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cmd/derper: clarify that derper and tailscaled need to be in sync

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Fixes #12617

Change-Id: Ifc87b7d9cf699635087afb57febd01fb9a6d11b7
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-06-26 19:22:00 -07:00
committed by Brad Fitzpatrick
parent 6b801a8e9e
commit 210264f942
2 changed files with 7 additions and 1 deletions
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cmd/derper/README.md
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@@ -30,7 +30,9 @@ If you've decided or been advised to run your own `derper`, then read on.
* You must build and update the `cmd/derper` binary yourself. There are no
packages. Use `go install tailscale.com/cmd/derper@latest` with the latest
version of Go. You should update this binary approximately as regularly as
you update Tailscale nodes.
you update Tailscale nodes. If using `--verify-clients`, the `derper` binary
and `tailscaled` binary on the machine must be built from the same git revision.
(It might work otherwise, but they're developed and only tested together.)
* The DERP protocol does a protocol switch inside TLS from HTTP to a custom
bidirectional binary protocol. It is thus incompatible with many HTTP proxies.