BirdNest Tech Talk

Sep 26, 2024 · Operations

How to Trace Linux Packet Drops with eBPF and kfree_skb_reason

This article explains why packets are dropped in Linux, introduces the kfree_skb_reason API added in kernel 5.17, and shows step‑by‑step how to use bpftrace to capture drop reasons, five‑tuple details, and stack traces for precise network debugging.