Help!! ICS(Internet Connection Sharing) goes wrong

{I'm here. So if you posted it, I will reply you as soon as possible}
2. The client computer cannot be online properly by ICS.
It can connect to SOME websites only, not all.
Examples of unaccessible websites:
- www.altavista.com
- www.yahoo.com.hk
- www.sohu.com
and quite a few... etc.


The configuration and settings (very long. You may read some parts only):
=============================================

Hardware and Software Configuration
Main/Host Computer
- Desktop Computer
- OS: Win XP Pro
- 2 LAN (I call it LAN-M1, LAN-M2)
- 1 straight cable is linked from ASDL modem to LAN-M1
- 1 cross-over cable is linked from LAN-M2 to my client computer
- Norton Anti-Virus installed
- Norton Internet Security installed

Client Computer
- Notebook Computer
- OS: Win XP Home
- 1 LAN (I call it LAN-C)
- Norton Anti-Virus installed
- Norton Internet Security installed

ISP broadband company:
- Family 3Mbps ADSL Modem


The setting in "Control Panel | Network Connection"
In Main/Host Computer
LAN network:
LAN-M1
I have clicked the following:
- Client for MS Netowork
- File and Printer Sharing for MS Netowork
- QoS Packet Scheduler
- Internet Protocol
In IP setting:
- Automatically get IP
- Auto get DNS
In Advanced Tab:
- turn on: Internet Connection Firewall
- Clicked: Allow other network users to connect through this computer's Internet
connection
- NOT clicked: Allow other network users to control or stop Internet connection
sharing

LAN-M2
I have clicked the following:
- {same as above, ie Client for MS Netowork...}
In IP setting:
- IP address: 192.168.0.1
- SubNet Mask: 255.255.255.0
- Default Gateway: {empty}
- Usual DNS: 202.61.98.227
- Other DNS: 202.61.97.235
[The DNS value is from PPP adaptor Family. I found it by running command and
input "ipconfig /all"]

In Advanced Tab:
- Unavailable (ie grey out): Internet Connection Firewall
- Unavailable: Allow other network users to connect through this computer's
Internet connection
- Unavailable: Allow other network users to control or stop Internet connection
sharing


Broadband:
Family
In Network Function Tab
I have clicked the following:
- {same as above, ie Client for MS Netowork...}
In IP setting:
- Automatically get IP
- Auto get DNS
In Advanced Tab
- Clicked: Internet Connection Firewall
- Clicked: Allow other network users to connect through this computer's Internet
connection
- Unclicked: Establish a dial-up connection whenever a computer on my network
attempts to access the Internet
- Unclicked: Allow other network users to control or stop Internet connection
sharing


In Client Computer
LAN-C
I have clicked the following:
- Client for MS Netowork
- File and Printer Sharing for MS Netowork
- QoS Packet Scheduler
- Internet Protocol
In IP setting:
- Automatically get IP
- Auto get DNS
In Advanced Tab:
- turn on: Internet Connection Firewall
- Unavailable: Allow other network users to connect through this computer's
Internet connection
- Unavailable: Allow other network users to control or stop Internet connection
sharing


The setup wizard I have run:
In Host computer
- Go to "Start | Program Files | Accessories | Network Installation Wizard"
- Choose "This computer directly connects to the Internet..."
- Choose "the Broadband one" (ie Family)
- Give the computer a unique name (NB: it is NOT the same name as all other
comp)
- Give the workgroup a name (NB: All comp use the same workgroup name
- Done!

In Client computer
- Go to "Start | Program Files | Accessories | Network Installation Wizard(ºô¸ô
¦w¸ËºëÆF)"
- Choose "This computer connects to the Internet by another computer..."
- Give the computer a unique name (NB: it is NOT the same name as all other
comp)
- Give the workgroup a name (NB: All comp use the same workgroup name
- Done!


Point to note:
- The following message never appears during the configuration of LAN/broadband:
"When Internet Connection Sharing is enabled, your LAN adapter will be set to
use IP
address 192.168.0.1. Your computer may lose connectivity with other computers on
your network. If these other computers have static IP addresses, it is a good
idea to set them to obtain their IP addresses automatically. Are you sure you
want to enable Internet
Connection Sharing?"

- No matter I enable / disable Norotn Internet Security(NIS), the problem still
occurs.
I never make a particular settihng in NIS regarding the ICS and its small
network.


Thanks for reading.