![/30 子网上的 dhcpd 始终抱怨租约不可用](https://linux22.com/image/702394/%2F30%20%E5%AD%90%E7%BD%91%E4%B8%8A%E7%9A%84%20dhcpd%20%E5%A7%8B%E7%BB%88%E6%8A%B1%E6%80%A8%E7%A7%9F%E7%BA%A6%E4%B8%8D%E5%8F%AF%E7%94%A8.png)
我在使用 dhcpd 时遇到了麻烦。
对于具有大量 255.255.255.252 子网的大型 WAN,我们使用 DHCP 将单个 IP 推送到所有这些站点。
每个子网的定义如下
subnet 10.91.17.0 netmask 255.255.255.252 {
option routers 10.91.17.1;
option subnet-mask 255.255.255.252;
pool {
allow members of "Devices";
range 10.91.17.2 10.91.17.2;
}
}
一切正常,但是系统日志中充满了下面的消息。另请参阅 tcpdump。
客户端在网站上永远不会改变,所以每次请求时它都应该获得相同的地址。
你知道为什么我一直收到这些消息吗?
谢谢
DHCPREQUEST for 10.91.17.2 from 00:18:6e:3a:0f:00 via 10.91.17.1: lease 10.91.17.2 unavailable.
DHCPNAK on 10.91.17.2 to 00:18:6e:3a:0f:00 via 10.91.17.1
15:46:10.347927 IP (tos 0x0, ttl 255, id 22511, offset 0, flags [none], proto UDP (17), length 281)
10.205.148.2.bootps > 10.205.148.5.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:18:6e:3a:0f:00, length 253, xid 0x1, Flags [none] (0x0000)
Client-IP 10.91.17.2
Gateway-IP 10.91.17.1
Client-Ethernet-Address 00:18:6e:3a:0f:00
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Request
Client-ID Option 61, length 7: ether 00:18:6e:3a:0f:00
15:46:10.348202 IP (tos 0x0, ttl 64, id 29802, offset 0, flags [DF], proto UDP (17), length 328)
10.205.148.5.bootps > 10.91.17.1.bootps: [bad udp cksum 0xbb73 -> 0xbe92!] BOOTP/DHCP, Reply, length 300, xid 0x1, Flags [Broadcast] (0x8000)
Gateway-IP 10.91.17.1
Client-Ethernet-Address 00:18:6e:3a:0f:00
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: NACK
Server-ID Option 54, length 4: 10.205.148.5
MSG Option 56, length 31: "requested address not available"