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I have been seeing an unknown MAC id on HOMECARE antivirus history. That MAC id is blacklisted in the filter but it still shows up (I was told it isn't too hard to bypass it), and the description of the security issue doesn't sound benign. Here is a screen shot of the antivirus history from the HOMECARE option. I'm not too experienced in router security... any idea what's going on? Thank you in advance.

Model: Archer 2300 w/ latest firmware. V.1.0