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Best firewall, router

Hi all,
I'm currently planning a network and need to know the best hardware solution for a firewall/router. The only hardware I'm familar with are el cheapo routers you buy at Staples. I will need something more robust that will handle traffic for upwards of 20 servers, 60-80 clients with one or two T1 data connections. I'm unsure of the amout of bandwidth we'll be using but it would be good to err on the high side. Would be running an Exchange server, possibly web server.

Things we need it to do:
SIP protocol support. Will be passing VOIP traffic through this.
Vpn connections

Want something that will work well in the future.

Would one box do all of this or would you need 2? Nat + Router? I'm unsure.

Please advise a networking newbie.

1 Solution
With your requirements, you have to go with Cisco. Model depends on your VOIP needs, 2800 series will do fine.
It can support voice modules, including T1 and have high throughput rate. Also it supports NAT of course ...

You can read more here: http://www.cisco.com/en/US/products/ps5854/

But its a pricy solution and you will need someone experienced with Cisco to design and install it.
My advice would also be a Cisco 2800 series for the 1+ T1's, but then I would add a Cisco PIX 515e firewall as my security layer that will do NAT for you and give you a hardware DMZ for your public servers. The new PIX 7.0 supports sip and Qos for the voip, and updates the PIX support for VPN's.

Agree with Leo that with all the features and functions of Cisco product, it's not a task for the novice to set it up right.

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