ICS question

[serge calderara]

Dear all,

does anyone can explain me what really happen in the host
side when we activate Internet sharing?

And in client side, how explorer know which ICS server to
coonect fro ICS, how the connection process is working

thanks for your answer
regards

 

[Steven Umbach]

The term generally used is NAT - network address translation, while PAT - port
address translation is actually more accurate. Basically what happens is the
ICS/NAT device keeps track of traffic flow by assigning port numbers to keep
track of which internal computer the traffic belongs to, kind of like a phone
extension to a main number though not necessarily permanently assigned. The
client sends all non local network traffic [such as to the internet] to the
ICS/NAT device based on that device being configured as it's default
eway. --- Steve

http://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/w
inxppro/deploy/nattrnsv.asp

 

[m.Abolhasani]

Dear serge calderara
As i understood you need some information about Internet
connection sharing in Windows.
To provide users in a workgroup to access to the Internet
we usually use ICS.
To do this you must enable ICS in the advanced properties
of your internet connection then change your LAN IP to
192.168.0.1 and automatic IP of the other computers.
Now when each computer requests an IP ICS submit it an IP
form 192.168.0.x.Here your ICS is as a router that route
your clients requests to the internet.
If you need more information about ICS or any kinds of
Microsoft netwroks you can ask me via
(e-mail address removed)

 

[Michael Johnston [MSFT]]

When you enable ICS, this enables the NAT protocol which is how you get through. NAT performs a network address
translation on packet destined to the Internet. It swaps out the private IP address of the source and plugs in the public IP
address of the ICS host and sends the packet to it's destination. ICS keeps a table of all these sessions so that when packets
come inbound, it can then perform the exact opposite process, removing the public destination IP and plugging in the private IP
of the destination based on the mapping table.

As far as clients go, ICS enables DHCP on the ICS host. Clients behind the ICS host will get a DHCP address which includes a
default gateway and DNS entries. The default gateway is what clients use to route traffic destined to the Internet through ICS.
This is how clients "Know" about the ICS machine. Clients really don't know that its a ICS host, they just know they have a route
out through this box. This is a extremely simplistic view of how it works but gives you the jist of it.

Thank you,
Mike Johnston
Microsoft Network Support
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