Why the default ping frame size is 74 bytes ?

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Networking
Why the default ping frame size is 74 bytes, why can't it be 64 bytes  ? Is there any standard or reason behind it ?
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  • ToddN2000
    There is a lot of info on the net and it can be a bit confusing. Is there a problem you are having with the size incoming or outgoing? We need a few more details.

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  • ToddN2000
    Messing with the ping frame size can cause problems. A correctly-formed ping packet is typically 56 bytes in size, or 64 bytes when the Internet Protocol header is considered
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  • john79
    I am just curious to know is there any standard for the ping payload size, if its is 74 then payload will be of 32 bytes. But in Linux and other devices its varies to 56 and 36 etc.. so confused, and want to know what could be the standard and default size of the icmp data size for a ping request packet.
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  • john79
    So if 64 bytes do you consider only IP header or Ethernet header will also be included ? In that case data size will vary
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  • TheRealRaven
    The 74 bytes comes from:
    • 6 bytes DA + 6 bytes SA + 2 bytes Type + 20 bytes IP header + 4 bytes ICMP header + 4 bytes identifier+sequence number + 32 bytes actual data = 74
    Of course, there may be other bits/bytes considered such as a CRC. But what is the problem? Different ping implementations provide extra capabilities such as specifying packet size. Does it matter for you?
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  • john79
    Ok, does that means for a ping request there is no defined default data size, it can be varying based on each implementation. Since I got confused  by an earlier post mentioned below which says Ping has a default frame size of 74 bytes.
    "Minimum-and-maximum-Ethernet-frame-sizes" 
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