FAQ entry for rpi openvpn performance issue

[stevef1uk]

I noticed that my client vpn link after installing the latest version of raspy was running very slowly c. 2mbs
This caused me issues as I use it for streaming media. The rpi running raspap is connected by ethernet to my router and I start openvpn via the rasap GUI with a client configuration to connect to a rpi running openvpn remotely.

I solved the problem via some very esoteric fixes after a lot of Googling. I just wanted to share my solution which resulted in me getting c 20mbs again. I am sharing in case anyone else has this issue.

First I noticed on the rpi I am running raspy I had lost DNS when sshing onto linux. In order to fix this and get the vpn connection speed back up to 20mbs from 2mbs I needed to make configuration files changes to 2 files:

see lukicdarkoo/rpi-wifi#23 & https://pimylifeup.com/raspberry-pi-dns-settings/

1. I edited /etc/default/dnsmasq & added to the end:
   DNSMASQ_EXCEPT=lo

2. I edited /etc/dhcpcd.conf & added:
   interface eth0
   static domain_name_servers=8.8.8.8 8.8.4.4

Also added static domain_name_servers=8.8.8.8 8.8.4.4 to wlan0 interface

As a slight additional optimisation I followed this guide & added to by openvpn config file /etc/openvpn/client.conf
mssfix 1420

I am not sure whether the raspap install updates the two primary config files listed above, but if it does perhaps they could be updated as above?