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I just set up a VPN connection to my workplace, but it fail s to connect. Our protocol for setting up VPN on Windows clients requires we specify DNS servers that are inside our corporate network. I cannot find the way to do this on Ubuntu f.or the VPN connection I have set up.

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I have not tried this but it may help you. From the Ubuntu Server Guide

sudo cp /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz /etc/openvpn/  
sudo gzip -d /etc/openvpn/server.conf.gz

Edit /etc/openvpn/server.conf changing the following options to:

dev tap0
up "/etc/openvpn/ br0"
down "/etc/openvpn/ br0"
push "route"
push "dhcp-option DNS"
push "dhcp-option DOMAIN"
tls-auth ta.key 0 # This file is secret


cd /etc/openvpn/easy-rsa/
source vars
./pkitool hostname

Replace hostname with the actual hostname of the machine connecting to the VPN. Copy the following files to the client:

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