filtering out 802.3 packets

[Anonymous]

anyone know of a tool that I could install that would filter out all
802.3 traffic?

I'm on a heavily used SNA network and I want to isolate a segment
from that traffic.

I could put in a router, but I don't want to introduce the delay of a
routing decision.  Ultimately, I'm looking for a transparent bridge
type of device that will block certain ethernet types.

Please let me know.

--glen
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