Re: Through FireWall

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#5448

From: Hans Galema
Date: Sun, 12 Sep 2004 10:54

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minoy wrote:
>  I actually want to know this :
>       A client(C) in LAN behind the Firewall/route(F) want to
>  connect to a Server(S) in WAN.Suppose that we use the UDP.
>       Now,Client connects to Server directly use S's IP,and
>  Send a Message To Server,
> The Server receive the Client's Message,then Send the response Message to Client,Now,
> I confused,The Server must connect to Client 

No. Why are you thingking so ? The client just connected to the server
using the port where the server is listening on. The communication
then goes over a different port indeed. That port is proposed by the
client. The IP is the IP as seen by the server.

 > use Firewall's IP,But use Which Port?

You have no influence on the proposed port(number). As far as I know:
when a client can connect with the server than the recommunication
will be ok too. Do you have other experiences?

> If they connect next time,does the Port change?

The communication port can be different each time yes.

Hans.

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Date: Sun, 12 Sep 2004 12:54:48 +0200
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