networking network_error ai_generated partial

DHCPREQUEST timed out on interface eth0, waiting for DHCPOFFER

ID: networking/dhcp-request-timeout

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
1Evidence
2024-01-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
isc-dhcp-client 4.4.3 active — — —
dhcpcd 9.4.1 active — — —
NetworkManager 1.42 active — — —

Root Cause

The DHCP client sent a DHCPREQUEST but did not receive a DHCPACK from the server within the timeout period, often due to server unavailability, network congestion, or VLAN misconfiguration.

generic

中文

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。

Official Documentation

https://www.isc.org/dhcp/

Workarounds

  1. 90% success Check DHCP server connectivity: tcpdump -i eth0 port 67 or port 68 -vvv 
    Check DHCP server connectivity: tcpdump -i eth0 port 67 or port 68 -vvv
  2. 95% success Assign a static IP as a temporary fix: ifconfig eth0 192.168.1.10 netmask 255.255.255.0 up 
    Assign a static IP as a temporary fix: ifconfig eth0 192.168.1.10 netmask 255.255.255.0 up

中文步骤

  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

Dead Ends

Common approaches that don't work:

  1. 80% fail

    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.

  2. 70% fail

    Restarting the network service repeatedly without checking the DHCP server logs can cause unnecessary downtime.