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readme: notice for sys admins

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README.md
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@@ -444,7 +444,17 @@ Options:
</details> </details>
## What changes are done to Linux system ## System admins should know
### Take care of concurrency
Linux-router script is home-made, not enterprise-level.
- You can run multiple linux-router instances and they work simultaneous, as long as you start/stop **one by one**, not all at once. We **can't ensure** its locks covering 100% race condition edge cases.
- Use it after the system has fully booted. When you’re manually (re)starting/stopping some network-related services, stop linux-router first, otherwise those services (flushing iptables or some) may break linux-router's setup.
### What changes are done to Linux system
On exit of a linux-router instance, script **will do cleanup**, i.e. undo most changes to system. Though, **some** changes (if needed) will **not** be undone, which are: On exit of a linux-router instance, script **will do cleanup**, i.e. undo most changes to system. Though, **some** changes (if needed) will **not** be undone, which are: