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I need to deploy a firewall to two large office (~ 100 &amp;&nbsp;500 users) respectively and several small branch office, from 5 - 20 users.<br />
<br />
Basic function<br />
1. support web access filter and block messengers like MSN, Skypei, Yhaoo messenger ,etc Ideally, it supports different blocking list based on different group. <br />
<br />
2. can review real time packet flow and apply access-list to block if needed. Ideally, it can identify L3 / L4 activities.<br />
<br />
3. Two large offices will need to have IDS support.<br />
<br />
Under different requirement for different countries, what band of product can fullfil the need ?<br />
<br />
Thanks
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I need to deploy a firewall to two large office (~ 100 & 500 users) respectively and several small branch office, from 5 - 20 users.

Basic function
1. support web access filter and block messengers like MSN, Skypei, Yhaoo messenger ,etc Ideally, it supports different blocking list based on different group. 

2. can review real time packet flow and apply access-list to block if needed. Ideally, it can identify L3 / L4 activities.

3. Two large offices will need to have IDS support.

Under different requirement for different countries, what band of product can fullfil the need ?

Thanks

Firewall deployment

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.