Discussion in 'Cisco/Linksys Wireless Routers' started by badrottie, Aug 21, 2005.
I am curious if it have SPI where do I find it? does it enable by default?
There is not a single definition of SPI. SPI is being used as buzzword for all kinds of packet filtering/inspection above the level of simple TCP/IP routing and filtering.
The WRT54G is using iptables for port forwarding, routing and firewall purposes. iptables has some SPI features like the --state ESTABLISHED,RELATED switch.
Most thrid party firmwares like Alchemy, DD-WRT and Talisman have enhanced protcol based blocking and QOS features using L7 filters.
This is also some kind of SPI.
And the IPSec/PPTP/L2TP passthrough feature, that can be found in the webinterface is also sort of SPI.