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ipmacaddresstranslation-資料下載頁

2024-10-12 15:41本頁面

【導讀】Outline. ARP. RARP. DHCP. CS6402. –ConfiguredinOS. work. –Ether’s48bitMACaddresses. CS6403. addresses. –Destinationhost. –Nexthoprouter. leveladdress. Howisitmaintained?CS6404. addressbindings. table. CS6405. ARPImplementation. ARPPacketDetails. Notes. CS6406. ARPPacketFormat. TargetHardwareAddr(bytes2–5). TargetProtocolAddr(bytes0–3). SourceProtocolAddr(bytes2–3). Hardwaretype=1ProtocolType=0x0800. SourceHardwareAddr(bytes4–5). TargetHardwareAddr(bytes0–1). SourceProtocolAddr(bytes0–1). HLen=48PLen=32Operation. SourceHardwareAddr(bytes0–3). 081631. CS6407. machines. address. CS6408. reliability

  

【正文】 rver – Sends DHCPREQUEST message to server which responds with DHCPACK ? Client is then in BOUND (normal) state CS 640 13 DHCP Implementation contd. ? From BOUND, client can issue DHCPRELEASE and return to INITIALIZE state – This is simply client deciding it no longer needs the IP ? When lease reaches 50% of lease expiration time, it issues DHCPREQUEST to extend lease of current IP with server and moves to RENEW state – Receipt of DHCPACK moves client back to BOUND state – Receipt of DHCPNACK moves client back to INITIALIZE state ? If no response is received by % of lease expiration time, the client resends the DHCPREQUEST and moves to REBIND state – Receipt of DHCPACK moves client back to BOUND state – Receipt of DHCPNACK or timeout moves client back to INITIALIZE state CS 640 14 DHCP Details ? Without relay agent, DHCP would not scale since it would require large number of servers (one per LAN) ? Addresses which are leased over a given period of time and must be updated – This means that DHCP requests might have to be made multiple times by the same system (RENEW requests) ? DHCP does not interact with DNS – Binding between IP assigned by DHCP and host name must be made independently ? Possible result 1: No host name given ? Possible result 2: Host is automatically assigned a preallocated domain name with its IP ? Possible results 3: Hosts are assigned permanent names – Requires additional mechanisms which do not yet exist
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