> IIRC, MIT has a class B IP range, MIT has 18.0.0.0/8 which is a class A range. > meaning it has 255^3, or 16,581,375 IP addresses. You mean 2^24 or 256^3 which is 16777216 addresses.
>>Why don't you use your ISP's mail relay? >Um, perhaps because I don't want to send from >ab0003cvd@residential-provider.com, but instead from >postmaster@mydomain.org ?
Most ISP's will let you send email though their outgoing mail servers with anything you like in the from field. If your ISP dons't complain to them or change provider.
What do they use those chips for? Microwaves and stuff? Toaster ovens?
No, an 8bit microcontroller and a 32Khz (0.032MHz) digital watch crystal have more than enough processing power to run a microwave.
No point using a general purpose processor, IO and memory chips when a single microcontroller and a couple of relays will do the job.
I doubt you can connect a film keypad diretly to the pins of a transmeta processor.
It's not common at the moment but orange reccently launched a flat rate data service. 25UKP (about 38USD) per month for roughly 56Kbps internet access wherever you are with your laptop. This will probably be popular
with buisness people who want email everywhere. Per minute fees to access the internet from a mobile phone easily exceed 25 quid a month for ocassional peak time use.
I'v been told by a geek aquantance that GPRS operates over ATM which provides a virtual circuit. This means using GPRS on the move works very badly because it takes minutes for the ATM layer to find you when you move from one cell to another and then trys to deliver all the retry packets that both ends have been putting out in the meantime rarther than drop them as expected.
Wireless data with CB radio's didn't work very well for me.
Eight bit home computers had plastic cases with no shielding. They produced lots of noise that interfered with radio reception and transmitting near them caused crashes, paticularly if you illegally used one of the cheap non-linear harmonic spewing amplifiers sold to CBers.
I only had one friend geeky enough to participate so it was quicker to bike the mile to his house with a cassette tape than to mess about sending something to him at 300 baud. Hours of fun though.
Years later I got a ham license and went on the packet radio network. It was like newsgroups and fidonet, I contacted my local bbs and messges were stored and forwarded across the global. It took about a month to send a message from the UK to Australia and get a reply. Then we eventually got flat rate internet and everyone lost interest in packet.
In the last few years all the local geeks, hackers and technical types with any enthusiasm have moved south for jobs and opportunitys. I should have followed them. A few people in the Newcastle linux user group are interested in building an 802.11 WAN but we don't have enough people to get it off the ground.
He points out that "it's a bit of a strawman to argue that startup time doesn't matter." and you respond with... a strawman argument! None of your links are applications where the startup time time matters which actually support's the AC's point of view.
The conclusion of everyone who is talking in the channel is that this version is not usable due to frequent crashing. We can't tell if the routing works because the mesh constantly changes as clients crash.
Files are only shared if they are actually in the files directory, it does not search subdirectorys.
The connection list in the program often shows fewer connections than are actually open.
To compile on FreeBSD 5.1, you have to change all 'make' to 'gmake' and remove "typedef int socklen_t" and change the path of bash to/usr/local/bin/bash for MUTE/configure.
This uses broadcst search. It is disapointing that people keep reinventing the horribly inefficient original gnutella. Broadcast search will severely limit the search horizon (and probably overall size) of a mesh. We need a filesharing program that combines anonymity with an efficient search function, the state of the art is a distributed hash table with querys and results sent by UDP.
It is a pity that this ended up on slashdot now. If this had been announced when a working version is available slashdot might have given it the critical mass of users to get it rolling.
This has lots of potential and will be worth another look when it is stable
I loaned a box set of SuSe to a couple of friends to try on old machines (around 300MHz). They both decided they don't like linux because it is too slow based on their experiances of kde3.0
A 300MHz machine is a usable surfing/wordprocessing machine. It is very disapointing that KDE makes such a machine annoying to use.
>You're talking about processing gain. Actually I'm not, all the digital signal processing in the world won't let you operate outside the Shannon limit.
>I use/test/setup equipment that goes 50km at 0.5W of power. That means nothing unless you specify the frequency and mode of transmission. A half watt morse code transmitter on HF will go much further than that. A half watt walkie talkie on VHF won't go very far if you are at the bottom of a valley.
>7 MHz for 250 Kbps is not so great. You should get 28 250Kbps channels in there
The article is distinctly light on technical details.
It might be full duplex, ie 250Kbps in both directions at the same time,
even that is a poor data rate to bandwith ratio.
The quote from Dr Borg says they are not channelising though that dosn't rule out the 250Kbps figure being a timeslice allocated to a paticular station.
I'd like to know what modulation scheme they are using for this.
I suspect they are compensating for a low signal to noise ratio at
the receiver by using more bandwidth.
Shannon's law (if I'v worked it out correctly) says that you need a minimum of -16dB signal to noise ratio to send 250Kbps over a 7MHz wide channel.
That gives it plenty of margin to cope with high path loss and in channel noise.
40Km is a good distance with 20watts at 45MHz. There will be a little
bit of groundwave propagation past the horizon but not much. They will
need to get the antenna's pretty high up or operate hilltop to hilltop.
>I believe his name is "Dick" as well. Yes, he uses that name. The subject of internet connection sharing came up on my local linux usergroup mailing list. I suggested a cheap NAT router on the grounds of noise (no fans or whirring drives). It's a friendly local discussion list and I was a bit shocked to get a flaming rant from Mr Morell in response.
Pressing a button to skip a commercial is annoying if you are trying to do somthing else while watching TV. Imagine lots of PVR's hooked up to the internet. The PVR's talk to each other and form groups that are showing the same channel. When someone hits the skip-commercial button his PVR sends out some UDP packets addresses to other PVR's that are watching the same channel. The other PVR's send out relay packets to half a dozens others and so on so the messges gets out as quickly as possible and one PVR dosn't have to directly inform a hundred others.
A cancel-skip button would take you back to befor the skip and reduce the repuatation of the person who just pressed the wrong button on the remote or deliberatly caused a bad skip. People who cause bad skips get ignored.
Plenty of scope for options, eg immediate skip versus on-screen text "autoskip in 3...2...1", learn mode to find other people who use the skip button at the same time you do etc, require several votes to skip when there are over a dozen people watching the same channel.
It would not need a huge mass of people to be usefull. Three or four people who happen to watch TV at the same time would be enough.
If you are being annoyed by a gang of 12 year old's damaging your fence and being a nuisance then asking them to stop, chasing them around and trying to take away their football with not do you any good. They will get back at you by acting like kids and setting your fence on fire. You have no real power over them.
Abram's is dealing with bunch of people with a mental age of 12. Abrams would be better off taking a more subtle approach. Make the site go.... really.....really.....slooooow... for fakers. Set up fakefriends.com (fakester.com is taken) and transfer faker accounts to a seperate system.
He could even take the radical approach of allowing fakers, provided they are marked as such. Have part of the signup be the questions "Are the details you have entered true?" and "is this a real picture of you?". Give people the option of removing all fakers from thier view of friendster.
Is port 4444 a cmd.exe shell or what? A machine on the same ISP as me has been trying to connect to 445 on my box for three days. Guess what 4444 is open. I'd like to leave a message on the desktop (yes this is probably illegal, no there is no chance of me being prosecuted for it.) Tried typing a few commands and got no response.
A shell bound to a port is often difficult to use because you get the output of stdout but not stderr so for example a directory list shows up but an incorrect command returns nothing.
>It's been hitting efnet for the past week Uh, I think the lame trojan backdoor.irc.cirebot is a different thing to the worm that this story is about. It used the same hole to install a backdoor but didn't spread on its own. Some irc networks make your ip address visible to others, I suspect kids were manually launching cirebot at people.
The blaster worm which this story is about dosn't seem to be anywhere near the scale of code red. Yet. I'm seeing a couple of incoming connection attempts an hour to 135 and 445 which is normal.
The ccc has set up a bluetooth device tracking
system at Chaos Camp.
Chaos camp is currently happening in a field near Berlin.
There are about 10 monitoring points around the campsite, when someone wanders
past with a bluetooth phone in their pocket it is logged on a webpage.
The type of bluetooth device is shown along with the device name such
as "Jim's ph0wn" or "Nokia 789"
This uses off the shelf bluetooth dongles.
The potential for tracking people is obvious as is the potential for setting
up an early warning system to detect your boss comes through the front door.
Chaos camp has a 155Mbit link via a microwave dish on hydraulic tower
mounted on a truck. The camp seems to have fallen off the internet at
the moment, a kid has probably single handedly DoSed the entire LAN again.
I can't link to the bluetooth tracker page just now.
> There are a lot of theories regarding electromagnetism and the pyramid shape True, however only the theorys that involve Maxwell's equations and a lot of advance mathematics can actually be used to predict the behaviour of electromagnetic waves in antennas. A theory involving aliens building pyramids will not tell you what angle the sides of your horn antenna should flare out at.
>This sort of thing has been around for decades.
Reputedly this technique has been used for log tables since the seventeenth century.
A few hundred years before the invention of the electronic gadgets slasdotters take for granted people were navigating the world in sailing ships and calculating thier longditude and latitude with a sextant to measure the angle from the ground to the sun or a star, a clock and a book of log tables. Napier produced log tables in the 1600's but an accurate shipboard clock was only invented in 1764.
A book of log tables can be used to multiply integers quickly using
A*B=antilog(log A + log B) or to calculate triginometic funcitions like sine, cosine and tan.
Original production of a book of log table took a lot of mathematical work. Publishers reputedly seeded the books with errors in the last digit to catch copiers. Link
Slashdot Mirror
> IIRC, MIT has a class B IP range,
MIT has 18.0.0.0/8 which is a class A range.
> meaning it has 255^3, or 16,581,375 IP addresses.
You mean 2^24 or 256^3 which is 16777216 addresses.
>>Why don't you use your ISP's mail relay?
>Um, perhaps because I don't want to send from >ab0003cvd@residential-provider.com, but instead from >postmaster@mydomain.org ?
Most ISP's will let you send email though their outgoing
mail servers with anything you like in the from field.
If your ISP dons't complain to them or change provider.
No, an 8bit microcontroller and a 32Khz (0.032MHz) digital watch crystal have more than enough processing power to run a microwave. No point using a general purpose processor, IO and memory chips when a single microcontroller and a couple of relays will do the job. I doubt you can connect a film keypad diretly to the pins of a transmeta processor.
It's not common at the moment but orange reccently launched a flat rate data service. 25UKP (about 38USD) per month for roughly 56Kbps internet access wherever you are with your laptop. This will probably be popular with buisness people who want email everywhere. Per minute fees to access the internet from a mobile phone easily exceed 25 quid a month for ocassional peak time use. I'v been told by a geek aquantance that GPRS operates over ATM which provides a virtual circuit. This means using GPRS on the move works very badly because it takes minutes for the ATM layer to find you when you move from one cell to another and then trys to deliver all the retry packets that both ends have been putting out in the meantime rarther than drop them as expected.
Wireless data with CB radio's didn't work very well for me.
Eight bit home computers had plastic cases with no shielding.
They produced lots of noise that interfered with radio reception and transmitting near them caused crashes, paticularly if you illegally used one of the cheap non-linear harmonic spewing amplifiers sold to CBers.
I only had one friend geeky enough to participate so it was quicker to bike the mile to his house with a cassette tape than to mess about sending something to him at 300 baud. Hours of fun though.
Years later I got a ham license and went on the packet radio network.
It was like newsgroups and fidonet, I contacted my local bbs and messges were stored and forwarded across the global. It took about a month to send a message from the UK to Australia and get a reply. Then we eventually got flat rate internet and everyone lost interest in packet.
In the last few years all the local geeks, hackers and technical types with any enthusiasm have moved south for jobs and opportunitys. I should have followed them. A few people in the Newcastle linux user group are interested in building an 802.11 WAN but we don't have enough people to get it off the ground.
RTFA. That quote is from the CEO of a company that monitors filesharing networks and therefore has a vested interest in movie downloads continuing.
He points out that "it's a bit of a strawman to argue that startup time doesn't matter." and you respond with... a strawman argument!
None of your links are applications where the startup time time matters which actually support's the AC's point of view.
>efnet #mute-net
/usr/local/bin/bash for MUTE/configure.
The conclusion of everyone who is talking in the channel is that this version is not usable due to frequent crashing. We can't tell if the routing works because the mesh constantly changes as clients crash.
Files are only shared if they are actually in the files directory, it does not search subdirectorys.
The connection list in the program often shows fewer connections than are actually open.
To compile on FreeBSD 5.1, you have to change all 'make' to 'gmake' and remove "typedef int socklen_t" and change the path of bash to
This uses broadcst search. It is disapointing that people keep reinventing the horribly inefficient original gnutella. Broadcast search will severely limit the search horizon (and probably overall size) of a mesh. We need a filesharing program that combines anonymity with an efficient search function, the state of the art is a distributed hash table with querys and results sent by UDP.
It is a pity that this ended up on slashdot now. If this had been announced when a working version is available slashdot might have given it the critical mass of users to get it rolling.
This has lots of potential and will be worth another look when it is stable
Is this significantly faster then kde 3.0?
I loaned a box set of SuSe to a couple of friends to try on old machines (around 300MHz). They both decided they don't like linux because it is too slow based on their experiances of kde3.0
A 300MHz machine is a usable surfing/wordprocessing machine. It is very disapointing that KDE makes such a machine annoying to use.
>You're talking about processing gain.
Actually I'm not, all the digital signal processing in the world won't let you operate outside the Shannon limit.
>I use/test/setup equipment that goes 50km at 0.5W of power.
That means nothing unless you specify the frequency and mode of transmission. A half watt morse code transmitter on HF will go much further than that. A half watt walkie talkie on VHF won't go very far if you are at the bottom of a valley.
The article is distinctly light on technical details. It might be full duplex, ie 250Kbps in both directions at the same time, even that is a poor data rate to bandwith ratio.
The quote from Dr Borg says they are not channelising though that dosn't rule out the 250Kbps figure being a timeslice allocated to a paticular station.
I'd like to know what modulation scheme they are using for this. I suspect they are compensating for a low signal to noise ratio at the receiver by using more bandwidth. Shannon's law (if I'v worked it out correctly) says that you need a minimum of -16dB signal to noise ratio to send 250Kbps over a 7MHz wide channel.
That gives it plenty of margin to cope with high path loss and in channel noise.
40Km is a good distance with 20watts at 45MHz. There will be a little bit of groundwave propagation past the horizon but not much. They will need to get the antenna's pretty high up or operate hilltop to hilltop.
>I believe his name is "Dick" as well.
Yes, he uses that name. The subject of internet connection sharing came up on my local linux usergroup mailing list. I suggested a cheap NAT router on the grounds of noise (no fans or whirring drives). It's a friendly local discussion list and I was a bit shocked to get a flaming rant from Mr Morell in response.
About 6 years back I developed and setup a Cyber Cafe management system that ran 100% off Linux and Open Source tools.
I'd like to see that. Is it available on the web?
>copying software isn't theft or crime, it's just copyright violation
It's a crime here in the UK. It was changed from a civil offense to a specific crime around about 1990.
A geeky idea occours to me.
Pressing a button to skip a commercial is annoying if you are trying to do somthing else while watching TV. Imagine lots of PVR's hooked up to the internet. The PVR's talk to each other and form groups that are showing the same channel. When someone hits the skip-commercial button his PVR sends out some UDP packets addresses to other PVR's that are watching the same channel. The other PVR's send out relay packets to half a dozens others and so on so the messges gets out as quickly as possible and one PVR dosn't have to directly inform a hundred others.
A cancel-skip button would take you back to befor the skip and reduce the repuatation of the person who just pressed the wrong button on the remote or deliberatly caused a bad skip. People who cause bad skips get ignored.
Plenty of scope for options, eg immediate skip versus on-screen text "autoskip in 3...2...1", learn mode to find other people who use the skip button at the same time you do etc, require several votes to skip when there are over a dozen people watching the same channel.
It would not need a huge mass of people to be usefull. Three or four people who happen to watch TV at the same time would be enough.
What about this?
If you are being annoyed by a gang of 12 year old's damaging your
.... really .....really.....slooooow ... for
fence and being a nuisance then asking them to stop, chasing them
around and trying to take away their football with not do you any
good. They will get back at you by acting like kids and setting
your fence on fire. You have no real power over them.
Abram's is dealing with bunch of people with a mental age of 12.
Abrams would be better off taking a more subtle approach.
Make the site go
fakers. Set up fakefriends.com (fakester.com is taken) and
transfer faker accounts to a seperate system.
He could even take the radical approach of allowing fakers,
provided they are marked as such. Have part of the
signup be the questions "Are the details you have entered true?"
and "is this a real picture of you?". Give people the option
of removing all fakers from thier view of friendster.
Is port 4444 a cmd.exe shell or what? A machine on the same ISP as me has been trying to connect to 445 on my box for three days.
Guess what 4444 is open. I'd like to leave a message on the desktop
(yes this is probably illegal, no there is no chance of me being prosecuted for it.) Tried typing a few commands and got no response.
A shell bound to a port is often difficult to use because you get the output of stdout but not stderr so for example a directory list shows up
but an incorrect command returns nothing.
>It's been hitting efnet for the past week
Uh, I think the lame trojan backdoor.irc.cirebot is a different thing to the worm that this story is about. It used the same hole to install a backdoor but didn't spread on its own.
Some irc networks make your ip address visible to others, I suspect kids were manually launching cirebot at people.
The blaster worm which this story is about dosn't seem to be anywhere near the scale of code red. Yet. I'm seeing a couple of incoming connection attempts an hour to 135 and 445 which is normal.
The page with information about the bluetooth tracker is here.
Chaos camp is currently happening in a field near Berlin. There are about 10 monitoring points around the campsite, when someone wanders past with a bluetooth phone in their pocket it is logged on a webpage. The type of bluetooth device is shown along with the device name such as "Jim's ph0wn" or "Nokia 789" This uses off the shelf bluetooth dongles. The potential for tracking people is obvious as is the potential for setting up an early warning system to detect your boss comes through the front door.
Chaos camp has a 155Mbit link via a microwave dish on hydraulic tower mounted on a truck. The camp seems to have fallen off the internet at the moment, a kid has probably single handedly DoSed the entire LAN again. I can't link to the bluetooth tracker page just now.
> There are a lot of theories regarding electromagnetism and the pyramid shape
True, however only the theorys that involve Maxwell's equations and a lot of advance mathematics can actually be used to predict the behaviour of electromagnetic waves in antennas. A theory involving aliens building pyramids will not tell you what angle the sides of your horn antenna should flare out at.
Reputedly this technique has been used for log tables since the seventeenth century.
A few hundred years before the invention of the electronic gadgets slasdotters take for granted people were navigating the world in sailing ships and calculating thier longditude and latitude with a sextant to measure the angle from the ground to the sun or a star, a clock and a book of log tables. Napier produced log tables in the 1600's but an accurate shipboard clock was only invented in 1764.
A book of log tables can be used to multiply integers quickly using A*B=antilog(log A + log B) or to calculate triginometic funcitions like sine, cosine and tan.
Original production of a book of log table took a lot of mathematical work. Publishers reputedly seeded the books with errors in the last digit to catch copiers. Link
>[AOL] have absolutely no spam filtering
AOL maintains an extensive list of open mail relays and proxys to block sources of spam.