networking network_error ai_generated true

ICMP redirect received from 10.0.0.1 for destination 192.168.1.100

ID: networking/icmp-redirect-received

Also available as: JSON · Markdown · 中文
85%Fix Rate
82%Confidence
1Evidence
2023-11-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Linux kernel 6.1 active — — —
FreeBSD 13.2 active — — —
Cisco IOS 15.9 active — — —

Root Cause

A router sent an ICMP redirect message indicating a better route exists for a destination, often due to suboptimal routing configuration or asymmetric routing paths.

generic

中文

路由器发送了ICMP重定向消息，表明存在通往目的地的更优路由，通常是由于路由配置欠佳或非对称路由路径所致。

Official Documentation

https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt

Workarounds

  1. 90% success Accept the redirect and update routing table: route add -net 192.168.1.0/24 gw 10.0.0.2 dev eth0 
    Accept the redirect and update routing table: route add -net 192.168.1.0/24 gw 10.0.0.2 dev eth0
  2. 95% success Disable redirects only on the specific interface: sysctl -w net.ipv4.conf.eth0.accept_redirects=0 
    Disable redirects only on the specific interface: sysctl -w net.ipv4.conf.eth0.accept_redirects=0

中文步骤

  1. Accept the redirect and update routing table: route add -net 192.168.1.0/24 gw 10.0.0.2 dev eth0
  2. Disable redirects only on the specific interface: sysctl -w net.ipv4.conf.eth0.accept_redirects=0

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Disabling ICMP redirect processing globally (net.ipv4.conf.all.accept_redirects=0) may break legitimate routing updates and cause packet loss.

  2. 80% fail

    Ignoring the redirect without updating routing tables can lead to persistent suboptimal paths and increased latency.