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cc: Supote Leelasupphakorn <pjn0211@yahoo.com>
Subject: Re: How can I subnetting my network ?
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>    If I can't tell the upstream router's administrator,
> is there other way to make all of client behind firewall
> to able to comminucate with other on internet.

How big is your subnet, i.e., how many public IPs has your ISP provided you?
If it's only one, you'll need to use NAT and a private address range for
your client network. If you have been given many IPs, look again at the link
I had previously posted.