Intrusion Analyst Packet Header Chart

IP and UDP

Copyright © Guy Bruneau, 2000-2001. All rights reserved.
 

4

5

00

0044

4-bit version

4-bit header length

8-bit type of service (TOS)

16-bit total length (in bytes)

4615

4000 (DF) or 2000 (MF)

16-bit identification

3-bit flags

13-bit fragment offset

40

11

d70d

8-bit time to live (TTL)

8-bit protocol

16-bit header checksum

c0a8 1e01

32-bit source IP address

8009 401a

32-bit destination IP address

Options (if any)

0035

0035

16-bit source port number

16-bit destination port number

0030

7a8a

16-bit UDP length

16-bit UDP checksum

a6ff 0000

Start of Data (if any)


 
 

TCPDump trace (20 bites IP header [without options] + 8 bites UDP header)


21:43:38.809994 seeker.domain > blackhole.isi.edu.domain: 42751 PTR? 3.0.17.10.in-addr.arpa. (40)

4500 0044 4615 0000 4011 d70d c0a8 1e01

8009 401a0035 0035 0030 7a8a a6ff 0000

0001 0000 0000 0000 0133 0130 0231 3702

3130 0769 6e2d 6164 6472 0461 7270 6100

000c 0001


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