{
  "id": "networking/dhcp-server-exhausted-pool",
  "signature": "DHCP: No free leases in pool 192.168.1.0/24, server 10.0.0.1",
  "signature_zh": "DHCP：池192.168.1.0/24中无可用租约，服务器10.0.0.1",
  "regex": "No free leases|DHCP pool exhausted|no available addresses",
  "domain": "networking",
  "category": "resource_error",
  "subcategory": null,
  "root_cause": "The DHCP server has assigned all available IP addresses in the configured scope, and no leases have expired or been released to accommodate new clients.",
  "root_cause_type": "generic",
  "root_cause_zh": "DHCP服务器已分配了配置作用域中的所有可用IP地址，且没有租约过期或释放以容纳新客户端。",
  "versions": [
    {
      "version": "ISC DHCP 4.4",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Kea 2.4",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "dnsmasq 2.89",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Windows Server 2022 DHCP",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Restarting does not free existing leases; the pool remains exhausted.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Existing leases retain their original lease time until renewal; the change only affects future leases.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Expand the DHCP pool by adding more IP addresses to the scope: in dhcpd.conf, change 'range 192.168.1.100 192.168.1.200;' to 'range 192.168.1.100 192.168.1.250;' and restart the server",
      "success_rate": 0.95,
      "how": "Expand the DHCP pool by adding more IP addresses to the scope: in dhcpd.conf, change 'range 192.168.1.100 192.168.1.200;' to 'range 192.168.1.100 192.168.1.250;' and restart the server",
      "condition": "",
      "sources": []
    },
    {
      "action": "Manually release unused leases by clearing the DHCP lease file and restarting: rm /var/lib/dhcp/dhcpd.leases && systemctl restart isc-dhcp-server",
      "success_rate": 0.9,
      "how": "Manually release unused leases by clearing the DHCP lease file and restarting: rm /var/lib/dhcp/dhcpd.leases && systemctl restart isc-dhcp-server",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Expand the DHCP pool by adding more IP addresses to the scope: in dhcpd.conf, change 'range 192.168.1.100 192.168.1.200;' to 'range 192.168.1.100 192.168.1.250;' and restart the server",
    "Manually release unused leases by clearing the DHCP lease file and restarting: rm /var/lib/dhcp/dhcpd.leases && systemctl restart isc-dhcp-server"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.isc.org/dhcp/",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.9,
  "resolvable": "true",
  "first_seen": "2023-11-05",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}