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> arp -e 那个应该是通信过才会出现的。你也可以进行 ARP 扫描,但是前提是知道
对方的 IP,因为 ARP 就是问谁的 IP 是 xxx 啊。最后一个问题,像我之前dhcpd分配了IP但是dhcpcd没有接收的情况,要怎么侦测到这个问题呢?dhcp的服务器端和客户端之间都是单向工作,没有互相情况确认的机制的吗?(像TCP包一样的确认机制)
> 当然可以,我也有个 headless 设备,为了确保 dhcp 出问题时仍能连接,我写了个定时脚本给 eth0 设置一个固定的 IP 地址,只需要两个命令 ip link set up dev eth0, ip addr add 10.0.0.1/24 dev eth0但是你是怎么把脚本写进这个设备的呢。。在还没有通信,也没有直接操作这个设备的情况下?
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没有对应路由项是回 network unreachable 吧。no route to host 是最后一跳路由器 arp 找不到目标时回复的。
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Look up the broadcast address of the Ethernet connection (Laptop),
$/sbin/ifconfig eth1 | grep "Bcast" | awk -F: '{print $3}' | awk '{print $1}'
10.42.0.255
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