Why does tcpdump only capture the first 68 bytes of a packet?

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TCPDUMP has a default capture limit of 68 bytes, chosen to capture essential packet header information while avoiding exposure of user data. This default setting serves as a useful network diagnostic tool. Users can adjust this limit to capture the entire packet by using the "-s 0" option, allowing for more comprehensive analysis when needed.
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By default TCPDUMP limits the number of bytes it captures to 68. Why did they select 68 bytes? Does anyone know why?
 
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68 bytes is just the default value. You can set it to capture the whole packet by using the "-s 0" option. It's set to that by default because it's just enough to capture packet header information without revealing content; making it a useful network diagnostic without snooping through user data.
 
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