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The firewall you choose should be based primarily on the level of needed security, budget, reliability and the potential need to expand the wireless network. The most basic firewall, with minimal security is one that is part of a basic wireless router. The next level up is a dedicated firewall. After that comes a dedicated firewall device with a gateway. Finally, the highest level of wireless security is a dedicated firewall device (such as a computer) with a combination of proxy firewall and full packet filtering.