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Use a wireless bridge to transparently connect computers in one room to computers in a different room when you cannot—or don’t want to—run an ethernet cable between the two rooms.

A standard wireless bridge (client bridge) connects wired clients to a secondary router as if they were connected to your main router with a cable. Secondary clients share the bandwidth of a wireless connection back to your main router. Of course, you can still connect clients to your main router using either a cable connection or a wireless connection.

New in DD-WRT v24 is Repeater Bridge mode. This extends your primary LAN via secondary router (bridge router) and also allows wireless clients to connect to your secondary router. This extends the range of your wireless network while simultaneously allowing wired clients to connect to your secondary router.

Reference Image

In the case in which we are interested, a secondary router running DD-WRT v24 is configured as a Repeater Bridge between a Primary wireless router (of any make/brand/FW) allowing the above configuration.

Assumptions:

Primary router is configured in a 192.168.1.X subnet and leases DHCP address in the same pool. Secondary router is running DD-WRT v24

No security setup will be covered in this Wiki. It will be up to the user to setup security between the Primary and Secondary routers

Note: If you are unsure of what you are doing, is advisable to practice by setting up the router first in client bridge mode and get it working correctly. Client bridge mode is simpler but most of the settings are the same. Once you understand how to set up a client bridge and have it working, then proceed to setting up repeater bridge

Instructions

A very simple step-by-step description to connect a Router running selected DD-WRTV24 firmware in Repeater Bridge Mode. (This will work for almost everything, but do check notes on individual routers below clock).

Use Eko build 11296, with the milworm exploit patch, BS build 12533 or EKO 12548 builds to create a wireless bridge. DO NOT USE SP1 OR THE MAY 24 08 BUILD.

To enable bridge mode between two routers, the primary router must be in AP mode (default) with DHCP Server enabled. The secondary router running DD-WRT v24 will be configured as the Repeater Bridge.

1. Restore Factory Defaults on Secondary (DD-WRT) Router
2. Do a proper HARD 30-30-30 Reset on the router.
3. Set your computer to a static IP of 192.168.1.9
4. Connect to the secondary router via wired or wireless client keeping in mind the dd-wrt default settings for dhcp pool and ssid
5. Open the Wireless -> Basic Settings tab
   • Wireless Physical Interface Section
     • Wireless Mode : Repeater Bridge
     • Wireless Network Mode : Match Primary Router
     • Wireless Network Name(SSID) : Match Primary Router – Make sure you spell this correctly
     • Wireless Channel : Match Primary Router (This will disappear once you put it in RB mode, and isn’t needed)
     • Wireless SSID Broadcast : Enable
     • Network Configuration : Bridged
     • Save
   • Virtual Interfaces Section
     • Add
     • Wireless Network Name(SSID) : Different from Primary Router
       • [NOTE] – You CAN try using the same SSID but many have had random disconnects and/or no connection if the SSID’s are the same. If using the same ssid doesn’t work for you, use a different ssid from the primary router
     • Wireless SSID Broadcast : Enable
     • AP Isolation : Disable
     • Network Configuration : Bridged
     • Save
6. Open the Setup -> Basic Setup tab
   • Connection Type will be: Disabled
   • Set STP for Disabled (Enabled sometimes can cause connection problems) redhawk
   • IP Address : 192.168.1.2 (Assuming Primary Router IP is 192.168.1.1)
   • Mask : 255.255.255.0
   • Gateway: 192.168.1.1 (again assuming Primary Router IP is 192.168.1.1)
   • DHCP Server: Disable
7. Local DNS: 192.168.1.1 (if IP of Primary Router is 192.168.1.1)
   • Assign WAN Port to Switch : Checked or Unchecked – your choice. See note on Linksys (prefers checked) below clock.
   • Save
8. Open Advanced Routing
   • set Operating mode to “Router”
   • Set Dynamic Routing interface to “Lan & Wlan”
   • Save
9. Open Services
   • uncheck Dnsmasq
   • Save
10. Open the Security -> Firewall tab
    • Uncheck all boxes…except Filter Multicast
    • Disable SPI firewall
    • Save
11. Open the Administration tab
    • APPLY Settings
12. Wait for the router to reboot, and then when you can access the webgui again, uplug the power and plug it back in.
13. Once you have it working, go to the wireless security tab, and set the same type of security AND key for both the primary and the repeater ssids and hit apply.
14. Open the Status -> Wireless tab and click Site Survey. Join your primary routers wireless network. You need to do this only once.
15. SET YOUR COMPUTER BACK TO AUTO IP AND AUTO DNS.

You should now be able to connect wired clients and wireless clients to the newly configured Secondary router. They will receive IP Addresses from the Primary Router and will be able to use the Internet connection supplied by the Primary Router.

Also take note of the fact that all repeaters, including this Repeater Bridge mode, will sacrifice half of the bandwidth available from the primary router for clients wirelessly connected to the repeater. This is a result of the repeater taking turns talking to not just one partner, but to two, and having to relay the traffic between them. As long as your internet bandwidth requirements are within this halved bandwidth amount there will be little or no reduction in “speed”.

source: http://www.dd-wrt.com/wiki/index.php/Repeater_Bridge

source: http://technet.microsoft.com/en-us/library/cc781949(WS.10).aspx

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Converting a Microsoft Access Database to an MDE File:

The situation may arise when you quickly need to secure and distribute a Microsoft Access database that also contains Microsoft Access VBA code. You will protect the database from editing by restricting the database users access to the design views, however you will need to allow the users to process their data as normal.

It may be that you haven’t got the time to fully create Microsoft Access User Accounts or to set Microsoft Access Security Permissions. By knowing what can and cannot be done by using the Microsoft Access MDE file format, will allow you to make a decision and to quickly release a secure database to the users.

Microsoft Access MDE File Format

The MDE file format is a special extension of the standard Microsoft Access MDB format, and is used to distribute an application. An MDE file compiles all of the modules, removes all editable source code and compacts the database. The resulting MDE file allows the database users to perform normal database operations, however it prohibits any changes from being made to the objects that support, or the code that runs the application.

Figure1: Creating an MDE File

Benefits of an MDE File

There are various benefits to be had by creating and distributing the database as an MDE file:

• Reducing the size of the database – the size of the database will be reduced due to the removal of the code, so memory usage is optimized, which will improve performance.
• Allowing VBA code to run, but protection from the code being viewed or edited.
• Security of objects without requiring additional Microsoft Access user-level security to be set.
• Allowing database users to update data and run reporting options without having to provide the full database.

Forms and Reports in an MDE File

By converting your Microsoft Access database into an MDE file you will prevent your database users from tampering with your VBA code. When a user accesses an MDE file, they cannot:

• View, modify or create Microsoft Access forms in design view.
• View, modify or create Microsoft Access reports in design view.
• View, modify or create Microsoft Access modules in design view.
• Add, delete or change references to databases or to object libraries.
• Change any VBA code – there is no source code available.
• Import or export any forms, reports or code modules.

MDE File Requirements

There are some requirements to saving your Microsoft Access MDB file as a Microsoft Access MDE file, and the following conditions apply:

• You must have password access to the Visual Basic code in the database.
• You must save all references to other Microsoft Access databases.
• You must have removed replication from a replicated database.
• If you want to remove user-level security options, you must do so prior to converting the file to the MDE format.
• If your database does have user-level security and you do need to preserve this, you must do:
  • Be a member of the workgroup that defines the user accounts used to access the database, or that was in use when the database was created.
  • Have Open/Run and Open Exclusive permissions for the database.
  • Have Modify Design or Administer permissions for any tables in the database, or be the owner of any of the tables in the database.
  • Have Read Design permissions for all objects in the database.

How to Convert a Microsoft Access Database to an MDE File

Once you have determined that you meet the above criteria for converting an Access database in MDB format to the MDE format, it is a simple process to make the conversion happen. You will need to perform the following actions:

1. If necessary, convert the database into the latest Microsoft Access version – if the file format is Access 2000 and you are working in Microsoft Access 2003 you will need to convert the database file format to Access 2003:
   1. From the Tools menu, choose Database Utilities » Convert Database » To Access 2003 File Format.
   2. Navigate to the database that needs to be converted and click OK.
   3. Enter a name for the database and click Save.
   4. Click OK to dismiss the message box.
   5. Open the database to confirm the name change.
2. Choose Tools » Database Utilities » Make MDE File.
3. Select the database to be converted and click Make MDE.
4. Confirm that the file has been converted to MDE and click Save.
5. Open the new file, and confirm that the Code toolbar is disabled and that the application works as expected.

source:  http://www.databasedev.co.uk/microsoft-access-mde.html ]]> http://www.pctechz.com/convert-mdb-to-mde-file-format/feed 0