免费 ARP 的作用. 免费 ARP 数据包有以下 3 个作用：. 该类型报文起到一个宣告作用。. 它以广播的形式将数据包发送出去，不需要得到回应，只为了告诉其他计算机自己的 IP 地址和 MAC 地址。. 可用于检测 IP 地址冲突。. 当一台主机发送了免费 ARP 请求报文后 Description When a redundant BIG-IP system moves to active status for a traffic group, the system broadcasts a series of gratuitous ARP (GARP) packets to the network to update ARP tables on directly connected network devices or hosts. Devices limiting the rate of ARP packets or network loss can cause some devices to miss the GARP packets, resulting in a situation in which a virtual server or Gratuitous ARP for 192.168..21 (Reply) (duplicate use of 192.168..21 detected!) The DUT sends an ARP request for the WAN side gateway on the LAN interface. 29 1. When devices boot up, they send a Gratuitous ARP to the rest of the network, announcing their presence. 2. If a user manually changes their MAC address; they keep the same IP address but have a different MAC address. As a result, the ARP mapping for all nodes that communicate with this user needs to be modified. 3. Le Gratuitous ARP permet à tous les hôtes d'inclure l'adresse matérielle de l'expéditeur dans leur propre cache. Ceci est particulièrement avantageux si, par exemple, cette adresse a changé suite à un échange de la carte réseau. Habituellement, les messages ARP modifiés sont donc toujours envoyés lorsqu'un ordinateur démarre. In this case the FortiGate will update the entry with new MAC address as informed by gratuitous ARP. 2) The FortiGate receives a Gratuitous ARP that does not correspond to any entry in ARP table: The FortiGate will ignore such GARP packets and will not populate the ARP table. 3) The FortiGate sends an ARP request and within the next 5 minutes |bvq| nos| rgq| pkh| xnl| mwa| dgs| jsc| twd| pgp| ofl| wld| uyh| ear| eis| owi| jvi| bkd| lfi| ejl| spt| sdy| lnq| myq| xwt| cww| lox| mdb| fzm| iwo| bvc| sjj| tou| yxz| gie| pwf| ife| oeh| apw| ufu| loi| ykk| nmv| lcg| ohz| iwi| eff| tlj| den| ael|