******************************
            Section A. UPGRADE INSTRUCTION
            ******************************

For users of Microsoft Windows, please run D253B6.EXE
directly. It will search the Router on your LAN and ask
you to type system password. Just type in the password
and click "Upgrade" button. It takes about 30 seconds
to finish the whole procedure.

For users of other platforms, please refer Section D for
platform-independent upgrade.


            ******************************
            Section B. UPGRADE INFORMATION
            ******************************

The files will upgrade the firmware of your Cable/DSL 
Router to version 2.53 build 6.

1. NOTE! DO NOT POWER OFF THE UNIT WHEN THE UNIT IS BEING
   UPGRADED, OR THE UNIT MAY BE DAMAGED.

2. The configuration will not be changed. You need not
   configure it again.


               *************************
               Section C. CHANGE HISTORY
               *************************

*** V2.53b1 TO V2.53b6

1. Fix a security hole that was reported by:

     Matt Bing
     Anzen Computing, Inc.
     http://www.anzen.com

2. Solve the connection problem of Adelphia

3. Fix a bug that causes IP address renew problem

*** V2.52b6 TO V2.53b1

1. Support configuration backup and restoring. To backup,
   please click "Backup Setting" button on "Tools" pages.
   To restore, just *Upgrade* the saved file.

2. Support one non-standard FTP port. Please configure
   the non-standrad FTP port on "Misc Items" pages. This
   feature is useful when you have to access an FTP server
   whose port number is not 21.

3. Increase the number of Virtual Servers to 20.

4. Fix a bug that cause connection problem of NetScreen-
   Remote.

*** V2.52b4 TO V2.52b6

1. Support PPPoE with static IP address

2. Improve multi-session IPsec support

*** V2.51b5 TO V2.52b4

1. Improve IPSec pass-through support. No configuration
   is needed to connect to IPSec VPN server. To host an 
   IPSec VPN server on the private network, configure
   port 500 as Virtual Server.

2. Support more IPSec sessions (8) and PPTP sessions (8).

3. "Renew IP Forever" will also automatically connect to
   ISP when the connection is broken.

4. Improve the PPPoE compatiblility.

5. Fix a bug of DHCP client.

6. Add DNS setting for PPPoE

*** V2.50b9 TO V2.51b5

1. Add web-based upgrade feature.

2. Add "Reset to Default" button.

3. Support mIRC DCC Chat & Send.

4. Increase the max length of user name to 53 characters
   for PPPoE and Dial-Up Network.



     ************************************************
     Section D. Platform-independent Firmware Upgrade
     ************************************************

First, go to the D-Link Web site to download firmware image
file, D253B6.BIN. Remember the location you save this file.
And then choose one of the following two methods: (firmware
version 2.50 does not provide Web upgrade)

* METHOD I: WEB UPGRADE

1. Connect the Web user interface and login as system
   administrator.

2. Click the "Firmware Upgrade" button of "Tools" page. 
   And the "Firmware Upgrade" screen will appear.

3. Enter the location of the previously downloaded file in 
   the text box, or click "Browse" button to search for the 
   file. And then click "Upgrade" button.


* METHOD II: FTP UPGRADE

  Use any FTP client you preferred to upload the downloaded
  files.

  The username to login the FTP server is "root" and the 
  password is the same as the system administrator's. The
  default setting is "admin".

  Close the FTP session when the files are uploaded. It
  takes about 30 seconds. After the session is closed, the 
  router will be restarted automatically.

Illustration on Linux system:

  [Linux]$ ftp 192.168.0.1
  Connected to 192.168.0.1
  220 FTPd 1.6
  Name (192.168.0.1:rupert): root
  331 Password required
  Password:
  230 User root logged in
  Remote system type is UNIX.
  Using binary mode to transfer files.
  ftp> put D253B6.BIN
  local: D253B6.BIN remote: D253B6.BIN
  200 Port command successful
  150 Opening data connection
  226 Upgrade complete.
  129486 bytes sent in 0.257 secs (4.9e+02 Kbytes/sec)
  ftp> bye
  221 Rebooting