linksys wrt54GL as firewall

Any router does fine as a port firewall, but you still need a good application firewall. malicious code can be sent or received over port 80.
 
Most Modern routers have SPI which checks to make sure that all the data coming into your network was requested and that none of the packets were forged. Also NAT too could be considered a sort of firewall, which most modern routes have also
 
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