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Lab3-ARP (Address Resolution Protocol)

Lab3-ARP (Address Resolution Protocol). Date:2007.11.02. Address. MAC address or Ethernet address 硬體或介面卡的位址，出廠時唯一，燒錄在介面卡的 ROM 中 以 aa.bb.cc.dd.ee.ff 六個位元組表示 IP address TCP/IP 協定所訂位址，經申請後唯一 以 aaa.bbb.ccc.ddd 四位十進位數值表示. OSI 分層資料交換. Ethernet 框架. Ethernet 標頭. ARP 內容. Ethernet 標尾.

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Lab3-ARP (Address Resolution Protocol)

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  1. Lab3-ARP(Address Resolution Protocol) Date:2007.11.02

  2. Address • MAC address or Ethernet address • 硬體或介面卡的位址，出廠時唯一，燒錄在介面卡的ROM中 • 以aa.bb.cc.dd.ee.ff六個位元組表示 • IP address • TCP/IP協定所訂位址，經申請後唯一 • 以aaa.bbb.ccc.ddd四位十進位數值表示

  3. OSI分層資料交換

  4. Ethernet框架 Ethernet 標頭 ARP 內容 Ethernet 標尾 Preamable and SFD 目的位址 來源位址 type Data CRC 8 Bytes 6 Bytes 6 Bytes 2 Bytes 46~1500 Bytes 4 Bytes ARP type:0x0806

  5. ARP (Address Resolution Protocol) • 位址解析協定 • RFC-826 • Mapping between IP address and the physical address (MAC address).

  6. MAC與IP位址的轉換 ARP Request 1A-23-F9-CD-06-9B IP:140.125.33.1 Host A 88-B2-2F-54-1A-0F IP:140.125.33.254 5C-66-AB-90-75-B1 IP:140.125.33.2 Host B 49-BD-D2-C7-56-2A IP:140.125.33.3 ARP Reply Host C

  7. MS-DOS and Ethereal • MS-DOS ipconfig /all • MS-DOS arp –a顯示arp table • MS-DOS arp –d清除arp table • Filter：arp && eth.addr == 00:14:85:f9:e6:6e

  8. ARP Packet format • 硬體種類(Hardware type)：2個位元組，使用Ethernet時，填入0x0001。 • 協定種類(Protocol type)：2個位元組，使用IPv4協定時，填入0x0800。 • 硬體長度(Hardware length)：1個位元組，定義實體位址的長度，使用Ethernet時，填入0x06。 • 協定長度(Protocol length)：1個位元組，定義邏輯位址的長度，使用IPv4時，填入0x04。 • 運作(Operation)：2個位元組，定義封包種類，ARP Request填入0x0001，ARP Replay填入0x0002。 硬體種類 協定種類 硬體長度 協定長度 運作 來源端MAC位址(6個位元組) 來源端IP位址(4個位元組) 目的端MAC位址(6個位元組) 目的端IP位址(4個位元組)

  9. ARP Request (Boradcast) Host A Host C 49-BD-D2-C7-56-2A 1A-23-F9-CD-06-9B IP:140.125.33.3 IP:140.125.33.1 0x0001 0x0800 0x06 0x04 0x0001 0x1A23F9CD069B 0x8C7D2101 0x000000000000 0x8C7D2103 Preamable and SFD 0xFFFFFFFFFFFF 0x1A23F9CD069B 0x0806 Data CRC

  10. ARP Repay(Host C  Host A) Host A Host C 49-BD-D2-C7-56-2A 1A-23-F9-CD-06-9B IP:140.125.33.3 IP:140.125.33.1 0x0001 0x0800 0x06 0x04 0x0002 0x49BDD2C7562A 0x8C7D2103 0x1A23F9CD069B 0x8C7D2101 Preamable and SFD 0x1A23F9CD069B 0x49BDD2C7562A 0x0806 Data CRC

  11. function • Interrupt_Initialize(); • WanInitialize(); • LanInitialize();

  12. function • int SendPacket(U8* Data, int Size, int M_channel) • * Function : SendPacket • * Description : Send ethernet frame function • * Input : frame data pointer, frame length • * Output : transmit ok(Size) or error(0)

  13. function • int mac_get_packet(U8 *buf, int rx_length, int M_channel) • * Function : ReceivePacket • * Description : Receive ethernet frame function • * Input : frame data pointer, frame length • * Output : transmit ok(len) or error(0)

  14. 實習 • 撰寫ARP協定網路程式，送出ARP Request到目的端電腦，當目的端電腦回傳ARP Reply時，將目的端電腦的MAC address顯示出來。 • 基本功能：顯示MAC address。 • 擴充功能：介面愈友善，分數愈高。

  15. 報告內容 • 報告的格式自由發揮,但至少要有底下幾部分： • 題目講解及實作原理 • 程式流程圖 • 部份程式碼及註解說明 • 問題與討論 • 心得感想

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