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# Setup
`onion-grab` has been tested on Ubuntu/Debian based systems. If you are running
a large measurement, you may run into issues that are **OS related**.
## Hints
- We disabled and stopped `systemd-resolved`, which eventually causes some or
all DNS requests to be blocked when running with many concurrent workers.
- We used Google's `8.8.8.8` and `8.8.4.4`, which [supports 1500qps][] per IP.
- You may need to tinker with `ulimit` and `sysctl`, e.g., if observing that
there are too many open file descriptors or similar. See for example the
value of `ulimit -n` and `sysctl net.ipv4.ip_local_port_range`
[supports 1500qps]: https://developers.google.com/speed/public-dns/docs/isp
## Credit
Björn Töpel helped us debug some of these OS-related issues.
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