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Netgear AC750 Wifi Range Extender (EX3700)

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Posted by: z24 | Sun, Jul 24 2016 | Category: /hardware | Permanent link | home
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LAN messaging with XMPP protocol (jabber) to chat or to copy and paste links and texts in rdp sessions

Here is how I satisfied my need to have a LAN messaging program, not really to chat with other users on the same LAN, which I could do, but to copy and paste links or texts between a rdp client and a rdp server when copy and paste from/to clipboard does not work in rdp sessions, for instance with some Android rdp clients.

These are the programs I used:

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Posted by: Z24 | Wed, Aug 27 2014 | Category: /software | Permanent link | home
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.htaccess: an example of the Apache per-directory configuration file

Using bloxsom as my weblog designing application, I had to provide some settings to the Apache .htaccess configuration file to fine-tune the usage of my site:

  1. tell Apache to load index.cgi in addition to the default index.htm
  2. rewrite the requested address adding www. if it's omitted
  3. rewrite the requested address adding index.cgi if it's omitted
  4. and for bandwidth reduction, forbid robots from crawling some pages
(Updated May 17 2014)

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Posted by: Z24 | Wed, May 04 2011 | Category: /configurations/both | Permanent link | home
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Running Windows XP in Xen from its own partition

Some months ago I made some experiments with Xen and I succeeded to install and run Windows XP as a guest using Xen 3.0. In that case Windows was located in a single file and was installed through Xen. My purpose now is to make Xen running an already installed Windows from its own partition. Just to be more specific, this is my machine configuration:

I want to log into linux and run my existing Windows XP from its own partition on the EIDE disk.

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Posted by: Z24 | Mon, Dec 03 2007 | Category: /linux | Permanent link | home
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Recover "Logical sector size is 0" with dd

A few hours ago while I was using my pc suddenly Windows froze completely (mouse was stuck and Ctrl+Alt+Del did nothing). It's not astonishing but I was quite surprised because such a freeze never happened since I began using Windows XP on my new pc.
The problem appeared at the reboot: grub, the bootloader on /dev/sda, showed this error message:

13 : Invalid or unsupported executable format

I have a dual boot configuration with Windows XP booting from a EIDE disk and Ubuntu booting from a SATA disk, so I entered Ubuntu, successfully; /dev/hda1 (the Windows partition) was not mounted while /dev/hda5 and /dev/hda6 were; attempting to mount it resulted in

Special device /dev/hda1 does not exist

At reboot I started Windows XP Recovery Console from the Windows CD and tried CHKDSK.EXE, and this was the outcome:

The volume appears to contain one or more unrecoverable problems

I booted again linux to launch fsck and see it fail:

Logical sector size is zero.

Then I found the solution in ubuntu forum:
root@am2:/home/z24# dd if=/dev/hda1 of=/defmedia/bkup_fat32_hda1.img bs=512 count=2048000 conv=noerror,sync
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 43.61 seconds, 24.0 MB/s

root@am2:/home/z24# dd if=/defmedia/bkup_fat32_hda1.img of=/home/z24/sector6.bin bs=512 count=1 skip=6 conv=noerror,sync
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.011544 seconds, 44.4 kB/s

root@am2:/home/z24# dd if=/home/z24/sector6.bin of=/dev/hda1 bs=512 count=1 conv=noerror,sync,notrunc
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.030644 seconds, 16.7 kB/s
Explanation: In the original post the partition that was just backupped with dd was also checked with losetup and mount. Thanks a lot to the ubuntuforums user Onlymee for his post!
Update 13.09.2008
The same problem happened again today and gave me the opportunity to complete the series of error messages :)
The first, at boot time, was the same:

grub: 13 : Invalid or unsupported executable format

Mounting the partition (mount -t vfat /dev/sda1 /mnt):

mount: wrong fs type, bad option, bad superblock on /dev/sda1, missing codepage or other error

dmesg | grep sda1

VFS: Can't find a valid FAT filesystem on dev sda1

But fdisk -l /dev/sda shows the partition table.
fsck.vfat /dev/sda1 (executed from Ubuntu 8.04 alternate cd)

Cluster size is zero

The solution was exactly the same: copy the sixth sector back to the first. And voilà, it booted.


Posted by: z24 | Sun, Jun 24 2007 | Category: /hardware | Permanent link | home
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WAMP & Perl - Windows Apache, MySQL, PHP with CGI scripts written in Perl

I need Perl to run Blosxom, an open source and free CGI script to create blogs.
So I installed WAMP5 1.6.4a and ActivePerl with MSI installer.
I already have my site on my disk, so I told my site directory to WAMP during the setup procedure and then I pointed my browser to http://localhost/index.cgi but it displayed the cgi instead of executing it.
This is what I did to make it work:

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Posted by: Z24 | Sun, Sep 10 2006 | Category: /configurations/windows | Permanent link | home
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Install and boot Windows on a second hard disk

I have a SATA disk and a EIDE disk, I installed Linux on the SATA disk and now I want to install Windows on the EIDE disk.
Because Windows must be installed on the disk that boot first, I entered BIOS and changed the boot order as this:
EIDE disk
SATA disk
Then I installed Windows on the EIDE disk.
I want to configure dual boot this way:

I changed BIOS boot order as it was previously (SATA disk before EIDE disk) and booted Linux, then I added these lines to /boot/grub/menu.list (on Ubuntu or Debian; if grub is not installed try apt-get install grub):
title WinXP
map (hd0,0) (hd1,0)
map (hd1,0) (hd0,0)
rootnoverify (hd1,0)
chainloader +1
That means Windows believes the EIDE disk is the first and SATA is the second, so it's happy and if I reboot and choose WinXP from grub menu it starts.


Posted by: Z24 | Wed, Aug 30 2006 | Category: /windows | Permanent link | home
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Running PHP scripts from command-line with WAMP (Windows Apache, MySQL, PHP)

On my old pc I installed Apache, MySQL and PHP singularly, and I made some PHP scripts to be runned from command-line, like this:

c:\php\php -f myscript.php
On my new pc I installed WAMP5 1.6.4, all was running fine (phpMyAdmin, my local website, php scripts pointed to by the browser) but php scripts launched by command-line reported
Fatal error: Call to undefined function mysql_connect() in myscript.php
Obviously I changed the php path to c:\wamp\php\php but with no results.
Solution: change the command to
c:\wamp\php\php -c c:\wamp\apache2\bin -f myscript.php
The -c option tells php to search php.ini in the directory specified, and that's needed because WAMP puts php.ini in Apache bin directory, while with a PHP regular installation php.ini is located in the php.exe directory.


Posted by: Z24 | Sun, Aug 27 2006 | Category: /configurations/windows | Permanent link | home
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