Does Firewall do SPI?  If not, what does it do?

Does Time Capsule have a firewall? Does it do SPI? What else does qualifies it as a firewall? NAT isn't really much protection? Would it be better to put TC upstream of a router that has a true firewall?

NAT firewalls _+*DO NOT*+_ do SPI. Please research the differences.
NAT simply opens IP addresses and ports, it does not track any information crossing the translation.
SPI does track the session information to validate that the response was part of an existing session flow.
Hackers attack cable modems all the time. It is a great place to hack into PC's that are unaware of the threat, then turn those PC's into attack tools to create distributed denial of service (DDoS) attacks.
As far as resetting the router, you will likely obtain the same IP address during a router reset, unless there is an extended amount of time that the router is powered off. The DHCP server lease time, would have to expire during the power down interval, and the router IP address would have to be returned to the DHCP pool.
Cisco, Linksys, Linux based - there are a lot of firewalls out there. Please make sure you are using a SPI firewall on your system at a minimum.

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