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prashmit

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Selection of Firewall and IDS

We are going for a 30 sites networking with our head office via some ISP's VPN. Can all experts pls suggest me what firewall and IDS should I use to protect my network to maximum extent. We have Windows 2000 advanced server with Exchange 2000 as mail server. We will expose our server for ERP and mail access to all our sites as well as for external internet users. (To note we are taking a leased connectivity with ISP for internet exposure). We will be using 3600 series CISCO routers at central location.
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prashmit

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Thanks to all. Let me go through. Will come back very soon.
Can all please tell me what features of firewall and IDS should we consider for evaluation.
Like firewall should have deny all port and allow few capability,, etc.
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So far the Sonicwall Global Management System is the easiest I have seen to configure. The Pro 330 devices support 128,000 simultaneous connections 1000 VPN tunnels. Firewall throughput is 190Mbps and VPN throughput is 45Mbps. They have higher-end products that support up to 10,000 VPN tunnels and 500,000 Simultaneous connections, but they are very pricy and most people do not require that many.
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You could also try Snort 2.0 as it is free and very effective.
Please remember to be realistic here,  prashmit is only connecting 30 sites.
As a rule of thumb - check out what the free linux firewall and vpn solutions (IPTables and Freeswan) provide - if the commercial packages you look at don't give you at LEAST that, then they are a waste of money.
I will get back to u all very soon. Thanks to all for help and co-operation.
Split between all posters.
Yep, good suggestion.