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A comment on Watch Where the Linux Kernel Drops a Packet.

Re:Watch Where the Linux Kernel Drops a Packet by DominoTree on Wednesday May 20, 2020 @12:36PM (#23248891)
Link to the GitHub repo:

https://github.com/nhorman/dropwatch

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Re:Watch Where the Linux Kernel Drops a Packet by Ao7bei3s on Wednesday May 20, 2020 @01:10PM (#23249266)
Note there's also kernel side code for this. Theoretically it's generic, but practically it was written specifically for dropwatch and dropwatch is the only user of it that I am aware of.

https://github.com/torvalds/linux/blob/master/net/core/drop_...

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Re:Watch Where the Linux Kernel Drops a Packet by nh2 on Wednesday May 20, 2020 @04:21PM (#23251308)
If you just want to enable it in your kernel (in case your distribution hasn't already), the config option is called `CONFIG_NET_DROP_MONITOR`.

I've recently made it on-by-default in NixOS and also collected some info about which other distros already have it on-by-default and since when: https://github.com/NixOS/nixpkgs/pull/85119

dropwatch is very useful, I used it to debug interruptions of our VPN setup between servers.

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