Hello OpenVPN community,

Aug 06, 2019  You may want to read: How to speed up Linux. Garry's mod key generator online. An OpenVPN static key will then be generated written to the file ta.key. This key afterwards should be copied to the server and all client machines over a pre-existing secure channel. It can be inserted in the same folder as the RSA.key and the.crt files. As your OpenVPN server is up. Speed up OpenVPN and get faster speed over its channel OpenVPN is a well-known VPN client for secure remote access or virtual private networking. If you use OpenVPN and experience a slow speed over its channel, you might be getting annoyed.

Sep 12, 2016 But when I do speed test on my local computer without VPN, I’ve got 25 mbits ( Expected ISP speed ) but when I do the test with VPN, it’s around 15-16 mbits with 60ms ping. I understand the ping but internet speed shouldn’t be that impacted. Oct 25, 2019  OpenVPN Client Key Generator. GitHub Gist: instantly share code, notes, and snippets.

I've been struggling with this for the past days and I have not made any progress so far. The configuration of OpenVPN was delightfully straight forward and pretty much everything worked out of the box. The only thing wrong with the installation are the transfer speeds. Without OpenVPN 'iperf' reports about 300 mbps download speed. As soon as OpenVPN is involved the speed drops to anywhere between 10 and 70 mbps depending on different mtu/crypto configurations.
I've been able to reproduce the issue in a simple adhoc VPN.

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Server (Debian 8):Client (Ubuntu 16.04):

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This gives me about 35 mbps on a link that should be 300 mbps. The situation is much worse when using tcp at 2-11 mbps. I've experimented with countless combinations of tun-mtu/fragment/mssfix/sndbuf/rcvbuf and many more, the maximum I've ever reached was about 60-70 mbps by adding the following parameters:CPU usage on the client is <50% and on the server it's <20%. I've tried different ports as well (443 for example) and iperf over an SSH tunnel gives me almost the full 300 mbps.
While researching this issue I've found people who have the same problem with no solution, people who had to change a tun-mtu or buf setting and the issue was gone, people who say that this is normal and people who say that the overhead should be max 10%. None of the setting changes I've found have helped.
If anyone has any idea as to what might be causing the slowdown and how we can get at least 100mbps out of the VPN that would be greatly appreciated!

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#!/bin/bash

#

# OpenVPN Client Key Generation Script

#

# Author: rtfpessoa

# Date: 03-09-2016

#

# Based on the guide:

# * https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04

#

# First argument: Client identifier

# Second argument: Generate key with password

client_key_name=$1

key_with_pass=$2

if [[ -z$client_key_name ]];then

echo'Missing client key name!'

exit 1

fi

VPN_DIR=~/openvpn-ca

KEY_DIR=${VPN_DIR}/keys

CLIENT_CFG_DIR=~/client-configs

OUTPUT_DIR=${CLIENT_CFG_DIR}/files

BASE_CONFIG=${CLIENT_CFG_DIR}/base.conf

mkdir -p $OUTPUT_DIR

chmod 700 ~/client-configs/files

# cp /usr/share/doc/openvpn/examples/sample-config-files/client.conf ~/client-configs/base.conf

cd${VPN_DIR}

source vars

if [[ -n$key_with_pass ]];then

./build-key-pass ${client_key_name}

else

./build-key ${client_key_name}

fi

cat ${BASE_CONFIG}

<(echo -e '<ca>')

${KEY_DIR}/ca.crt

<(echo -e '</ca>n<cert>')

${KEY_DIR}/${1}.crt

<(echo -e '</cert>n<key>')

${KEY_DIR}/${1}.key

<(echo -e '</key>n<tls-auth>')

${KEY_DIR}/ta.key

<(echo -e '</tls-auth>')

>${OUTPUT_DIR}/${1}.ovpn

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#!/bin/bash

#

# OpenVPN Client Key Revocation Script

#

# Author: rtfpessoa

# Date: 03-09-2016

#

# Based on the guide:

# * https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04

#

# First argument: Client identifier

client_key_name=$1

if [[ -z$client_key_name ]];then

echo'Missing client key name!'

exit 1

fi

cd~/openvpn-ca

source vars

./revoke-full ${client_key_name}

sudo cp -f ~/openvpn-ca/keys/crl.pem /etc/openvpn

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