networking network_error ai_generated partial

NDP：对fe80::1在eth0上的邻居请求失败，无回复

NDP: Neighbor Solicitation for fe80::1 on eth0 failed, no reply

ID: networking/ipv6-ndp-failure

其他格式: JSON · Markdown 中文 · English
80%修复率
82%置信度
1证据数
2024-04-12首次发现

版本兼容性

版本状态引入弃用备注
Linux kernel 6.1 active — — —
Cisco IOS XE 17.9 active — — —
Windows Server 2022 active — — —

根因分析

IPv6邻居发现协议（NDP）发送了邻居请求以解析fe80::1的链路层地址，但未收到邻居公告，表明邻居不可达或未响应。

English

The IPv6 neighbor discovery protocol (NDP) sent a Neighbor Solicitation to resolve the link-layer address of fe80::1 but received no Neighbor Advertisement, indicating the neighbor is unreachable or not responding.

generic

官方文档

https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html

解决方案

  1. Verify IPv6 connectivity with ping: ping6 -c 3 fe80::1%eth0
  2. Flush the neighbor cache and retry: ip -6 neigh flush all && ip -6 neigh show

无效尝试

常见但无效的做法:

  1. 90% 失败

    Disabling IPv6 on the interface (sysctl net.ipv6.conf.eth0.disable_ipv6=1) avoids the issue but loses IPv6 connectivity entirely.

  2. 70% 失败

    Manually adding a static neighbor entry (ip -6 neigh add fe80::1 lladdr 00:11:22:33:44:55 dev eth0) may fail if the link-layer address is incorrect or the neighbor is genuinely unreachable.