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How we can capture a tcp packet using java program

Actually capturing means to inspect the packets to find out any types of network attacks, and illegal access to sensitive files or devices

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Hi!

1. If you want to write a packet sniffer in java, please review this
useful links:
http://www.rohitab.com/discuss/lofiversion/index.php/t28724.html

jpcap:
http://netresearch.ics.uci.edu/kfujii/jpcap/doc/samples.html

I suggest to use the jpcap library it developed for packet capturing and it contains sample code too.



2. If you want to search for a simple exe program which captures
the ethenet packets wireshark is a good solution:
www.wireshark.org




Posted on Jan 07, 2009

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How to Make a Ping Utility on Windows NT Systems?


Helps in determining TCP/IP networks IP address as well as determine issues with the network and assists in resolving them. See the ping definition for a full description.
Pings the localhost. which helps determine if the computer can send information out and receive the information back from itself.
Note: The above command does not send information over network, but can indicate if the card can respond .
Ping supports the ability to ping an Internet address. In the above example, we pinged "computerhope.com" and as can be seen, received four responses back. If we couldn't reach the server or the server was blocking our request we would have lost all four packets .
Allows you to ping another computer where <69.72.169.241> can be the IP address of the computer you want to ping. If you do not get a reply or get lost packets you have a problem with your network, which can be a cable issues, network card issues, drivers. router. switch. or other network problem.

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Assessment cannot find my Cisco Packet Tracer Installation Directory. I Unable To Determine Cisco Packet Tracer Installation Directory The Packet Tracer Skills Assessment Player was unable to find


I had this same issue on Win-7 machines with 6.1.1 packet tracer. I had to install Java 7.67 32-bit for the browser(IE 11-32-bit even though these are 64 bit boxes) and then uninstall and re-install packet tracer to get the psta player to work. Just installing 32-bit Java did not solve the problem out right. Java 7.65 had issues with running plugins. I had a lab of 30 machines to do this on. I assume 6.1 needs the 32-bit version of Java to run (7.65 or 8.25 32-bit would not work) and this corrupted the install because the psta player did not load. After installing the Java and re-installing PT 6.1 the ptsa player would load and run. You will be prompted to update Java-choose "later"-run and continue when prompted.

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What is apn settings


Access Point Name (APN) is a computer protocol that typically allows a user's computer to access the internet using the mobile phone network.

On a technical level it is a configurable network identifier used by a mobile device when connecting to a GSM carrier. The carrier will then examine this identifier to determine what type of network connection should be created, for example: what IP addresses should be assigned to the wireless device, what security methods should be used, and how/or if, it should be connected to some private customer network.[1]

More specifically, the Access Point Name (APN) identifies an IP Packet Data Network (PDN), that a mobile data user wants to communicate with. In addition to identifying a PDN, an APN may also be used to define the type of service, (e.g. connection to wireless application protocol (WAP) server, multimedia messaging service (MMS)), that is provided by the PDN. APN is used in 3GPP data access networks, e.g. general packet radio service (GPRS), evolved packet core (EPC).

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1 Answer

Everytime i used internet it always appear a message "subscribe packet data first" it seems like somthin's missing in my settings. any thoughts? what should i do?


Note that "packet data" is the way that hand-held devices communicate over a cell-phone's network to pack an "envelope" around Internet data. So, talk to your cell-phone company about paying them a monthly fee to web-browse using your cell-phone.

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Plz send me the current status of contolling ip spoofing through inter domain packet filters


The current status is "operational" -- packet filtering is being used so that "outgoing" IP-addresses originating from a network are required to be IP-addresses that are valid within that network.

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1 Answer

How do i identify what data is being downloaded to me. My Line-Monitor graph shows incoming 27 bytes on ADSL 32/8 ( 256/64 ) and I have no download program running. Maybe it is a MS update - if so, how do...


You should specify what you mean by "identify what data is being downloaded."

If you are the techy-compu-geek type, then any simple "packet sniffing" program would work well for you. Just google "packet snniffer" and download one. Its mainly for the techy because most of the intercepted information would look like gibberish to the average user; it might most likely be in hex code.

if you are the average joe, then you can try a program like NetLimiter: http://www.netlimiter.com/.
it "shows list of all applications communicating over network it's connections, transfer rates and more".

Note: even though you may not have any download programs running, there may be other services running on your computer that may check stuff online periodically.

If the netlimiter program finds a program with a name that you are not familiar with (as is most often the case), an easy way to see if its a virus or a legitimate service is by simply googling the name.
Hope this works

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1 Answer

Pinging problem


in the cmd prompt try 127.0.0.1 enter
unplug ur network cable and then try

ping 127.0.0.1

if u r getting 4 packets and there is no packet loss then ur network card is ok. Else replace network cards

Feb 05, 2009 | Microsoft Windows XP Professional With...

1 Answer

Conversion of SNMP to TCP/IP packet


Hi!


I suggest the following:
Install a packet analyzer to the target machine.
This program helps you observe and analyze the network traffic real time. It is helpful for debug the network packets, look inside how the frames is structured. The Wireshark is quite popular debugger tool. Install it and check TCP/IP and SNMP packets with it.
Here is it:
http://www.wireshark.org/download.html

Second:
There is a lot of information on the internet about the SNMP freame formats and TCP/IP protocol.
Here are some useful links:
http://www.tcpipguide.com/free/t_SNMPMessageFieldDefinitionsGeneralMessageFormatand.htm
http://www.dpstele.com/layers/l2/snmp_l2_tut_part1.php
http://www.rane.com/note161.html
A lot of RFC documents write down the SNMP protocol.

Here are somple helpful VC++ programs:
https://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=7949&lngWId=3

I suggest using free tools to test your network device:
http://manageengine.adventnet.com/products/oputils/free-snmp-tools.html









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1 Answer

Multikey secure multimedia proxy using ARPS-java source code


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1 Answer

Wireshark


NOT TOO CLEAR TO MY TEAM

source:
solution dictionary for fixing all pc problems on htpp://www.tinyurl.com/52mwor
http://www.digitalpowering.blogspot.com

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