How can I subnetting my network ?

[Supote Leelasupphakorn]

Hi, all

   I want to build a network as shown below.
All devices is in my responsibity except the
upsteam router. My question is 

   If I will assign public IP address to all 
   interfaces, is it neccessary that I must
   inform the upstream router's administrator 
   to add my subnet in routing table of upstream
   router ?

Or any comments are welcome.

     |-------------|
     |  Upstream   |
     |   router    |
     |     or      |
     |  gateway    |
     |-------------|
            |
            |
     |-------------|
     |   FreeBSD   |
     |   firewall  |
     |-------------|
            |
            |
   |-----------------|
   |  switching hub  |
   |-----------------|
     |            |
     |            |
|--------|   |--------|
| client |   | client |
|--------|   |--------|

Thanks in advance,
Pote


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