By default all major distributions of Linux nowadays are IPv6 enabled.
That is true also for Ubuntu server v6.06.1 aka Dapper Drake.
Sometimes leaving IPv6 enabled can cause little annoyances.
Fire up your favourite text editor and sudo edit this file
/etc/modprobe.d/aliases
Replace the line alias net-pf-10 ipv6 with alias net-pf-10 off.
Restart the computer and check the result with this line
ip a | grep inet6
If nothing appears IPv6 has gone :-)
Read here the original article
giovedì 17 gennaio 2008
giovedì 27 dicembre 2007
Mac OS X (Tiger) and VPN
This article applies to the latest update of Mac OS X Tiger, 10.4.11. I cannot tell, if you can find the option described here, in a previous version of the operating system.
In Mac OS X you can create VPN client connections by the application Internet Connect, under the Application folder.
The procedure is straightforward, but at the end there is only one annoying issue.
When you decide to start up your new VPN connection to connect to the remote LAN it is impossible to use your gateway to continue to surf the web or download e-mails until you close the VPN.
In the best scenario you end up using the gateway of the remote LAN in the worst one you are limited to access only machines and devices of the remote LAN.
The solution is not too far. Select the menu "Connect" and then Option from the Internet Connect app.
Uncheck "Send all traffic over vpn connection" and confirm your choice.
This is a global option, that applies to every VPN connection you may have in your list.
In Mac OS X you can create VPN client connections by the application Internet Connect, under the Application folder.
The procedure is straightforward, but at the end there is only one annoying issue.
When you decide to start up your new VPN connection to connect to the remote LAN it is impossible to use your gateway to continue to surf the web or download e-mails until you close the VPN.
In the best scenario you end up using the gateway of the remote LAN in the worst one you are limited to access only machines and devices of the remote LAN.
The solution is not too far. Select the menu "Connect" and then Option from the Internet Connect app.
Uncheck "Send all traffic over vpn connection" and confirm your choice.
This is a global option, that applies to every VPN connection you may have in your list.
martedì 11 dicembre 2007
Mac OS X and the file hosts
Mac OS X stores the file hosts in /private/etc directory.
hosts is useful when there is no DNS server on the LAN and you want to reference a computer by name instead of its IP address.
In the majority of the Unix systems and Windows as well, editing the hosts file is sufficient to achieve the goal.
In Mac OS X it is also necessary to make changes at the local NetInfo database.
Here's how.
Mac OS X: How to Add Hosts to Local hosts File
hosts is useful when there is no DNS server on the LAN and you want to reference a computer by name instead of its IP address.
In the majority of the Unix systems and Windows as well, editing the hosts file is sufficient to achieve the goal.
In Mac OS X it is also necessary to make changes at the local NetInfo database.
Here's how.
Mac OS X: How to Add Hosts to Local hosts File
mercoledì 17 ottobre 2007
Starting Mac OS X in safe mode
Booting up Mac OS X in safe mode can solve some troubleshooting issues.
Beginning with Mac OS X version 10.2 and later it is possible to start the operating system in a special mode called "Safe Boot".
To do so you must press the shift key, just after switching on your Mac and holding it down until you see the spinning gear under the gray apple.
Find out what maintenance procedures are run, reading this Apple knowledge base article.
Beginning with Mac OS X version 10.2 and later it is possible to start the operating system in a special mode called "Safe Boot".
To do so you must press the shift key, just after switching on your Mac and holding it down until you see the spinning gear under the gray apple.
Find out what maintenance procedures are run, reading this Apple knowledge base article.
mercoledì 3 ottobre 2007
Windows XP desktop disappeared
What if one day you turn on your PC and instead of displaying the desktop full of icons you'll just see the wallpaper.
And worse, even rebooting in safe mode has the same result.
Before preparing to reinstall the operating system you can try this.
Bring up task manager pressing Ctrl-Alt-Del. Choose "New task" from the File menu.
Type regedit in the run box and search for the following registry key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution.options
There should be two subkeys. One named explorer.exe and the other iexplore.exe.
Delete both keys, close the Registry editor and restart the computer.
And worse, even rebooting in safe mode has the same result.
Before preparing to reinstall the operating system you can try this.
Bring up task manager pressing Ctrl-Alt-Del. Choose "New task" from the File menu.
Type regedit in the run box and search for the following registry key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution.options
There should be two subkeys. One named explorer.exe and the other iexplore.exe.
Delete both keys, close the Registry editor and restart the computer.
lunedì 17 settembre 2007
Resource Fork, how to get rid of it
Use the informations of this post at your own risk
You can loose data if you don't know what you are doing
How do you know if one file has associated resource fork with it.
It's fairly simple.
Open up the Terminal application. Change the directory to the one the file is located and type this command
ls -la filename/rsrc
If the file "filename" has resource you'll see an output like this one
-rw-r--r-- 1 yourusername yourusername 57847 Jan 1 2004 filename/rsrc
In this case the resource fork size is 57847 bytes long.
If the file has no resource fork at all, the file size should be 0 (zero).
What about get rid of this resource information
Create an empty file
touch emptyf
and copy it over the resource
cp emptyf filename/rsrc
Check the result issuing the ls command again
ls -la filename/rsrc
This time the output should look like this
-rw-r--r-- 1 yourusername yourusername 0 Sep 17 10:48 filename/rsrc
To know more about the macintosh file system read these articles
Apple
Wikipedia
giovedì 17 maggio 2007
Getting the username password logon panel
In system preferences under account, login option, there are three choices regarding the way Mac OS X displays the logon panel to the user at the end of the startup process.
- Automatic logon as
- Users list
- Name and password
Generally the User list is the preferred picking because of the picture.
There are a sequence of keys that can momentarily change this behaviour from User list to Name and password.
Press the 'esc' key. The password box disappears.
Press the first letter of a user name in the list. The foreground around the picture and the name become darker.
Press alt(option)+shift+enter(return)
and in a matter of a second the panel changes its appearance, asking you to type in the user name and your password.
- Automatic logon as
- Users list
- Name and password
Generally the User list is the preferred picking because of the picture.
There are a sequence of keys that can momentarily change this behaviour from User list to Name and password.
Press the 'esc' key. The password box disappears.
Press the first letter of a user name in the list. The foreground around the picture and the name become darker.
Press alt(option)+shift+enter(return)
and in a matter of a second the panel changes its appearance, asking you to type in the user name and your password.
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