Hi
I am new to the DataCom related protocols, I have small confusion in IPv4
and TCP headers.
All we know IHL ( IPv4 Header length field in IPv4 header) and
ataOffset( field in TCP header) are four(4 bit) bit fields.
IHL ------> IHL is the Total IPv4 header length, maximum is 15
( 15x4 = 60 bytes) ----refer RFC 791
DataOffset ------> DataOffset is total TCP header size ( in simple words)
, maximum is 15 ( 15x4 = 60 bytes) ----refer RFC 793
From above two, combined TCP/IP header maximum length is 120 bytes.
But in RFC 1144 (page 13) , it was defined as 128 bytes. Is it correct? If
so please clarify the same.
If I am wrong please correct me.
Thanks in advance.
With Kind Regards,
Ramana Divvi.
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