList holding a single Var.
* @param Var to be held by Varlist
public VarList(Var v){
super(smi.SEQUENCE_tag);
valeur = new Vector(1);
valeur.addElement(v);
/** Constructs a VarList holding Vars.
* @param v Vector of Vars.
public VarList(Vector v){
super(smi.SEQUENCE_tag);
valeur = (Vector) v.clone();
/** Constructs a VarList holding Vars.
* @param tab array of Vars.
public VarList(Var[] tab){
super(smi.SEQUENCE_tag);
int taille = tab.length;
valeur = new Vector(taille);
for (int i=0; i<taille; i++)
valeur.addElement(tab);
/** Builds a VarList from a ByteArrayInputStream holding a VarList Ber coding.
* <BR>Bytes read are removed from the stream.
* <P><B>Note:</B> The ByteArrayInputStream must not contain the Var Tag.
* @exception IOException is thrown if a problem occurs while trying to decode the stream.
public VarList(ByteArrayInputStream inBer) throws IOException{
super(smi.SEQUENCE_tag);
valeur = new Vector();
decodeBer(inBer);
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public Var elementAt(int i) throws IndexOutOfBoundsException {
return (Var)valeur.elementAt(i); // Sans soucis: Var est immutable
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public int getSize(){
return valeur.size();
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* A VarList is in fact an array of Vars.
void decodeValeur(ByteArrayInputStream bufferBer, int lgBerValeur) throws IOException {
Var v;
int lg;
try{
while (lgBerValeur >0){
int tag = bufferBer.read();
lgBerValeur --;
if ( tag != smi.SEQUENCE_tag )
throw new IOException ("error decoding tag Var in VarList: byte " +
java.lang.Integer.toHexString(tag) +" read.");
v =new Var();
lg = v.decodeBer(bufferBer);
this.valeur.addElement(v);
lgBerValeur -= lg;
} catch (IOException e){
throw new IOException ("error decoding Value : " + e);I read the documentation it does not help me much, (it's generated by javadoc and there is not enought comment to understand the whole thing ... in fact it just miss a sample of SET request and it would be perfect ...
thanks,
emmanuel
PS: I'm going to try the author again
PS: Still ... any help or pakage to do SET request using SNMP are more than welcome ... -
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HI,
I am using cisco catalust 3560-x series swtiches. And I am new to SNMP. I want to assign IP address to interfaces of this switch, using SNMP. Kindly help me. Any help, any sugession, is most welcome.
Thanks in advance
Jeni Ahi,
Thanks for your response.
Our requirement is as follows.
I want to assign IP address to Switch fro my Java Application. I have implemented a Telnet Client Code in Java, by which i can configure IP address in switch from my java application.
But my boss said, Telnet is not secure and try using SNMP to do the same.
When I was searching in Internet, I got this page https://supportforums.cisco.com/discussion/12090896/snmp-how-get-list-ip-addresses-and-corresponding-interface-names
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I would then set the ip-helper address, on the port the wireless access point is connected to on the Cisco, to point to the DHCP server.
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In my config, I cannot tell if DHCP is enabled or not, I can see neither "service dhcp", nor "no service dhcp" in the config.
Assuming I were to turn it on using "service dhcp", can I then leave the actual functionality turned off? i.e. turn on the DHCP service, but not have it assign IP addresses?
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conf t
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Ip dhcp relay information option subscriber-id “wireless”
I know these are probably simple questions, so please forgive my ignorance.
JamesOk here goes.
On my domain controller/DHCP server, I have a scope setup of 10.0.0.0 255.255.0.0, and is set with an IP range of 10.0.0.1 - 10.0.6.253
I have various reservations in place, and a working policy to assign thin clients an IP of 10.0.2.X based on their MAC address.
I have then created a second policy, that should be assigning IPs in the 10.0.6.0 range, based on relay agent information, subscriber ID. This is a HEX value, so whatever string I enter on the Cisco, has to be converted to HEX.
This DHCP server is on the same VLAN 3. The VLAN interface on the Cisco has IP of 10.0.0.254 255.255.0.0
The wireless clients are getting IP addresses, but not within the range specified by the policy, so they are getting any address between 10.0.0.1 and 10.0.6.253 that is not already in use.
Image 1 shows the vlan interface, where I have set the helper address, relay information option-insert, and subscriber id of "wireless".
Image 2 shows the config on the port that my access point is connected to.
Image 3 shows the value of the policy on the DHCP server, based on subscriber ID
Image 4 shows the string "wireless" converted to HEX
Image 5 shows the IP range that the policy should be using
Image 6 shows "Edss-iPhone" as have an IP not within the correct range
Hopefully that helps. -
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ADAPT01229385
Description:
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I got a Nexus 7000 supervisor module recently, I met a SNMP problem for this module
I would like to know which specific OIDs to use to monitor the following using SNMP on a Nexus 7000 supervisor module:
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port status OID is ifOperStatus
CPU total utilization OID is 1.3.6.1.4.1.9.9.109.1.1.1.1.6.1
[root@NET-MONITOR-1 ~]#
[root@NET-MONITOR-1 ~]# snmpwalk -On -v 2c -c 360buy 172.17.0.253 ifDescr.83886080
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[root@NET-MONITOR-1 ~]#
[root@NET-MONITOR-1 ~]# snmpwalk -On -v 2c -c 360buy 172.17.0.253 ifOperStatus.83886080
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[root@NET-MONITOR-1 ~]#
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Can I boost the DSL signal using my 1st Generation Airport Extreme or Express?
I just moved into a house where they have ATT DSL and it is really slow in my room. I am hoping that I don't have to purchase a booster and I might be able to use my Airport Extreme or Express to boost it. I don't think they want my Extreme as their router, though. They are PC.
I am also hoping that I can set up a wireless printing situation in my room using the Express or Extreme.
I am running 10.4.11 on my old MacBook Pro laptop, 10.5.something on my old desktop (MacMini).
Thanks for any help ahead of time,
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I just moved into a house where they have ATT DSL and it is really slow in my room. I am hoping that I don't have to purchase a booster and I might be able to use my Airport Extreme or Express to boost it.
Unfortunately, this won't work especially if you want the connection between the routers to be wireless. The two are just not compatible for configuring an extended network. However, it could work if you can have them interconnected by wire. In that case, you could configure them into a roaming network.
I don't think they want my Extreme as their router, though. They are PC.
This shouldn't be an issue as the AirPorts support wireless clients regardless of which operating system they are running. -
Hi All,
Can anybody tell me how to use SNMP Agent to monitor the Access and Identity ServersHi Ramesh,
I cannot comment on WebLogic & SNMP - this kind of questions would
probably need to be asked on a WebLogic forum.
If you're looking for an SNMP Manager API though, you may want to have a
look at the Java Dynamic Management Kit (commercial product,
free evaluation):
http://java.sun.com/products/jdmk/index.jsp
Hope this helps,
-- daniel
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http://blogs.sun.com/jmxetc
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Updating an existing xml file in java
Hi, i need to update an existing xml file with new nodes. But i don.t know how to do that. i can read and write a new xml file . But updaton seems too difficult for me. my xml structure is like this <main_node> <node1> <name> name1</name1> <id>ID</id
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Problem when create the BP number through PCUI
Hi Experts, we are working on CRM 5.0 & EP7.0 i have created custom function module (z function module) for generate the customs BP number( Dep country ,region) for BP t-code in GUI (CRM) System , when test throu
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Is there a way to run/debug a VI, with GPIB commands, on a computer without a GPIB card? We have a limited number of computers connected to instruments with GPIB. I want to debug the VI at my desk with no GPIB. Thanks in advance, Mark Getbehead Sent