TCP/IP Header

Onno W. Purboonno@indo.net.id

User Internet Biasa ..

Referensi http://www.ietf.org http://www.sans.org http://rr.sans.org

Topologi Sebuah Paket Data

TCP Header

Contoh Aplikasi di atas TCP Mail SMTP - port 25 Mail POP3 - port 110 Web HTTP - port 80

IP Header

Format Type of Service (ToS) Bit 0-2 Precedence

111 Normal Control 110 Internetwork Control 101 CRITIC / ECP 100 Flash Override 011 Flash 010 Immediate 001 Priority 000 Routine

Format Type of Service (ToS) Bit 3 Delay

0 normal delay 1 low delay

Bit 4 Throughput 0 normal throughput 1 high throughput

Bit 5 Reliability 0 normal reliability 1 high reliability

Bit 6-7 Reserved

Flag R bit 0 is reserved & must be zero DF bit 1: don’t fragment bit

0 may fragment 1 don’t fragment

MF bit 2: more fraqments bit 0 last fragment 1 more fragment