A bit of this, a byte of that..... :->
Rats, I can't find the RFC. Good thing I have my Radcom world of Protocols
book at my side.
IP is a 20 byte header that contains:
Version number - 4 bits
Internet header length - 4 bits ( length of the header itself. Minimum of
5x32 bit words. I.e. 20 bytes )
Type of service - 8 bits
Total length - 16 bits ( how large a data packet follows the header )
I.D. 16 bits ( used for packet reassembly )
Flags - 3 bits used in the fragment / don't fragment determinations )
Fragment offset 13 bits ( indicates where a fragment belongs in a
sequence )
Time to live - 8 bits
Protocol - ip protocol types defined by ietf. For example, IPSec AH is type
50
Header checksum - 16 bits
Source address - 32 bits ( ip)
Destination address 32 bits
Options - variable length
Padding - variable length
These last two add up to the remaining value - 32 bits.
No mac - that's layer two. IP is layer three. TCP is layer 4
HTH
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Luan
Kim
Sent: Wednesday, August 16, 2000 3:11 PM
To: [EMAIL PROTECTED]
Cc: Naasief Edross
Subject: question on ip packet
Can someone lighten me up as to what's inside an "ip packet"? Is there a
udp/tcp header in it? Is there a mac-address in it? Thanks for any
input.
********************************************
Luan T. Kim, MCSE, CCNA *
Systems/Network Infrastructure Engineer *
MP3.COM, INC. http://www.mp3.com *
Phone: 858-623-7341 Cell: 858-382-3055 *
Fax: 858-623-7400 Email: [EMAIL PROTECTED] *
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