Richard L. Hamilton wrote:
I don't have much non-IP on my system, so I'm short on examples. But
there may be various software out there that does
non-IP based protocols such as NetBEUI, IPX/SPX, EtherTalk, RARP, X.25 level
3, the two types associated with PPPoE, etc. See
http://www.cavebear.com/CaveBear/Ethernet/type.html
and table A-1 in
http://www.cisco.com/univercd/cc/td/doc/product/wireless/airo_350/accsspts/ap350scg/ap350axa.pdf
another requirement might be to not only filter non-IP protocols, but to
filter any protocol (even IP) at a lower layer in the stack. this would
allow someone to deploy a filtering system that doesn't necessarily have
any IP interfaces configured (such as a layer-2 bridge that also does
layer-3 and above filtering, aka a transparent firewall).
-seb
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