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csma/cd is a protocol for multiple access first pick up a book on computer networks try understanding the algorithm them u can write the code in any language u want u can even implement it using digital logic gate alone provided u understand the protocol
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I've a wireless router with a very high range but the damn thing is that I want to reduce its range 'coz I do not want that someone break into my network and steal ma data.
Any idea guys ?
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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In the settings of some routers you can set transmit power from 100% down to something that covers your area. Don't forget to do this on clients using the WLAN too (though not all NICs support it...).
//Johannes
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gotcha...
Wireless LAN :: Advanced setting
Beacon Interval The Beacon Interval value indicates the frequency interval of the beacon. Enter a value between 20 and 1000. A beacon is a packet broadcast by the Router to synchronize the wireless network.
RTS Threshold The RTS (Request To Send) threshold (number of bytes) for enabling RTS/CTS handshake. Data with its frame size larger than this value will perform the RTS/CTS handshake. Setting this attribute to be larger than the maximum MSDU (MAC service data unit) size turns off the RTS/CTS handshake. Setting this attribute to zero turns on the RTS/CTS handshake. Enter a value between 0 and 2432.
Fragment Threshold The threshold (number of bytes) for the fragmentation boundary for directed messages. It is the maximum data fragment size that can be sent. Enter a value between 256 and 2432.
DTIM This value, between 1 and 255, indicates the interval of the Delivery Traffic Indication Message (DTIM).
802.11b/g
I didnt think that its inside my router...is that what I need ?
edit:
damn, I think this isnt what I needed. I just read some text in hurry 
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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That appears to only adjust how frequently a beacon packet is sent. Something to consider, as you reduce the power of your tranmitter the maximum speed your network will operate at will also go down. Faster signals require a higher signal to noise level (db) than slower ones, so as you reduce the size of your signal the SNR will drop and your performance will suffer as a result.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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then what should I do to reduce the range, my friend gave me advise once that If you place the aluminum or tin foil around the antenna then your range will boost up. But I want different.
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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Aluminum or tin foil is for building hats[^].
The only proper way to keep people out of your wireless network is to use encryption.
Most routers/gateways today support WPA or WPA2 which is good enough for normal usage.
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Wapping the antenna with foil to make an approximation of a parabolic dish (cantenna[^]) makes your signal more directional. ie you've got s much stringer signal and consequently greater range in the direction it's pointing and much less in any other direction. If you did this and aimed into the ground/sky you'd significantly reduce your power/range/speed in all horizontal directions. Removing/completely warping the antenna in foil would attenuate your signal in all directions.
If your router is compatible with them you could flash with the Tomato or DD-WRT firmwares which would give you control your transmission strength. What you can't do is to reduce your broadcast range without reducing your maximum speed; both of them are directly dependent on signal strength. Also, as long as you're using WPA2 encryption you've got nothing to worry about; you can't be hacked. If you're using WEP/idiot protection only (no SSID broadcast, MAC filtering); there's nothing you can do to stop someone from breaking into your network. WPA1 is currently inbetween, there's one known attack but it doesn't really let the attacker get in far enough to actually do anything other than earning "first WPA1 bragging rights".
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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dan neely wrote: Also, as long as you're using WPA2 encryption you've got nothing to worry about; you can't be hacked.
I'm using WPA 2 but I didn't forget an article where it was written that do not depend on this encryption. It can be cracked too. The way they told was just keep change the router UserName and Password and the Key. But that is BS. I want permanent solution. If there isnt any then I would like to use the wired router, at least better than fearing that someone is copying my data or sending bad mails using my net. Is that a bad idea ?
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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If you're paranoid enough not to trust an encryption scheme that's never been broken (excepting possible idiot password choices) then just throw your router and modem out and keep your PC's off the internet entirely. You're at far greater risk of being hacked over the internet while using a wired network. 
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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I call BS. WPA2 has not been cracked. The only known WPA1 exploit won't actually let the attacker do anything useful. Having an attacker enter your WPA2 network because he guessed that you used "password" (or anything else from the idiot list) as your PW doesn't count as breaking the system. If you use something like: "!uWP$2$dtib!apn!ltwptwifp" you're safe.
PS the "good" password is an encrypted message to you. 
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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dan neely wrote: WPA2 has not been cracked.
oh really...click me[^]
dan neely wrote: If you use something like: "!uWP$2$dtib!apn!ltwptwifp" you're safe.
I'm using more wierd than this one
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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Reducing the range is not a solution; that will badly affect the performance. A good solution is to encrypt the messages, but the stronger the encryption, the more the performance will suffer; it takes many CPU cycles to encrypt/decrypt the packets. A better solution it to filter out unwanted users by using MAC filtering. I know a MAC can be spoofed, but it's rare, and few people know how to do it.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Roger Wright wrote: few people know how to do it.
here few are everywheret thats why I thought to reduce the range. All I want is just reduce its radius to 30m from 100m.
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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Can you unscrew the antenna slightly?
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yes it was mine first try. But the manufacturer is very clever they fixed that in. No screw, no way to unplug the antenna until I break its warranty
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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Put the router in a metal box.
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hehehe  which metal ?
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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Any grounded metal box will serve as a Faraday cage and absorb 100% of the RF signal. This will reduce your range to the volume of the box.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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you mean if I put a grounded tin box on the antenna then the range will go down ?
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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You have to completely enclose the router and yes. The faraday cage will absorb 100% of the RF, NOTHING will get out. Your signal strength will be zero. It's all or nothing. I was being sarcastic.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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dan neely wrote: I was being sarcastic.
okay...but the thing you told looks good and I have a great idea if that works.
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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It won't. If it's not complete you'll just have all the power coming out directionally from where it's leaking.
PS the routers power cord and the cat6 running from the router to the modem will make it leak. 
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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what if I supply 6v instead 12. I'm sure it will die soon.
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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Roger Wright wrote: A better solution it to filter out unwanted users by using MAC filtering. I know a MAC can be spoofed, but it's rare, and few people know how to do it.
It's a feature in aircrack; so you're really not gaining anything over not broadcasting an SSID or only using WEP. Any of the three will keep your neighbors from connecting accidentally; none will stop a thief for more than a few seconds.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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