kk的blog

2025/11/06

有人反應捉不到ip

我第一反應是會不會dhcp ip 滿了

所以先查 log

grep -i free /var/log/messages

並沒有找到反應段有出現 no free leases

再來查捉不到ip 的pc mac

出現很多如下的 log

Nov 6 10:27:44 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:28:16 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:28:20 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:28:29 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:28:46 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:34:00 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:34:05 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:34:12 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:34:28 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:35:01 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:35:06 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:35:14 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

Nov 6 10:35:30 dhcp dhcpd[599]: DHCPDISCOVER from 9c:7b:ef:53:7f:e3 via 192.168.12.254

表示pc有送封包到 dhcp server 但 dhcp server 沒回應

正常的log應該是如下

Nov 6 13:27:40 dhcp dhcpd[619]: DHCPDISCOVER from 48:9e:bd:db:28:bd via 192.168.12.254

Nov 6 13:27:41 dhcp dhcpd[619]: DHCPOFFER on 192.168.12.221 to 48:9e:bd:db:28:bd (LAPTOP-RGQR6GL6) via 192.168.12.254

Nov 6 13:27:41 dhcp dhcpd[619]: DHCPREQUEST for 192.168.12.221 (10.0.0.3) from 48:9e:bd:db:28:bd (LAPTOP-RGQR6GL6) via 192.168.12.254

Nov 6 13:27:41 dhcp dhcpd[619]: DHCPACK on 192.168.12.221 to 48:9e:bd:db:28:bd (LAPTOP-RGQR6GL6) via 192.168.12.254

於是我把dhcp再加大範圍加了五個ip

就正常了

所以為什麼沒出現 no free leases 的訊息

這個再查看看