Is my Actiontec DSL modem or Cable/DSL router a firewall?

Yes, the Actiontec DSL modem and Cable/DSL router acts as a firewall. They provide security through "Stateful Packet Inspection" or SPI, which inspects incoming data packets to make sure they correspond to an outgoing request. Unsolicited packets (which could be harmful) are rejected. Through the use of specific firewall settings, the firewall can be configured to block outgoing as well as incoming traffic.

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