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אני מצאתי את זה די משעשע... ציטוט מתוך Implementing, Managing, and Maintaining a Microsoft Windows Server 2003 Network Infrastructure של MS Press:
אני מצאתי את זה די משעשע... ציטוט מתוך Implementing, Managing, and Maintaining a Microsoft Windows Server 2003 Network Infrastructure של MS Press:
Off the Record In the MCSE exam world, the arp –d command supposedly saves your day whenever you cannot connect to a computer, located in broadcast range, whose network card has just been changed. Here’s what you’re supposed to see: the new adapter has furnished the seemingly-stranded computer with a fresh hardware address, thus rendering obsolete your currently stored IP-to-MAC address mapping for that remote host. Until you clear your local ARP cache, your computer will keep trying to reach the remote one by calling out a defunct hardware address. So goes the theory. In reality, virtually all ARP entries are dynamic, which means they are automatically added and aged out of the cache as needed. Dynamic ARP entries have a life span of only 2 minutes if they are not renewed. So, if your computer happens to cache the IP-to-MAC address mapping of another host, immediately after which someone shuts down that remote box, opens it up, replaces its network card, and miraculously gets it back online before all of 120 seconds have elapsed, and if, despite this feat, you are still too impatient to wait out the intervening moments before you can ping same address, then the arp –d command really may save your day. Otherwise, you needn’t worry about it.
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