.


:




:

































 

 

 

 


ICMP




 

  -
 
 
 
0
1
2
3
4 , (DF)
5
6
7
8
9
10
11 ToS
12 ToS
13
14
15
  ( )
 
0
1
2 (TOS)
3
 
 
  -
  (RFC-1256)
0
16
  (RFC-1256)
  ( )
0 (TTL)
1 ( )
  ( : IP- )
0
1
2
 
 
 
 
  (RFC-950)
  (RFC-950)
  ( )
20-29 ( )
  (RFC-1393)
  (RFC-1475)
 
  IPv6 Where-Are-You ( )
  IPv6 I-Am-Here ( )
 
 
  (Domain Name Request)
  (Domain Name Reply)
  SKIP
  Photuris

 

0
1 (Unkown Security Parameters Index)
2 , (Valid Security Parameters, but Authentication Failed)
3 , (Valid Security Parameters, but Decryption Failed)
4 (Need Authentication)
5 (Need Authorization)  
41-255




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