try a skateboard, im serious
on
Personal Transport?
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· Score: 3, Insightful
If you are staying within SF, try a skateboard. Im not talking about the kind of skateboard you see people doing tricks on, im talking about one meant for going places. During commute hours, i can get places faster on my skateboard than i can on muni. As for distance, i skate 60 blocks all the time, no problem. You can take a skate board on every public transit system. If you're looking for a good place to buy a skateboard for transit, try purple skunk at 23rd and geary.
You could use two antennas, but it is not as simple as connecting the wires, you need to use a 2 to 1 RF transformer meant for 2.4ghz, but there are plenty of these devices made these days because of the proliferation of 2.4ghz devices. I see them advertised in rf design all the time.
yes, the regulations are all about ERP(effective radiated power), not how much power your putting into your feed line. For many services this means that if you are running the maximum power, and add an antenna with more gain, you must drop your power. But for point to point networking in the 2.4ghz ISM(industrial, scientific, medical) band you are are allowed to use directional antenna for point to point communictations, upto i belive 6db gain and still run maximum power. Above that you must drop your power, but the requiered drop is something like 1db less power for every 2db of gain, so it's not to bad. Keep in mind that my numbers are not correct.
But the other thing to consider is that i think most cards dont run the maximum allowed power, so you should be able to use a high gain antenna with any problems.
ALso, keep in mind that the regulation allowing high gain antennas without lower power specifies point to point communications, so that 20db gain yagi ontop of your car might not be legal.
The other thing to remember with 802.11b, is that 802.11b isnt the only thing on the 2.4ghz ism band, and ISM isnt the only thing 2.4ghz is allocated for. There is also amatuer allocation covering the same frequencies, and there has been at least on case of someone having to shutdown an 802.11b network do to interference it was causing.
Also always keep in mind
you very much can have an smtp server that does not listen on a tcp port, but it can only be used for outgoing mail. Many people use this configuration with sendmail so they can send mail directly from there workstation, but recive mail on another system. Sendmail is just invoked from the command line, so it doesnt need to listen on a tcp port.
i belive this is how several of the blacklists currently work, at least for the removal. I dont know if they automatically go out and hunt for open relays.
you seem to be not understanidng something. Open relays are not uasualy set up by spammers, they are uasualy setup unknowingly by companies for there corprate email and things like that. Then a spammer finds out that the server is an open relay, and starts to bounce there spam off it. So it is not at all an issue of spammers finding a way to avoid having there mail servers detected, a smart spammer would not run an open relay on there own server, because open relays get blocked, and can cost you money if someone starts to send a large amout of traffic through the server.
The only time you would have someone trying to avoid their server being detected as an open relay is when they use the server for legitimate(non-spam) purposes, but are to lazy to make the server not an open relay.
to wipe a whole drive in linux, or just 1 partition, i would say the thing to use would be dd. dd if=/dev/urandom(or/dev/random if your really paranoid) of=/dev/. doing that 10 times ought to work fairly well. To make it go quicker, use/dev/zero instead of/dev/urandom, but it wont be as secure.
The CdC(cult of the dead cow) released a tool 2(or 3) years ago that did something verysimilar. IIRC it used a technique like the one you described, but over smb. So whenever a windows machine said "i wisht o call myself server, are any of you chaps using that name", it always said "yes sir, thats my name, don't wear it out". I think it would also make itself the PDC by whenever an election for PDC came up, said "I run windows 99999". I think it ran on windows and unix. Though this is all just a vague recolection of the CdC talk at defcon in 2000.
I think the audio version is even better.(dd if=linux-2.4.17.tar.bz2 of=/dev/dsp)
Re:I've seen the future, and it is Doom. Good doom
on
3D Desktops for Linux?
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· Score: 3, Interesting
last year someone modified quake to do something like this. It was just for killing proccecess. Each proccess was a character, and you could really kill them.
no, not 12 bits in a byte. But the fastest usb ever really get sin real world situations is 1 megabbyte per second, and frequently it doesnt get that much.
It is no problem to have a machine with no local storage, people have been doing this for decades(well, at least one decade), you use nfs for the root file system. The are 2 ways to handle/etc, you can make a seperate nfs share for each machine, or you can make/etc generic enough that it can be used by all the machines, and just hand out IPs vai dhcp. the latter is the preferable method. It makes it very easy to make changes to all the machines in the cluster, all you have to do is edit 1 file.
there are 2 ways you can handle booting the machines, the wrong way to do it is to have every machine boot off of a floppy drive. The right way to do it is to get network cards that can accept a boot rom(there are lots of cheap ones that can), and use etherboot.
If you really need to, you can use swap over nfs, but its not going to be fast.
I suggest at least 2 nics in each node, one for the booting and nfs, and the other for for the the actual work happening on the cluster. gigabit is a good idea. switched is a necesity.
a high quality ups will make true sine waves, not psuedo sine waves out of square waves. but with a pc, it doesnt really matter because it gets converted to dc anyways. but with things like televisions(and proably some monitors) it can cause problems.
nikon does not make a digital back that you can put on a film slr, and i have been told by an engineer from nikon that they never will. what they do make is a digital slr that takes standard nikon lenses, actually, they make three of them, the D1, the D1x and the D1, but they are very expensive, they start at $6000. the D1 was released fall 1999.
if you look around photo.net, at good portion of it is shot on digital these days, and most people dont object. most people on photo.net don't even object to using photoshop to do small things to scanned prints, like cover dust spot, or increase the bringhtness a small amount. what they do object to is large changes to the images. they object to it because it isnt photgraphy, it's digital manipulation. They would object just as much is people were submiting scans of paints they had painted.
And as for digital SLRs, you wont find one for under $3000usd.
film still has more resolution, and more range than digital. I have yet to see a digital camera that comes anywhere near the quality of roleiflex shoot 6cm*6cm frames of kodak tech pan, hell i dont think they come near the quality of a 35 mm camera shooting tech pan.
The other problem with digital is the cost. to get a digital body that has interchangeable lenses, the minimum you are looking at is $300. im sorry, the magnifying filters they have for some digitial cameras just don't cut it.
But don't get me wrong, I shoot digital frequently, it is great for quick snapshots. it is nice to not have to scan in prints. its nice to have pictures online in less than 5 minutes. But the main thing I do is art photography.
Im of the opinion that digital photography and film photography should be considered two different mediums, because they are very different, and have different uses. saying people should stop using film because we have digital now is like saying painters should stop using oil paints because we have acrylic paints now. or like someone 15 years ago saying that photographers should stop using SLRs because we have these nice handy point and shoot cameras now. they have different uses.
this would not alter the image of the moon at all. the proposal is to put it on the far side of the moon, the side that is always facing away from the earth, the side that we cannot see.
this is why you put/sbin and/usr/sbin first in your path,/bin and/usr/bin second, then/usr/local/sbin and last but not least/usr/local/bin. and never put . in your path
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If you are staying within SF, try a skateboard. Im not talking about the kind of skateboard you see people doing tricks on, im talking about one meant for going places. During commute hours, i can get places faster on my skateboard than i can on muni. As for distance, i skate 60 blocks all the time, no problem. You can take a skate board on every public transit system.
If you're looking for a good place to buy a skateboard for transit, try purple skunk at 23rd and geary.
You could use two antennas, but it is not as simple as connecting the wires, you need to use a 2 to 1 RF transformer meant for 2.4ghz, but there are plenty of these devices made these days because of the proliferation of 2.4ghz devices. I see them advertised in rf design all the time.
yes, the regulations are all about ERP(effective radiated power), not how much power your putting into your feed line. For many services this means that if you are running the maximum power, and add an antenna with more gain, you must drop your power. But for point to point networking in the 2.4ghz ISM(industrial, scientific, medical) band you are are allowed to use directional antenna for point to point communictations, upto i belive 6db gain and still run maximum power. Above that you must drop your power, but the requiered drop is something like 1db less power for every 2db of gain, so it's not to bad. Keep in mind that my numbers are not correct.
But the other thing to consider is that i think most cards dont run the maximum allowed power, so you should be able to use a high gain antenna with any problems.
ALso, keep in mind that the regulation allowing high gain antennas without lower power specifies point to point communications, so that 20db gain yagi ontop of your car might not be legal.
The other thing to remember with 802.11b, is that 802.11b isnt the only thing on the 2.4ghz ism band, and ISM isnt the only thing 2.4ghz is allocated for. There is also amatuer allocation covering the same frequencies, and there has been at least on case of someone having to shutdown an 802.11b network do to interference it was causing. Also always keep in mind
you very much can have an smtp server that does not listen on a tcp port, but it can only be used for outgoing mail. Many people use this configuration with sendmail so they can send mail directly from there workstation, but recive mail on another system. Sendmail is just invoked from the command line, so it doesnt need to listen on a tcp port.
i belive this is how several of the blacklists currently work, at least for the removal. I dont know if they automatically go out and hunt for open relays.
you seem to be not understanidng something. Open relays are not uasualy set up by spammers, they are uasualy setup unknowingly by companies for there corprate email and things like that. Then a spammer finds out that the server is an open relay, and starts to bounce there spam off it. So it is not at all an issue of spammers finding a way to avoid having there mail servers detected, a smart spammer would not run an open relay on there own server, because open relays get blocked, and can cost you money if someone starts to send a large amout of traffic through the server.
The only time you would have someone trying to avoid their server being detected as an open relay is when they use the server for legitimate(non-spam) purposes, but are to lazy to make the server not an open relay.
to wipe a whole drive in linux, or just 1 partition, i would say the thing to use would be dd. dd if=/dev/urandom(or /dev/random if your really paranoid) of=/dev/. doing that 10 times ought to work fairly well. To make it go quicker, use /dev/zero instead of /dev/urandom, but it wont be as secure.
The CdC(cult of the dead cow) released a tool 2(or 3) years ago that did something verysimilar. IIRC it used a technique like the one you described, but over smb. So whenever a windows machine said "i wisht o call myself server, are any of you chaps using that name", it always said "yes sir, thats my name, don't wear it out". I think it would also make itself the PDC by whenever an election for PDC came up, said "I run windows 99999". I think it ran on windows and unix. Though this is all just a vague recolection of the CdC talk at defcon in 2000.
actually, it is The de Raadt.
no, that would be completely wrong. enacspeak is for output, not input.
I think the audio version is even better.(dd if=linux-2.4.17.tar.bz2 of=/dev/dsp)
last year someone modified quake to do something like this. It was just for killing proccecess. Each proccess was a character, and you could really kill them.
Almost every usb keyboard that i have seen has a built in hub.
but that doesn't answer the question. He is looking for an external drive, those are internal drives.
no, not 12 bits in a byte. But the fastest usb ever really get sin real world situations is 1 megabbyte per second, and frequently it doesnt get that much.
actually, he wouldn't be. at one point in the early 80s(or was it late 70s?) the moderator of rec.funny.humor was banned from the net.
there are 2 ways you can handle booting the machines, the wrong way to do it is to have every machine boot off of a floppy drive. The right way to do it is to get network cards that can accept a boot rom(there are lots of cheap ones that can), and use etherboot.
If you really need to, you can use swap over nfs, but its not going to be fast.
I suggest at least 2 nics in each node, one for the booting and nfs, and the other for for the the actual work happening on the cluster. gigabit is a good idea. switched is a necesity.
a high quality ups will make true sine waves, not psuedo sine waves out of square waves. but with a pc, it doesnt really matter because it gets converted to dc anyways. but with things like televisions(and proably some monitors) it can cause problems.
i have heard of a digital back from rollei, but i also heard that it is around $20,000. are there any cheaper ones out there?
nikon does not make a digital back that you can put on a film slr, and i have been told by an engineer from nikon that they never will. what they do make is a digital slr that takes standard nikon lenses, actually, they make three of them, the D1, the D1x and the D1, but they are very expensive, they start at $6000. the D1 was released fall 1999.
And as for digital SLRs, you wont find one for under $3000usd.
film still has more resolution, and more range than digital. I have yet to see a digital camera that comes anywhere near the quality of roleiflex shoot 6cm*6cm frames of kodak tech pan, hell i dont think they come near the quality of a 35 mm camera shooting tech pan.
The other problem with digital is the cost. to get a digital body that has interchangeable lenses, the minimum you are looking at is $300. im sorry, the magnifying filters they have for some digitial cameras just don't cut it.
But don't get me wrong, I shoot digital frequently, it is great for quick snapshots. it is nice to not have to scan in prints. its nice to have pictures online in less than 5 minutes. But the main thing I do is art photography.
Im of the opinion that digital photography and film photography should be considered two different mediums, because they are very different, and have different uses. saying people should stop using film because we have digital now is like saying painters should stop using oil paints because we have acrylic paints now. or like someone 15 years ago saying that photographers should stop using SLRs because we have these nice handy point and shoot cameras now. they have different uses.
this would not alter the image of the moon at all. the proposal is to put it on the far side of the moon, the side that is always facing away from the earth, the side that we cannot see.
yes, but if /bin/ls is before /usr/local/bin/ls in the path, the real one will get execed, not the faked one.
this is why you put /sbin and /usr/sbin first in your path, /bin and /usr/bin second, then /usr/local/sbin and last but not least /usr/local/bin. and never put . in your path