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Why is rat splatting packets with TTL 0 onto my network?

April 26, 2017Network packets Rat splatting TTL

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Why is rat splatting packets with TTL 0 onto my network?

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There is a known bug in the Microsoft’s IP stack which means that TTL zero IP packets (such as those used in the mbus) escape onto the network. There is a hotfix for Windows NT 4.0 (ask Microsoft technical support about article Q234980 in the Microsoft Product Support Services Knowledgebase), but no fix exists for other versions of Windows. It is believed that Windows NT 4.0 service pack 6 and Windows 2000 also fix this problem.