# 接口eth0上的DHCPREQUEST超时，正在等待DHCPOFFER

- **ID:** `networking/dhcp-request-timeout`
- **领域:** networking
- **类别:** network_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

DHCP客户端发送了DHCPREQUEST，但在超时时间内未收到服务器的DHCPACK，通常是由于服务器不可用、网络拥塞或VLAN配置错误所致。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| isc-dhcp-client 4.4.3 | active | — | — |
| dhcpcd 9.4.1 | active | — | — |
| NetworkManager 1.42 | active | — | — |

## 解决方案

1. ```
   Check DHCP server connectivity: tcpdump -i eth0 port 67 or port 68 -vvv
   ```
2. ```
   Assign a static IP as a temporary fix: ifconfig eth0 192.168.1.10 netmask 255.255.255.0 up
   ```

## 无效尝试

- **** — Increasing the DHCP timeout on the client only masks the problem if the server is unreachable due to firewall rules blocking UDP port 67/68. (80% 失败率)
- **** — Restarting the network service repeatedly without checking the DHCP server logs can cause unnecessary downtime. (70% 失败率)