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Update TROUBLESHOOTING.md (#393)

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* Update TROUBLESHOOTING.md

Added example for problems with MTU size on Linux(Ubuntu)

* Update troubleshooting.md

* fix Advanced Usage broken link (#399)

* Update TROUBLESHOOTING.md

Added example for problems with MTU size on Linux(Ubuntu)
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mathew19 2017-04-13 22:15:04 -04:00 • committed by Dan Guido
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@ -99,6 +99,17 @@ Little Snitch is not compatible with IPSEC VPNs due to a known bug in macOS and
This issue appears intermittently due to issues with MTU size. If you experience this issue, we recommend [filing an issue](https://github.com/trailofbits/algo/issues/new) for assistance. Advanced users can troubleshoot the correct MTU size by retrying `ping` with the "don't fragment" bit size and decreasing packet size. This will determine the correct MTU size for your network, which you then need to update on your network adapter.
e.g. In Linux (client -- Ubuntu 16.04), determine your MTU size (after you're connected via ipsec)
```
$ ping -M do -s 1500 www.google.com
PING www.google.com (74.125.22.147) 1500(1528) bytes of data.
ping: local error: Message too long, mtu=1438
```
Set your MTU size on the network adapter (wlan0 or eth0)
```
$ sudo ifconfig wlan0 mtu 1438
```
### 8. The region you want is not available
You want to install Algo to a specific region in a cloud provider, but that region is not available in the list given by the installer. In that case, you should [file an issue](https://github.com/trailofbits/algo/issues/new). Cloud providers add new regions on a regular basis and we don't always keep up. File an issue and give us information about what region is missing and we'll add it.