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by noselasd
3229 days ago
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At least with IPv4 you can easily compute the start of layer 4, it's just ipv4[0]&0xf * 4 - trivially implemented with little real-estate in hardware. IPv6 requires you to loop through all extension headers to reach layer 4, and you need to know about a handful of those extension headers as not all follow the same format. |
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