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by tptacek
2716 days ago
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If I remember correctly, the big thing about EDNS is that DNS UDP datagrams were originally restricted in size to a total length that would be unlikely to see IP fragmentation on a network of 1980s hardware, meaning that in practice DNS packets had to be much smaller than the maximum reasonable size of an IP packet. In addition to setting up extended options, EDNS0 also allows DNS packets to be large. |
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