/2019CSECNU-Computer-Network-01

Primary LanguageJava

Computer-Network-Term-Project

Routing Table
Destination : Byte[4]
NetMask : Byte[6]
GateWay : Byte[4]
Flag : Boolean[3]
Interface : String
Metric : Int
ARP cache
Interface : String
IP Address : Byte[4]
Ethernet Address : Byte[6]
Status : Boolean
ARP Layer에 static filed로 설정
Proxy ARP
Device Name : String
IP Address : Byte[4]
Ethernet Address : Byte[6]

Header

IP Header ( 20 Byte )
Version : 4 bit (4로 고정)
Header LengthHLEN : 4 bits
Type Of Service : 1 Byte
Total Packet Length : 2 Byte
Fragment Identifier : 2 Byte
Fragmentation Flag : 3 bits
Fragmentation Offset 13 bits
TTL : 1 Byte
Protocol Identifier : 1 Byte
헤더 체크섬 : 2 Byte
Source IP : 4 Byte (12 번째 부터)
Destination IP : 4 Byte (16 번째 부터)
Ethernet Header (14 Byte)
Destination : 6byte
Source : 6Byte
Type : 2Byte
ARP Header (28 Byte)
HW Type : 2 Byte
Protocol : 2 Byte
HW Length : 1 Byte
Protocol Length : 1 Byte
Opcode : 2 Byte
Sender Mac : 6 Byte
Sender IP : 4 Byte
Target Mac : 6 Byte
Target IP : 4 Byte

2분 동안 Wait, 응답 없으면 캐시 지우기 2분안에 응답이오면 10분동안 캐시 저장

summary