I'm a Dev Who Barely Knows the Kernel. Here's How I'm Learning How to Track a Packet with pwru

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Hey, so here's a confession.

My idea of "networking debugging" used to top out at iptables -L -v -n, squinting at counters, and occasionally yelling "WHY IS IT DROPPING" at a terminal that does not care about my feelings.

I know just enough kernel to be dangerous: I know packets go in, sometimes they don't come out, and somewhere in between there's a black box that I was told is "the kernel networking stack."

Then I found cilium/pwru sitting in a repo I was poking around, and it broke my brain a little.