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My brother gets malware infections practically every week. Apparently he had a infection over the past 24 hours, I only noticed it because I checked the router logs and saw a massive amount of network traffic on his MAC address.

How can I limit the damage on the network when this happens? I try to educate him but nothing ever sticks. I even set up auto updates, EMET, antivirus, OpenDNS familyshield and a few other things but he always manages to get infected. I usually just MAC block him or egress the bandwidth to 1kbps when I see a ton of traffic until I can physically check the computer.

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You answered your own question already: Block access in the router based on his computer's MAC address(es). Perhaps you mean another type of isolation (which?)? –  Steven Volckaert May 1 at 6:35
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To prevent other computers from getting infected i would suggest putting him in a DMZ –  BadSkillz May 1 at 8:20
    
As BadSkilz suggests isolate him with a router between the rest of your internal network and him. –  zedman9991 May 1 at 13:03

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If your router has the features you could create a separate vlan and isolate his computer in that using firewall rules. Other than that MAC address filtering is really the only way.

However what I would do is ban him from your network. He won't learn his lesson because he has you providing free tech support whenever he makes a mess. Kick him off for a week, then limit his access to some very basic sites for another week or so. Charge him for tech support. He'll get the message or take his activities elsewhere.

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+1 He won't learn if he experiences no failure. If you keep fixing it, he'll keep breaking it... –  schroeder May 1 at 15:58

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