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Topic: Knocking-in

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Engine knocking - Wikipedia, the free encyclopedia A knock sensor consists of a small piezoelectric microphone on the engine block, connected to the engine's electronic control unit. Modern automotive and small-boat engines have sensors that can detect knock and delay the spark plug firing to prevent it, allowing engines to safely use petrol of lower octane ratings, with the consequence of reduced power and efficiency. It is caused by an instantaneous ignition of the remaining fuel/air mixture in the form of an explosion. en.wikipedia.org /wiki/Engine_knocking   (548 words)

PORTKNOCKING - A system for stealthy authentication across closed ports. : ABOUT : summary Port knocking is used to keep all ports closed to public traffic while flexibly opening and closing ports to traffic from users who have authenticated themselves with a knock sequence. Recently, the use of port knocking and OS fingerprinting (fwknop) was presented at DEF CON 12 and discussed on Slashdot. Port knocking was the subject of long Slashdot debate. www.portknocking.org   (1194 words)

AAA : Your Car : I hear a knocking noise in my engine. Should I be concerned? There are knocking noises that are not as critical, but the difference between a noise that is a major problem and a noise that is a minor problem is so subtle that only a trained professional technician can tell the difference. Knocking noises are usually caused by two parts banging against each other that shouldn't bang together. AAA : Your Car : I hear a knocking noise in my engine. www.csaa.com /global/faqdetail/0,1397,1004010401214,00.html   (245 words)

Engine knocking Knocking can typically be prevented by higher octane gasoline, reduction of in cylinder temperature (cooling or compression reduction), or the addition of "lead" to the gasoline. Knocking or pinging in internal combustion engines occurs when the fuel ignites before the spark occurs at maximum compression. To the driver, knocking can be detected as "knocking" or "pinging" noise during hard acceleration. www.eurofreehost.com /en/Engine_knocking.html   (160 words)

Howstuffworks "What does octane mean?" When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. auto.howstuffworks.com /question90.htm   (606 words)

J!NX Forums - Port Knocking Port knocking is setup on an individual basis, and an admin picks the combination for each port he wants to be able to knock open. If you try to knock on them, all you're going to do is set off the alerts in them, and most likely get your IP banned from the system entirely. You have 131,072 possible combinations for each of the 3 knocks. www.jinx.com /forum/topic.asp?TOPIC_ID=28284   (581 words)

Engine Knocking (Service Dept, Aug 03) As you said, the engine was recently rebuilt by Lou down in Milwaukee. It is most certain that after an engine rebuild you have to do this once, if not twice, to get the head to seat properly. In the old days, engine manufacturers allowed you to mix a small amount of water into the top end of our engine through a control valve. www.acbs-bslol.com /Gadgets/Knocking.htm   (1178 words)

KNOCKING - Definition Hearing knocking in your dreams, suggests that your unconscious is trying to attract your attention to some aspect of yourself or to some waking situation. repeated knockings of the head upon the ground by the Chinese worshiper. [n] the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder" www.hyperdictionary.com /dictionary/knocking   (72 words)

Port Knocking Linux Journal Port knocking does not require any open ports, and it can be extended to transmit any type of information encoded in a port sequence. Port knocking is a stealthy authentication system that employs closed ports to carry out identification of trusted users. In order to use port knocking, a number of ports need to be allocated for exclusive use by this system. www.linuxjournal.com /article.php?sid=6811   (3992 words)

Knock, Knock, Knock Port knocking is a legitimate security concept that has been discussed on Slashdot recently, and some virus writers have started using it "secure" their own backdoors. A legitimate port knocking application would often parse firewall logs, waiting for a sequence of logged errors and then spring to life, manipulating firewall rules to open a port. There are multitudes of backdoors out there that are far more sophisticated and stealthy than MyDoom, and port knocking is just one way of several to add a layer of control and stealth. www.securityfocus.com /columnists/221   (1205 words)

port knocking - a Whatis.com definition Port knocking takes advantage of firewall rules to allow a client who knows the "secret knock" to enter the network through a particular port by performing a sequence of connection attempts (called a knock sequence). Port knocking is an authentication method used by network administrators to control access to computers or other network devices behind a firewall. This Linux Journal article explains how port knocking works. whatis.techtarget.com /definition/0,,sid9_gci1012117,00.html?track=NL-34&ad=494239   (232 words)

Port knocking Port knocking is slick: a service only accepts requests which have knocked the ports in a predetermined pattern. IE, normally sshd is listening for requests on port 22, but with port knocking it wouldn't even acknowledge its existence to a ping or request unless you had hit port 1048, 1037, 2059, 1950, 4050, 40, 1048, and then port 22 within a specific amount of time. I got pointed to a nifty idea called port knocking several weeks ago and have spent a decent chunk of time going through it. www.drunkenblog.com /drunkenblog-archives/000220.html   (306 words)

5102-22-5481894.html Port knocking can allow you to have the best of both worlds: a port closed most of the time with the ability to be opened from anywhere by those in the know. Port knocking is a method of allowing access to firewalled services given a preconfigured "knock." The knock consists of a sequence of access attempts to closed ports on a system. Port knocking is obviously not recommended for services you wish to be publicly accessible, such as HTTP and SMTP. builder.com.com /5102-22-5481894.html   (1219 words)

2002 Toyota Tacoma 4 cyl engine knocking - Tacoma - Car Discussion Forums - Helping the Automotive Community Online Another thing that he said the knocking noise could be due from the engine balancer weight, which lies under the oil pan when its removed. I have just brought my 2002 tacoma 4x4 with 4 cylinder engine in to the dealer for the second time for an inceasingly louder knocking sound, especially when the truck is started cold, but it is also audible at cruising speeds. Using a headset, and amplified microphone, was able to localize the noise to the front of the motor, in the region of #1 cylinder, in the head area, and not in the block, however I make no generalization as to this knocking problem be isolated to only one type of failure. www.automotivehelper.com /topic31554.htm   (5565 words)

2000 Millenia S Millenium Ed. Engine Knocking - Millenia/Xedos 9 - Automotive Forums .com Car Chat- A Message Board for Every Make and Model I have a problem with engine knocking and shaking only after car sits for a long time and its cold outside. Engine Knocking - Millenia/Xedos 9 - Automotive Forums.com Car Chat- A Message Board for Every Make and Model Once i rev the engine the problem is gone but then may randomly come back only when driving at low speed (under 30 or so) I took it to the dealer they havent found anything, the told me to use regular gas istead (dumb)..i did it became even worse.. www.automotiveforums.com /t342409-2000_millenia_s_millenium_ed__engine_knocking.html   (150 words)

Club RSX Message Board - Engine Knocking The computer on the engine would retartd the timing to keep the engine from knocking. You put the tip of a flat head on the valve cover and put your ear on the handle if you hear a poping or knocking you have a knock in the engine. I think it sounds as if it is, when the engine is at low revs in high gear, and a lot of gas is applied. forums.clubrsx.com /showthread.php?t=2397   (1022 words)

A critique of port knocking - Search Engine Optimization, Google Optimization knocking is a method of "message transmission across closed ports." It works like this: initially a firewall blocks all ports on the server. The client issues a series of connection requests (knocks) to different ports; these are, of course, dropped since the ports are blocked. However, there is a daemon that monitors the log files for connection requests, and the sequence of requests serves as an encrypted code. www.seochat.com /showblog/638/A-critique-of-port-knocking   (658 words)

Diesel Engine Diagnostics DEET 5 Excessive blue smoke indicates problems from low engine compression and/or worn piston rings, scored cylinder walls or leaking valve stem seals The blue smoke is caused by crankcase oil entering the combustion chamber and being emitted after partial combustion through the exhaust The most common reason for white smoke are in-operative glow plugs low engine compression, a bad injector spray pattern, late injection timing or injection pump problems. Diesel engine compression test is similar to compression test for petrol engine. www.peemac.sdnpk.org /resource/fert/tips5.html   (961 words)

Bad Cat Converter And Engine Knocking - Volvospeed Forums The engine knocking has been there for some time, and it disapears when I use high octane. Is it possible that knocking is caused by the bad cat as perhaps it is partially obstructed, thus affecting not only exhaust itself but the readings of the two oxygen sensors? As I had an episode of floodind the engine with gas after I inadvertently let water accumulate on the spark plug housings after washing the engine (It would not start, and I unfortunately only figured it out when idecided to check the plugs for spark), I kind of expected to have a cat problem. www.volvospeed.com /vs_forum/index.php?showtopic=9211   (528 words)

Engine knocking noise - suggestions please - Cherokee - Automotive Forums .com Car Chat- A Message Board for Every Make and Model I did an engine flush and fresh oil change at 121000 miles and added the STP oil addititive (blue bottle) but there was absolutely no change in the level of knocking. Knocking from beneath the engine at idle, after it warms up. engine componants that can be effected by other causes and problems with the engine. www.automotiveforums.com /t12467.html   (1748 words)

Re: [TriLUG] Port Knocking Alternatives? Port knocking then appears to be the perfect method for preventing unauthorised access through port scans. By requiring enough steps in the port knocking, the chances of a random port scan accessing a port knock can be reduced to an arbitrary level (a factor of 1:65536 for each extra port knocked). Port Knocking: A Method for securing a computer by allowing connections when no ports are open www.mail-archive.com /trilug@trilug.org/msg24428.html   (1206 words)

NewsForge A critique of port knocking There are two reasons why a port knocking attacker may be thwarted: one is that only some ports are allowed in knock sequences (customized by the user) and the second is that the knock sequence can be encrypted with a password. The author assumes that if port knocking becomes widespread, say to the point that 10% of all servers use it, then 10% of the time an attacker will find that his port-knocking attacks were worthwhile. I like the fact that the port knocking implementation is not written in C, a language which is subject to buffer overflow bugs. software.newsforge.com /software/04/08/02/1954253.shtml   (4187 words)

Bill Bumgarner: Port Knocking The claim is that because "knocking" on closed ports doesn't cause a stateful exchange, there is no way for the "hacking client" know that port knocking is being used. There are, of course, all kinds of fun things that could be layered on top of "port knocking" to make it harder to crack, but it is still largely an exercise in obscuring the means of access. The authors of that site also mention that Port knocking can generalize beyond protection of ports to transfer of data across closed ports. www.pycs.net /bbum/2004/2/6   (459 words)

Slashdot Combining Port Knocking With OS Fingerprinting Port knocking is an excellent way to greatly reduce the probability that someone will be able to use a newly discovered exploit from using it against your server before an update is available to fix the exploit. As long as port knocking schemes are implemented on two OSes, you could let the port knocker determine which OS you're connecting from, and connect to a specific service depending upon it. The primary purpose of port knocking is to hide the fact that you have open ports to begin with. www.defcon.org /html/links/dc_press/archives/12/slashdot_combiningportknocking.htm   (3439 words)

port definition - isp.webopedia.com - The Glossary for Internet Service Providers To port an application, you need to rewrite sections that are machine dependent, and then recompile the program on the new computer. On PCs, the parallel port is a Centronics interface that uses a 25-pin connector. Externally, personal computers have ports for connecting modems, printers, mice, and other peripheral devices. isp.webopedia.com /TERM/U/port.htm   (263 words)

Consumer complaints about GMC Yukon - Engine Noise The service tech told me that the knocking noise was “normal” for the 2002 engines and that it did not affect the performance in anyway. He explained that this was a problem with the 2002 engines and drew a picture of the pistons to explain why the noise occurs. The Yukon is one of the trucks GM has been quietly buying back because of engine noises that experts say are "piston slap," one of those things that only gets worse with time. www.consumeraffairs.com /automotive/gmc_yukon_engine.html   (853 words)

DiscoWeb Message Boards - Loud knocking sound, new engine and still knocking Hello, my 95 disco had a rather loud knocking sound which sounded like it was coming from the bottom end of the engine, so i replaced it with a 4.0 short block. The truck is still making the knocking sound even with teh new engine, so i guess it wasnt the engine knocking. I also have no codes, no flickering oil light, good oil pressure, noise kinda reminds me of a diesel engine when I sit at idle with the windows down if that sounds similar to your noise. www.discoweb.org /forums/printthread.php?t=443   (1762 words)

Engine Knocking, 94 850 Na - Volvospeed Forums Usually the knocking is heard when going uphill, particularly in first or second gear. There are no leaks in the exhaust manifold, engine runs OK, starts Ok and performance is OK. But the knocking is there. 3-Remove the intake manifold and check if the knock sensors are properly torked and connected, even though I have not gotten any codes related to them. www.volvospeed.com /vs_forum/index.php?showtopic=11575   (856 words)

engine knocking - Venture - Car Discussion Forums - Helping the Automotive Community Online My girlfriend has a chevy venture 99 and when she was driving it today it stalled out and now when it starts it has a huge knocking coming from the engine compartment. The engine light came on a couple weeks ago and read that it was the o2 sensor at the time so she brought it in and fixed whatever they thought it was. O really do not think they fixed anything important. www.automotivehelper.com /topic234680.htm   (135 words)

VWvortex Forums: Engine knocking after ATP stage II install! When I lifted my hood it sounded like a loud knocking noise where my cam is, my friends say it's my piston hitting my spark plug or like a bent valve but since i've put this turbo kit I have'nt driven it hard at all. I had this happen to me once after I chnaged my head, it was ticking like a mofo, I was so pissed I got in the car the drove the hell out of it, from 1 thru 4 redlining in every gear, when I came to a stop the ticking was gone. Now i have a 260 cam with adjustable cam gear (gear set right in center). forums.vwvortex.com /zerothread?id=1896767   (619 words)

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