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10372 discussions

Wirelessness and XP
by Peter 19 Feb '06

19 Feb '06

Has anyone encountered anything like the following? Start out with a netgear ADSL wireless router, new laptop, XP up to date, and coming into the admin interface of the router through a wired ethernet connection on another computer. Plug in, and the wireless network is recognised immediately. However there is no authentication or security, and it is recommended to change the SSID. I change it, and reboot the device. The old SSID is now shown in XP, along with the new name as a second network. In the admin interface for the router, at the top level, the new name is shown. Further down in the stack, the old name is shown - there are two menus, one where you change the SSID, the other where you allow or don't allow multiple SSIDs. It is in the second one that the old SSID shows up. Delete the old network in XP, and try to use the new one. Can't. Delete all of them in both machines, create a new one on the device. Now no network is visible, though the admin interface says its there, and the wlan light is on. Decide to try creating a new one, on the device. The old one, now supposedly deleted, now appears and can be connected to. What is going on, asks my friend? I spent a couple of hours on this in increasing embarassment, and not understanding at all what was happening. How could it be that networks which the router thought were there should not be visible from XP, and vice versa? Why did rebooting the device not seem to work as you'd expect? The devices by the way were on the same table top, so signal strength wasn't an issue. Was I missing something blindingly obvious? Thought wireless Linux was difficult, but its nothing compared to this! Peter

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DHTML date format - where can I find a description?
by Chris Green 18 Feb '06

18 Feb '06

I'm playing with tables in TWiki and one of the parameters for a date column is "DHTML date format" which specifies the format of the date (I assume). However I can't find anywhere that documents it, does anyone have any suggestions - either where to find doucmentation or a basic description? -- Chris Green (chris(a)areti.co.uk) "Never ascribe to malice that which can be explained by incompetence."

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Could this happen on Linux?
by Ted.Harding＠nessie.mcc.ac.uk 18 Feb '06

18 Feb '06

Hi Folks, I've just been reading a shocking story on R-devel (the developers' mailing list for the R statistical programming language). Quote: "Over on R-help, the old problem of floating point precision has come up again (see my example below, where calling RSiteSearch can change the results of the var() function). The problem here is that on Windows many DLLs set the precision of the fpu to 53 bit mantissas, whereas R normally uses 64 bit mantissas. (Some Microsoft docs refer to these as 64 bit and 80 bit precision respectively, because they count the sign and exponent bits too). When R calls out to the system, if one of these DLLs gets control, it may change the precision and not change it back. This can happen for example in calls to display a file dialog or anything else where a DLL can set a hook; it's very hard to predict." In other words (if I understand aright), certain programs or processes can change the way the CPU functions when doing floating point arithmetic with the result that other programs will subsequently operate in a different FP environment and get different answers. I'd like to think that Linux was immune to this kind of thing, but can't see an a priori refutation of the possibility. What are the informed views on such a question? Best wishes to all, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding(a)nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 18-Feb-06 Time: 16:12:56 ------------------------------ XFMail ------------------------------

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Anyone for Fat Cat tonight?
by David Noble 17 Feb '06

17 Feb '06

Anyone for Fat Cat tonight? --Daven

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Belkin PCI wireless card
by Ian bell 17 Feb '06

17 Feb '06

I am having some trouble configuring a newly acquired belkin wireless network card. I have it working but it is a kludge and I don't know why it works so I would like some advice. I have sorted the kernel module (rt2500.o) and I have added modprobe wlan0 to the end of rc.modules tp load it. It loads ok and I can ifconfig to my heart's content but it won't connect to my wireless router. I ran netconfig to set up dhcp but the client dhcpcd does not seem to get run. Running from the console does nothing but await the timeout. route shows just the local loopback. However, by accident I discovered that if I ran kwifi and configured the card to look for my router in infrastructure mode, then if I run dhcpcd wlan0 everything works. route shows that dhcp has made the necessary connections. OK I can do this manually every time but I don't understand what it is that kwifi is doing. Obviously there is a step I am missing somewhere. Can anyone help? I am running Slackare 10.1 Cheers Ian

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Colour lasers
by Barry Samuels 16 Feb '06

16 Feb '06

I want to get a colour laser printer but find the offerings rather confusing. Can anyone recommend one to work with Linux from experience? I want it to be capable of producing good prints from digital photographic images as well as general documents. I know that any Postscript printer should work with Linux but I remember seeing someone on ALUG say don't get one which uses Postscript as a layer over the printer's native language because it makes printing slow. A number of printers describe 'Postscript emulation' or 'Postscript simulation' - is there any difference? Are these the slow ones? Very often it is not clear whether a particular printer is true Postscript or not. What would I have to spend to get a true Postscript printer? Which ones should I avoid? -- Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain

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How to become another user, without password, but keep environment?
by Chris Green 16 Feb '06

16 Feb '06

In my role at work at the moment I frequently have to become other users (mostly build management logins rather than specific user logins). To make this easier for myself I put myself in the user's .rhosts file so that I don't have to give the password every time I become the other user. This is inside a small[ish] development group so this doesn't raise any difficult security issues really. However if you 'rlogin -l newuser hostname' you get newuser's environment. This is OK sometimes but often is a bit of a pain because I need to reset DISPLAY to get X applications to work on my screen and I also lose my favourite editor, etc., etc. So is there any way to preserve the environment in the same way that would happen if I did an 'su newuser' but, on the other hand, allow me to login in without entering the password (as I can with rlogin)? I can thing of various nasty scripting ways of doing it but su is so close to what I want it seems a pity to re-invent an almost invented wheel. -- Chris Green (chris(a)areti.co.uk) "Never ascribe to malice that which can be explained by incompetence."

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Firewall routing problems
by Stuart Bailey 16 Feb '06

16 Feb '06

Hi, I have a customer who is try to give me access to some data for testing, on one of their server, port 5000. If I telnet to their port from my server, I can't get a connection, unless I disable my firewall - not something I like to do. If I look at a tcpdump for port 5000, I can see the connection going out to the internet (5000 is enable in my firewall), and I can see that the masquerading ports are in the same range as when I send SMTP or HTTP packets - which work fine. Any ideas what else can be causing the problem? I'm using Guarddog to configure the iptables. Many thanks. Stuart. -- --------------------------------------- Stuart Bailey BSc (hons) CEng CITP MBCS LinuSoft (Proprietor) Linux Specialist (01953) 601294 (07778) 383739 http://www.linusoft.co.uk ----------------------------------------

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Hosting questions
by Chris Green 15 Feb '06

15 Feb '06

My wife wants to register a set of domains for a small (long term) project she's thinking of starting. I've checked and a nice set of 'same name' domains are available as .com, .co.uk and .biz. The question is should I just register the domains and host them on the home Linux system or can I get a reasonable deal from anywhere for hosting and registration all in one go? Can anyone recommend a single registration company/site which can do all these TLDs at a reasonable price? I've used Just The Names for my isbd.ltd.uk domain and they are reasonably priced for .com and .co.uk but they're expensive for .biz. If I host them on the home system (which already hosts isbd.ltd.uk forwarded from Just The Names) is it possible to 'virtual host' a number of domains even when they're registered with (possibly) different companies? -- Chris Green (chris(a)areti.co.uk) "Never ascribe to malice that which can be explained by incompetence."

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[OT] Fault puzzle
by Ted.Harding＠nessie.mcc.ac.uk 14 Feb '06

14 Feb '06

Hi Folks, Your experience may help here. Today I was phoned by a friend who'd switched on her PC only to get the message "Operating system not found", together with the observation that "DHCP" and "MBA" had come up on screen. The only special circumstance was that the machine had been left unused and switched off for just over a week. So I went round and had a look. Switch on, and enter Setup. Check Boot Order: Floppy, CD-ROM, HDD, Network, and MBA-UNDI. So decided that this was consistent with failing to boot off HDD and proceeding to try booting off the network ("DHCP") which failed (since no network) and then "MBA-UNDI" (whatever that is). So tabbed over to IDE setup to see what whas there, or not. Apparently the HDD and its parameters showed up OK. So quit Setup without saving and let it re-boot. Success: clean boot off HDD. Repeatable -- shut down, switch off, disconnect from mains, re-connect, switch on -> clean re-boot as if nothing had ever happened. Provisionally, therefore, thought that the week's off-time had resulted in the CMOS battery draining, so that it had lost its data which were somehow restored when I went into Setup and poked around. But then it occurred to me that if that were so, then the CMOS clock should have the wrong time (e.g. some hours or days slow). Not so: in fact it was 5 minutes fast. So that seems to not favour my hyptohesis. Leaving me wondering what might really have happened. The only thing I did was have a look inside the Setup and re-boot, not altering a thing. Any ideas? With thanks, and best wishes to all, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding(a)nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 13-Feb-06 Time: 22:00:00 ------------------------------ XFMail ------------------------------

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