It helps a lot that you don't need a PC to be able to record them...very useful if, for example, you're visiting someone and hear something you'd like to record. So, on that count they beat CDR and MP3 players.
Lack of people with players isn't really such a problem for recordable media. And in quite a few parts of the world, they're not *all* that expensive.
What happens when the DHCP server goes down? You still get a bloody IP address.
Your machine knows it's not a proper address though, and keeps trying to get a new one. And it does return a fairly valid error if you try to reach another machine by IP address which is unreachable.
you may get conflicts when a new machine enters the zone and already had an address
Yes, that would be a problem.
Admittedly it's very confusing if you don't know it's happening... but then, you do need *some* address to use as the source address for DHCP requests, and it's better to use something from a range which doesn't stomp on any other network.
Adhoc networks would be better running IPv6, pity there's no Windows based file-sharing stack for it yet...
If you have use of the old addresses for a little while after the new addresses are available, maybe you could run a NAT box on the old addresses for a short while so that inbound traffic could be directed to the new addresses. Maybe something like this -
1. setup the NAT box 2. change IP addresses on a machine 3. add NAT rule to direct traffic to new address 4. if more_machines_to_move goto 2 5. beer/pizza/etc, you earned it (:
Or instead of using a NAT box like that, you could possibly put it in front of customer servers and/or routers, so they could keep the configuration with their old addresses for a while longer, giving you a little more breathing space (obviously you need to update DNS while you're doing that - you might find tinydns, part of the djbdns package, useful as it can control the TTLs, making it fairly easy to expire DNS records at a particular time and replace them with new ones).
I know an ISP that has been putting off renumbering for several years, I don't think their former transit providers are too happy about having part of their own netblocks announced at them:/
Think of it as a challenge and also proof that there are certain (fairy limited) circumstances where NAT doesn't completely suck!
That's interesting. I usually use filtered tap water myself, since I really don't like the taste of chlorinated water, and it's much cheaper than buying bottled water. (Obviously, after the chlorine has been removed, it's not really safe to keep it for very long). Nice to know that it's likely to be purer.
If travelling to areas of the world with uncertain water quality (either tap or bottled), apparently beer is often safer than water:)
Yes it is - different minerals. In some of the more extreme cases (particularly comparing bicarb-heavy ones with the more neutral ones) there are quite different flavours.
Re:Not totally independent...
on
Solar Surgery
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· Score: 2
Also, I don't think this will ever see use in poor countries. First, the geography must be just right for there to be enough sunlight, this eliminates a lot of places.
There's actually quite a lot of places this would be viable. Large parts of the world have good sunlight for enough of the year this could be well worthwhile (in fact, on average I think many economically poorer countries have a lot more sunlight than richer countries - there could be some interesting changes when the oil runs out!).
IANAMedProf either but I'm sure that some types of surgery carried out by laser can't really be done any other way.
The cost of sending people to train others how to use the equipment is probably much greater than the cost of the equipment itself... some organisations do think it's worth it for other solar technologies, so it's quite possible it could work here. $1000 for something reusable without need of sterilization at very high temperature for extended periods of time (*how* much fuel is needed each time?!) isn't that excessive.
plain old sterilized surgical stainless steel
In some circumstances sterilizing and reusing isn't deemed enough. (Though of course there are big problems with cheap reusable instruments too).
the collector must track the sun as it moves, and this implies some sort of motor. Hence I would not go so far as to say that this could be used anywhere without power. Sure, it could run on batteries,
In the UK I have seen chicken-sheds using solar power for heating incubators. (No doubt this is used in other countries too). The power from PV arrays is plenty to drive a motor to track the sun so that optimum lighting is maintained throughout the hours of daylight. Much better than using batteries containing fairly toxic chemicals don't you think?
Definitely enable SoftUpdates if you're using one of the BSDs. It will ensure metadata stays consistent as much as possible. Much better behaviour in case of unexpected shutdown. Actually, with SoftUpdates a boot-time fsck isn't required, it can happen after boot in the background - but that won't be in a released version of FreeBSD until 5.0. Much faster startup on a system with large filesystems.
If someone blasts off packets to random addresses with the source address set to those of likely sources (*.get-time.org, Microsoft's ntp, and so on) then sooner or later one will arrive at a time coincident with when an update is taking place and hence be let through the firewall. If there's an active attack on a particular machine that's all the more likely to happen.
An attacker doesn't have to worry about each individual attack succeeding. The IIS worms, for example, seemed to work quite well even though most of their packets didn't reach a vulnerable server. I hope that the built-in NTP clients on XP and MacOSX have been thoroughly audited...
Unless authentication is arranged with the relevant stratum 1 machine/s, it is pretty vulnerable: it's UDP, so there are no sequence numbers the firewall can inspect to check that a packet is genuine.
no images due to a disk crash, but this has interesting information about high-precision NTP from GPS on FreeBSD, including an excellent trick to reduce jitter introduced by the usual low-quality PC xtal.
It can help a lot for images, but you really need a much bigger subscriber base for it have enough effect to warrant the cost of the caches. Also, unfortunately it takes a bit of effort for a website to be cache-friendly (things like sending correct Expires: and/or Cache-Control headers, and supplying images from a different URL which doesn't use cookies), and most sites don't seem to care about this.
One area using a cache can help a bit, is if you can run one at each end of the pipe, and route any text/html content through a compressed ssh tunnel. Again, a lot of effort for what usually isn't much return.
Where caches really come into their own is if you've got millions of users and can force everyone to use them.
See this page for more information. 'Simple HTML' runs the html through a sanitizer which is a whitelist which doesn't normally include img, script, object and so on. It looks like the whitelist can be modified in mailnews.display.html_sanitizer.allowed_tags.
Though, at least on Windows, I find Opera+Mulberry a much more pleasant combination (:
Well, that means they were using webbugs - proof that everyone should use mailer agents that either can disable network access or refuse to display HTML.
Some MUAs that are useful for this include:
Mulberry displays HTML without images (Win/Mac/Linux x86+PPC/Solaris) The Bat makes it easy to disable HTML. (Win) Pegasus normally disables downloading images by http (Win)
Of course, this article shows that certain members of the educational IT establishment aren't too keen on the idea of providing quality learning materials free of charge.
Good to know that some people with access to resources realise the need to supplement what's available in schools and don't have shareholders and profits to worry about.
Archive.org seems to be thinking along those lines - they're not hosting the things you ask for, but since they have a library of copyright-free films, and an archive of television news from Sept. 11th, it's probably something they may be thinking of.
It's also worth pointing out that anyone tracking -stable should be keeping up with the freebsd-stable mailing list (in order to learn about any problems or incompatible changes, including any requirements to update the kernel or ports/package, which although rare can happen on occasion).
On a colocated box, perhaps it would be wise to cvsup and wait at least a day or two to check for any problems reported to that mailing list before updating the running system.
-- As noted in the History section, one of the biggest problems with
sysinstall is its user interface which could only be charitably
described as Evil Incarnate. -libh Project
Slashdot Mirror
They've updated their APs to software that tries to find an open channel now, there was a post on BAWUG about it recently.
Lack of people with players isn't really such a problem for recordable media. And in quite a few parts of the world, they're not *all* that expensive.
Admittedly it's very confusing if you don't know it's happening... but then, you do need *some* address to use as the source address for DHCP requests, and it's better to use something from a range which doesn't stomp on any other network.
Adhoc networks would be better running IPv6, pity there's no Windows based file-sharing stack for it yet...
I know an ISP that has been putting off renumbering for several years, I don't think their former transit providers are too happy about having part of their own netblocks announced at them :/
Think of it as a challenge and also proof that there are certain (fairy limited) circumstances where NAT doesn't completely suck!
Click on the hyperlinked word 'volume'.
If travelling to areas of the world with uncertain water quality (either tap or bottled), apparently beer is often safer than water :)
Yes it is - different minerals. In some of the more extreme cases (particularly comparing bicarb-heavy ones with the more neutral ones) there are quite different flavours.
IANAMedProf either but I'm sure that some types of surgery carried out by laser can't really be done any other way.
The cost of sending people to train others how to use the equipment is probably much greater than the cost of the equipment itself... some organisations do think it's worth it for other solar technologies, so it's quite possible it could work here. $1000 for something reusable without need of sterilization at very high temperature for extended periods of time (*how* much fuel is needed each time?!) isn't that excessive.
In some circumstances sterilizing and reusing isn't deemed enough. (Though of course there are big problems with cheap reusable instruments too).In the UK I have seen chicken-sheds using solar power for heating incubators. (No doubt this is used in other countries too). The power from PV arrays is plenty to drive a motor to track the sun so that optimum lighting is maintained throughout the hours of daylight. Much better than using batteries containing fairly toxic chemicals don't you think?Definitely enable SoftUpdates if you're using one of the BSDs. It will ensure metadata stays consistent as much as possible. Much better behaviour in case of unexpected shutdown. Actually, with SoftUpdates a boot-time fsck isn't required, it can happen after boot in the background - but that won't be in a released version of FreeBSD until 5.0. Much faster startup on a system with large filesystems.
An attacker doesn't have to worry about each individual attack succeeding. The IIS worms, for example, seemed to work quite well even though most of their packets didn't reach a vulnerable server. I hope that the built-in NTP clients on XP and MacOSX have been thoroughly audited...
Unless authentication is arranged with the relevant stratum 1 machine/s, it is pretty vulnerable: it's UDP, so there are no sequence numbers the firewall can inspect to check that a packet is genuine.
and this version.
no images due to a disk crash, but this has interesting information about high-precision NTP from GPS on FreeBSD, including an excellent trick to reduce jitter introduced by the usual low-quality PC xtal.
Good quality radios, amplification and antennas at each end can push the signal a lot further than most people would expect.
One area using a cache can help a bit, is if you can run one at each end of the pipe, and route any text/html content through a compressed ssh tunnel. Again, a lot of effort for what usually isn't much return.
Where caches really come into their own is if you've got millions of users and can force everyone to use them.
try here, here, and here, if you haven't already read them.
My local Sony Centre has been advertising region-free players too. Gotta love the way they sit on the fence...
Of course, some companies in the USA know the *exact* same trick...
Though, at least on Windows, I find Opera+Mulberry a much more pleasant combination (:
Mulberry displays HTML without images (Win/Mac/Linux x86+PPC/Solaris)
The Bat makes it easy to disable HTML. (Win)
Pegasus normally disables downloading images by http (Win)
the Earth Edition of The Hitchhiker's Guide to the Galaxy makes a nice reference and project site, and a very fitting memorial.
Of course, this article shows that certain members of the educational IT establishment aren't too keen on the idea of providing quality learning materials free of charge.
Good to know that some people with access to resources realise the need to supplement what's available in schools and don't have shareholders and profits to worry about.
They are also planning an International Children's Digital Library which looks like it could be a very interesting resource.
On a colocated box, perhaps it would be wise to cvsup and wait at least a day or two to check for any problems reported to that mailing list before updating the running system.
--
As noted in the History section, one of the biggest problems with sysinstall is its user interface which could only be charitably described as Evil Incarnate. -libh Project