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Question about the Firewall loadbalance

I have a case in constructing a City Broadband Network.

Now I have two CSS 11800 and 4 PIX firewall,the Customer wants 4 PIX 535/525 to do NAT to translate the private ip address to Public address at 2 export. I want to know if one CSS 11800 can handle two firewall loadbalance while the PIX do the NAT.I tried to do them as Server Loadblance but failed. Beacause I cannot make so many Vip address as the Public address.Is there any other way to solve the problem?

If they cannot ,I guess if 2CSS can handle 2PIX while two firewall loadbalance while the PIX do the NAT ?I found the doc. of the CSS advanced config ,Chapter of PIX firewall loadbance .In the Chapter it noted that the PIX cannot do the NAT. So can anybody give me the Help ? i really need the exactly detailed configuration ,Thanks .

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