(Internet Protocol, IP)
2
-83
..
. ..
1. .
2. .
3. .
.
453.
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3.1. , .
3.2. .
453. IP- 192.168.128.66 IP- 192.168.128.69.
3.3. .
Version , 4 , 4 - 0100.
Header Length 32- , 5 (20 ), 15 (60 ).
DSCP - , ; IP Precedence Type of Service, 8 .
Total Length ( + ) , 16 ( 65535 ).
Identification , 16 .
Flags : , 3.
Res (), 0.
DF .
MF (MF=0) (MF=1) .
Fragment offset - , 13 , 8 .
Time to live , 1.
Protocol , ( ) : ICMP (Prot=1), TCP (Prot=6), UDP (Prot=17), SIP (Prot=41)
Header checksum - , 16 . , 16- , , .
Source - , 32 .
Destination - , 32 .
3.4. , .
: ; .
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3.5. .
1. ?
: 4 Version/IHL = 0x45, 4 , 4 .
2. ?
: 4 Version/IHL = 0x45, 5 , 5 32- : 5*32 = 160 ÷ 8 = 20 . . 20 , .
3. 453?
: Total Length = 0x00b9 = 185 .
4. , - ?
: MF=1 ,
Fragment Offset . (FO=0), .. , .
5. () 453?
: Time to Live = 0x80 = 128.
6. 453 IP- - .
: Source = 0xc0a88042 192.168.128.66.