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Update troubleshooting.md

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Dan Guido 2017-04-13 22:16:50 -04:00 • committed by GitHub
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@ -97,15 +97,15 @@ Little Snitch is not compatible with IPSEC VPNs due to a known bug in macOS and
### 7. Various websites appear to be offline through the VPN
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.
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 set, then decreasing packet size until it works. 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)
E.g., On Linux (client -- Ubuntu 16.04), use the following commands to determine your MTU size after you're connected via the IPsec tunnel:
```
$ 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)
Then, set the MTU size on your network adapter (wlan0 or eth0):
```
$ sudo ifconfig wlan0 mtu 1438
```