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Packet capture whats the best wireless network adapter can i use for my laptop,,in capturing packets..

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You can go with any G or higher series adaptor with an antenna, I have brought a very cheap usb wireless network adaptor without anteena and modified it by attaching a reflector and antenna which has drastically improved the signal gain and range.

Posted on Oct 08, 2009

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Posted on Jan 02, 2017

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Why Addresses in the IP Address Pool on a Switch Are Exhausted When the Switch Functions as a DHCP Server and It Has a Few Clients?


If the IP address pool has much more resources than needs of clients, the following two reasons may cause address exhaustion:
1. An attacker keeps changing the CHADDR field and sending DHCP Discover packets to exhaust addresses. If so, contact Huawei engineers to deploy DHCP snooping to protect the IP address pool.
2. The DHCP server ping function is enabled on the DHCP server. This function tries to ping the allocated addresses before responding to DHCP Offer packets. If a client responds to any ping packet, the DHCP server considers that there are address conflicts and addresses are exhausted. To solve this problem, two methods are available:
1. Capture packets on the ports connected to the DHCP server. If a client responds to ping packets, prohibit the client.
2. Disable the DHCP server ping function using the undo dhcp server ping packet command.
3. Such as S5700, S6700

Aug 01, 2016 | Computers & Internet

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Can a wifi wep key be cracked? if yes HOW ?


Yes WEP can be cracked.

You need to install a sniffer tool on you Laptop and then you need to capture the packets.
Once you cpature the packets filter the packets using the access Point IP

Then by looking at the transactions between the wireless AP and the laptop you can get the WEP key.

Its not that simple, need a lot of expertise.

Dec 06, 2010 | Computers & Internet

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Catch packet on motorola sb5100e cable modem


Not sure exactly what you are trying to accomplish but WireShark works well at capturing any network traffic.

Apr 12, 2010 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

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Though this is called a 'hub' it appears to actually be a switch as I cant packet capture traffic of other connected devices. Am I right about it being a switch? linksys etherfast efah08w 8x10 100 mbps


Despite the fact that the product bills itself as a "hub" in the product description Linksys mentions "Internal store-and-forward switching for effective traffic reduction" which is only used in switch gear.

I think you have a switch on your hands. Otherwise, you may have a problem with your packet capture software.

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How we can capture a tcp packet using java program


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




Jan 06, 2009 | Computers & Internet

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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2 Answers

Connecting wireless


Based on the category you picked I need to ask if you want to connect a wireless adapter in a computer to the one wireless router you have or do you have such a large area that you need two wireless routers to cover the space. They are two very different issues. Please add a comment to this issue if you really have two routers -- it is a different problem than the one I will describe.

Assuming the picture of the device is right and it is another wireless adapter you need to connect to the router.-- the simple answer is basically the same as the ones before which is probably not helpful now. (Assuming the wireless adapter is installed and the drivers loaded.) Then if you have an secure network (where WEP or WPA was enabled) you probably will need to connect to the specific network using your adapters manufacturer's software or Windows Wireless Zero Configuration where you will probably need to supply a network name (SSID) and the passphrase that was configured inro the router. If you have an unsecured network your adapter may work without configuration. There is one other possible issue -- most routers dynamically assign ip address and other information to the adapters. If your router was not configured to supply all information including DNS addresses we may have some additional configuration to apply to the wireless adapter.

Please respond if these steps are two complex so I can provide additional information. Please provide the manufacturer and model of the wireless router and wireless adapter if that is the case so I can provide more detailed information specific to your hardware.

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Communication problems over IP phone


I have found many possible causes. Firmware Levels Outdated firmware in routers, VOIP phones, Firewalls, etc. can cause one-way audio. Ensure you have the latest updates for all the devices in the call path. Configuration Particularly if NAT is involved in the call path, configuration of the various devices may be a problem. Check to see if all devices are configured appropiately for your envioronment. Has anything changed, carriers harware, quos settings on router ? packet loss to these locations should be tested @ time it happens most, don't use it as gospel retur, ttl and re-xmits' do same.. Bob Finding the Cause The basic troubleshooting technique is to use a tool like Ethereal to capture SIP and RTP packets at each point in the call path where packets could be lost. Interperting the resulting captured packets requires some familarity with how networking and VOIP work. For example if the call path is: VOIP phone/device ---- firewall ---- sip proxy ---- firewall ---- asterisk Troubleshooting Steps Start capturing at point Make a VOIP call that will have one-way audio Analyze capture If problem found, fix and retest Otherwise move capture point to the next point (a, b, c, d, etc) and start over If the problem is intermittent, then a long term simultanous capture at multiple points can be used to attempt to capture a comple call with the problem. Most capture tools will let you capture only traffic from selected devices, so the volume of captured information can be kept to a reasonable size. If a back-to-back SIP user agent (for example a Session Border Controller ) is part of of the call path, then it may be necessary to capture all VOIP traffic at some points to ensure catching the wanted call since the IP addresses can change when traversing this device. Resources How To Debug and Troubleshoot VOIP

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