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Stop sharing of 'Public' folders Network
Once I had setup my sharepoints via the brilliant tip by 'dreness', I became somewhat irritated by the apparent inability to prevent sharing of users' Public folders.

I have a lot of user logins on my machine for various tasks. When hooking into to my OS X box from another machine, this made the volume list include 7 or 8 volumes when all I wanted to make available to guests were just two of the volumes – a technical resource and my music folder.

To disable the default sharing of public directory's you need to take a trip into NetInfo Manager (in Applications/Utilties). Read the rest of the article for the details on the exact steps.
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A third method of creating shared folders Network
Inspired by the work on the prefPane and App named SharePoints [editor: method one], as well as the direct route [editor: method two] explained in this forum for adding shares, I wrote an AppleScript to do the same things in the Finder, the way it used to be in Mac OS 9.

Visit for the source script and downloadable Toolbar applet. Contact me at with comments and ideas.

[Editor's note: I haven't tried this yet, but the source is available, so you can see for yourself what it does.]
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Run a script when PPP is started or stopped Network
I recently discovered that if you have a script located at /etc/ppp/ip-up then it will get called every time a PPP connection is started. Similarly, if you have a script at /etc/ppp/ip-down then it will get called every time the connection goes down. It is important that the execute bit is set on the script, and you proabably have to be root to create and save the file. Here's how to set the execute bits on the two scripts:
chmod a+x ip-up
chmod a+x ip-down
I use it to start and stop fetchmail (pop-smtp mailing software). But by using 'open', you could probably do anything. A word of caution: It may be running stuff as root so a sudo username whatevercommands might be useful.

[Editor's note: I don't have a PPP connection, so I can't test this...]
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Change TCP settings on each restart Network
Hi! First of all thanks for this site.:)
I drop these few lines to provide some help, if needed, about a issue i've read here some weeks ago. To make a long story short, i have made a startup script to enable the network hacks you posted here to encrease the TCP receive windowsize:
sudo sysctl -w net.inet.tcp.recvspace=64960
(i've increased a little the original!). and the one that deals with the delayed ack:
sudo sysctl -w net.inet.tcp.delayed_ack=0
The problem with these commands is that they reset to default on every restart (if you have to restart a machine with OS X on it, eh eh!). So, i've made a little folder to put into your StartupItems folder (/System/Library/StartupItems) and you're set. This little script enables these tricks on every restart. Download it here. You have to su to root to copy it to the desired folder (of course!).

Hope it helps!

[Editor's note: I have not tried this on my machine.]
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IrDA works with 10.1.1 Network
Living in Europe, the mobile is my daily companion and so are my needs to connect remotely to my office. All the messages I read about the support of IrDA have been negative, telling me that the IrDA is not strategic any more for Apple anyway.

What a surprise when I did a new installation with the Mac OS X 10.1.1 CD coming with the new PbTi 550MHz: IT WORKS! I can choose the infrared connection using the Network Preferences and just by copying the Nokia modem scripts from Mac OS 9 I'm able to connect remotly to my office again. One big step to MacOS X in my daily business for me.

[Editor's note: I'm not sure if this is news or not, but everything I've seen has certainly indicated that IrDA was not supported on the newer Macs in OS X.]
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Share any folder or volume via Filesharing! Network
We've had the ability to create share points when using personal file sharing for quite some time. Simply click a folder and select File -> Sharing, set your options, and go. With OS X, that functionality seems to have disappeared. According to Apple, we need OS X Server for this, but that is not so. Here's how you can create your very own share points in Mac OS X:
  1. Open NetInfo Manager and authenticate.
  2. Create a new subdirectory in /config/SharePoints/ (click on config, then on SharePoints, then select Directory -> New Subdirectory).
  3. Set the name value to be what you'd like the share to be called (double-click on the Value column next to name).
  4. Add a new property (Directory -> New Properyt) and name it directory_path.
  5. Add a new value for directory_path. The value needs to be the path of the folder or volume (for example, /Users/username/Pictures).
  6. Save your changes in NetInfo.
  7. In the Finder, set the privileges on the folder or volume you'll be sharing. Do Show Info, then Privileges, and pick what you like -- Drop Box, Read Only, etc.
  8. Stop and restart the AFP Server from the Sharing preferences panel.
  9. Connect from a client and they will see the new share.
Notes: Users with admin privledges may not see the new share point, since they can see all volumes from the top anyway. Also, if you share items with spaces anywhere in the path, do not quote or otherwise escape the spaces when you add the directory_path into netinfo. If the volume being shared is read only (a CD ROM, for example), then just skip step seven.

[Editor's note: This is probably the most useful tip I've seen in quite a while! I just tried it, and it worked exactly as described - my "Pictures" folder became available as a read-only volume to the AppleShare network - slick!. I wonder how difficult it is to wrap a GUI application around updating NetInfo?? That would be a killer OS X app!]
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Enable AppleShare logging Network
Since moving to OS X, I've missed Mac OS 9's File Sharing Activity Monitor. The next best thing I've found is the ability to turn on logging for file sharing. Here's how to enable it:
  1. Open NetInfo Manager (found in the Applications/Utilities folder).
  2. In NetInfo Manager, choose /config/AppleFileServer.
  3. Choose the "activity_log" property. Change its value from "0" to "1".
  4. Choose "Save" from the NetInfo Manager "Domain" menu.
  5. Stop and restart File Sharing in System Prefs.
  6. Find your log in /Library/Logs/ApplefileService/AppleFileServiceAccess.log
Although there is a "guest_access" property under AppleFileServer, it doesn't appear that you can turn guest access off using it (it's set to "0" by default). Too bad.
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Simplify modem script to remove problems Network
I was having some odd connection problems with my Apple powerbook internal v90 modem. Random connection failures and disconnections. So I started looking at the modem script (inside /library/modem scripts). I read somewhere that with modems it's better to start simple so I commented out the existing init string and replaced it.

I replaced:
write "AT&FE0W1Q0V1X4&C1&K3S95=1&D3S7=75S0=013"
write "AT&F13"
(Note: The exact line in the script may be different from that shown above, there are several versions of it. In the apple script it is below "label 3")

I seem to have had fewer connection problems. Although I can't say for sure that this alteration is the cause, and I'd be interested to see if this changes things for other Apple modem users. The side effect is that you cannot see the connection speed anymore.

[Editor's note: I'm unable to test this myself. You should probably make a backup of your script file before changing it.]
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Tweak TCP settings for possible speed increases Network
Depending on your kind of connection to the Internet, you may be able to improve your network performance under OS X by tweaking the TCP receive window size. In my case, I was downloading the OS X 10.1 Developer Tools, which consists of 19 segments, 18 of which are 10 MB in size (the last being around 7 MB). A typical segment download took me 8 minutes, but after the tweak it was cut in HALF! Needless to say this is an immense improvement, considering that I was still using the same connection. You can tweak the TCP receive window size by doing this:
%sudo sysctl -w net.inet.tcp.recvspace=40960

In this example I'm changing the size to 40960, or 40 KB. OS X defaults to 32 KB which is adequate for most connections, but since you have better knowledge of network conditions, you can make use of it to get results like I did. Experiment with other values to find the optimum.

Have fun.

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Useful utilities for Windows networking Network
Mac OS 10.1 with Samba built-in is a life saver. But without 3rd party CIFS clients, such as Sharity, I can't browse the resoruces on Windows servers. I have Sharity student license but have found it's inconvenient when dealing with many Windows servers -- only 2 connections allowed at a time. In order to check the resource on the third server I have to get into Sharity and disconnect one of the logged in servers. A few days ago I found something interesting: .nsmbrc and smbutil.

.nsmbrc is the configuration file for the Samba connections. The personal configuration file is in your home directory ~/.nsmbrc (don't forget the dot), and the global configuration file is at /usr/local/etc/nsmb.conf. For example, you can have this in your personal .nsmbrc file:
Now when you connect to a Windows server via Finder's Connect to Server command, the Workgroup field in the login panel is automatically filled in. Settings in .nsmbrc can also be used by smbutil.

smbutil is an interface to SMB requester. It has many functions for Samba file systems and logging in/out to the Windows server. However, the ability to browse Windows resource is the most useful one.
    % sudo smbutil view //Account_Name@Server_Name
You'll be asked for your local password, then your windows password. For servers in different workgroup, use this:
    % sudo smbutil view -W Workgroup_Name //Account_Name@Server_Name
I still can't figure out why smbutil only allows administrators to view resources. If you execute smbutil without sudo, you'll simply get an error. Please refer to the man pages of smbutil and mount_smbfs for more information.

Now I just want a GUI for smbutil!
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