[LI] two ques

[Sharad Joshi <sharadj@xxxxxxxxxxxxxxxx>]

Hio,

I posed these ques in different forums, but did not get any satisfactory
reply. I know this is not the best stage to raise these ques, but i am
sure any serious network software developer would be interested in these
at some point of time... Now the ques.

0.  *WHY* the *minimum* ethernet frame size is 64 bytes. Any rational  
    behind this? This means that *at-least* 46 bytes of data *must* be
    present in the ethernet frame. (Even if there is not much data, that
    *must* be appended with zeros to make it 46 bytes).

1.  *WHY* is a pseudo header used for calculating checksum in TCP/UDP
    headers. Is this not a overhead. Any specific reasons for this? RFCs 
    are silent on this.

If any one could point out some links, which shed more light on these,
that would suffice. I've already searched the net and various mailing
list archieves for the above questions without success. Thanks in advance
for any replies.

Sharad.
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