networking network_error ai_generated true

eth0：巨帧被丢弃，MTU为1500但收到来自00:1a:2b:3c:4d:5e的帧大小为9000

eth0: jumbo frame dropped, MTU 1500 but frame size 9000 received from 00:1a:2b:3c:4d:5e

ID: networking/ethernet-jumbo-frame-dropped

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88%修复率
83%置信度
1证据数
2024-01-30首次发现

版本兼容性

版本状态引入弃用备注
Linux kernel 5.15 active — — —
Linux kernel 6.6 active — — —
FreeBSD 13.2 active — — —

根因分析

配置为标准1500字节MTU的网络接口接收到了大于MTU的以太网帧（巨帧），通常来自启用了巨帧的对端，导致内核因大小不匹配而丢弃该帧。

English

A network interface configured with a standard 1500-byte MTU received an Ethernet frame larger than the MTU (a jumbo frame), typically from a peer that has jumbo frames enabled, causing the kernel to drop the frame due to size mismatch.

generic

官方文档

https://www.kernel.org/doc/Documentation/networking/jumbo-frames.txt

解决方案

  1. On the sender: ifconfig eth0 mtu 1500
  2. ip link set dev eth0 mtu 9000

无效尝试

常见但无效的做法:

  1. Setting the MTU on eth0 to 9000 to accept jumbo frames. 60% 失败

    This may cause fragmentation issues if the path has other devices with lower MTU; also, it changes the interface's behavior for all traffic, not just the problematic peer.

  2. Using an access control list to block large frames from the sender. 80% 失败

    Does not solve the root cause; the sender still sends jumbo frames, and blocking them drops legitimate traffic.