Performance With A Simple Openvpn Setup

Sep 29, 2009

How do go about discovering where your bottleneck is with an openvpn setup?

Ive setup openvpn on my remote server and have setup everything so that my desktop clients (vista and ubuntu) at home can connect and have all internet traffic directed successfully through the tunnel.

Im using it to stream video that would normally be inaccessible outside of the UK whilst im in Japan i.e. iplayer.

The problem is its oftenvery choppy and unplayable. Though its good when england is sleeping.

Im new to servers (not to stuff like programming though) so dont know where the problem lies, how to find it out or even where to start looking. For example things ging through my head

Is it the limitations of the vps? How do i find that out? my plan:- vps1

Is it the location of the actual server in the uk? How do i know if there are any better coming from japan?

Is it my configurations? How do i pinpoint that?

Or is it working as good as it can be? How do i know that for sure?
etc etc

What would be your process of elimantion? Quick checks that would tell you which direction to move forward in?

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OpenVPN- My Setup/config?

Nov 20, 2007

In the /var/log/messages snippet posted below, I see this (see below snippet)

Is this bad? Are the highlighted parts bad? Do they show an incorrect or inefficient configuration? I tried to find out what it means, but google isn't being too helpful in this instance.

(The VPN is used only as an "internet gateway" for about 5 users who need to browse the internet from within a foreign country.)

Here is the logfile snippet from /var/log/messages. (I changed he vpn username and client IP for privacy.)

Quote:

Nov 20 09:28:07 vpn openvpn[13712]: MULTI: multi_create_instance called
Nov 20 09:28:07 vpn openvpn[13712]: Re-using SSL/TLS context
Nov 20 09:28:07 vpn openvpn[13712]: LZO compression initialized
Nov 20 09:28:07 vpn openvpn[13712]: Control Channel MTU parms [ L:1560 D:140 EF:40 EB:0 ET:0 EL:0 ]
Nov 20 09:28:07 vpn openvpn[13712]: Data Channel MTU parms [ L:1560 D:1450 EF:60 EB:135 ET:0 EL:0 AF:3/1 ]
Nov 20 09:28:07 vpn openvpn[13712]: Local Options hash (VER=V4): 'b695cb4a'
Nov 20 09:28:07 vpn openvpn[13712]: Expected Remote Options hash (VER=V4): 'bc07730e'
Nov 20 09:28:07 vpn openvpn[13712]: TCP connection established with 91.186.11.226:52093
Nov 20 09:28:07 vpn openvpn[13712]: TCPv4_SERVER link local: [undef]
Nov 20 09:28:07 vpn openvpn[13712]: TCPv4_SERVER link remote: 91.186.11.226:52093
Nov 20 09:28:07 vpn openvpn[13712]: user1/1.1.1.1:3861 MULTI: packet dropped due to output saturation (multi_process_incoming_tun)
Nov 20 09:28:18 vpn last message repeated 31 times
Nov 20 09:28:21 vpn openvpn[13712]: 91.186.11.226:52093 Connection reset, restarting [-1]
Nov 20 09:28:21 vpn openvpn[13712]: 91.186.11.226:52093 SIGUSR1[soft,connection-reset] received, client-instance restarting
Nov 20 09:28:21 vpn openvpn[13712]: TCP/UDP: Closing socket
Nov 20 09:28:26 vpn openvpn[13712]: user1/1.1.1.1:3861 MULTI: packet dropped due to output saturation (multi_process_incoming_tun)
Nov 20 09:28:57 vpn last message repeated 38 times
Nov 20 09:29:03 vpn last message repeated 9 times
Nov 20 09:29:07 vpn openvpn[13712]: MULTI: multi_create_instance called
Nov 20 09:29:07 vpn openvpn[13712]: Re-using SSL/TLS context
Nov 20 09:29:07 vpn openvpn[13712]: LZO compression initialized
Nov 20 09:29:07 vpn openvpn[13712]: Control Channel MTU parms [ L:1560 D:140 EF:40 EB:0 ET:0 EL:0 ]
Nov 20 09:29:07 vpn openvpn[13712]: Data Channel MTU parms [ L:1560 D:1450 EF:60 EB:135 ET:0 EL:0 AF:3/1 ]
Nov 20 09:29:07 vpn openvpn[13712]: Local Options hash (VER=V4): 'b695cb4a'
Nov 20 09:29:07 vpn openvpn[13712]: Expected Remote Options hash (VER=V4): 'bc07730e'
Nov 20 09:29:07 vpn openvpn[13712]: TCP connection established with 91.186.11.226:52687
Nov 20 09:29:07 vpn openvpn[13712]: TCPv4_SERVER link local: [undef]
Nov 20 09:29:07 vpn openvpn[13712]: TCPv4_SERVER link remote: 91.186.11.226:52687
Nov 20 09:29:08 vpn openvpn[13712]: user1/1.1.1.1:3861 MULTI: packet dropped due to output saturation (multi_process_incoming_tun)
Nov 20 09:29:21 vpn last message repeated 16 times
Nov 20 09:29:21 vpn openvpn[13712]: 91.186.11.226:52687 Connection reset, restarting [-1]
Nov 20 09:29:21 vpn openvpn[13712]: 91.186.11.226:52687 SIGUSR1[soft,connection-reset] received, client-instance restarting
Nov 20 09:29:21 vpn openvpn[13712]: TCP/UDP: Closing socket
Nov 20 09:29:21 vpn openvpn[13712]: user1/1.1.1.1:3861 MULTI: packet dropped due to output saturation (multi_process_incoming_tun)
Nov 20 09:29:34 vpn last message repeated 144 times
Nov 20 09:30:06 vpn openvpn[13712]: MULTI: multi_create_instance called
Nov 20 09:30:06 vpn openvpn[13712]: Re-using SSL/TLS context
Nov 20 09:30:06 vpn openvpn[13712]: LZO compression initialized
Nov 20 09:30:06 vpn openvpn[13712]: Control Channel MTU parms [ L:1560 D:140 EF:40 EB:0 ET:0 EL:0 ]
Nov 20 09:30:06 vpn openvpn[13712]: Data Channel MTU parms [ L:1560 D:1450 EF:60 EB:135 ET:0 EL:0 AF:3/1 ]
Nov 20 09:30:06 vpn openvpn[13712]: Local Options hash (VER=V4): 'b695cb4a'
Nov 20 09:30:06 vpn openvpn[13712]: Expected Remote Options hash (VER=V4): 'bc07730e'
Nov 20 09:30:06 vpn openvpn[13712]: TCP connection established with 91.186.11.226:53285
Nov 20 09:30:06 vpn openvpn[13712]: TCPv4_SERVER link local: [undef]
Nov 20 09:30:06 vpn openvpn[13712]: TCPv4_SERVER link remote: 91.186.11.226:53285
Nov 20 09:30:21 vpn openvpn[13712]: 91.186.11.226:53285 Connection reset, restarting [-1]
Nov 20 09:30:21 vpn openvpn[13712]: 91.186.11.226:53285 SIGUSR1[soft,connection-reset] received, client-instance restarting
Nov 20 09:30:21 vpn openvpn[13712]: TCP/UDP: Closing socket

It goes on like this, with this pattern repeating every 20 seconds or so. Is this normal?

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HOWTO OpenVPN Setup Guide For FC3, FC4, FC5, CentOS And Others,connecting Via Windows

Apr 1, 2007

I have had great difficulty in setting up OpenVPN, so I thought, when I finally do get it to work, I will write a HOWTO, so other can hopefully benefit…

This guide was done using a FC4 VPS, running on Xen, it will work on OpenVZ, all you need to do is ask your VPS provider to install “tun support”.

1.First of all get a few additional repos, If you already have your repos setup, skip this step

If you have Fedora 3, follow these steps,

[url]

If you have Fedora 4, follow these steps,

[url]

If you have Fedora 5, follow these steps,

[url]

If you have CentOS, follow the “additional third party CentOS repos”

[url]

Then issue these commands, each line is a new command, anything beginning with "#" are comments so dont try to execute those.

Code:
yum update

yum install openssl openssl-devel
# openssl and openssl-devel may be installed already… so don’t worry

2. Right, now you want to install OpenVPN, here are the commands,

Code:
yum install openvpn -y

#Now check that it works

service openvpn start
service openvpn stop

3. A few things to setup before you can make certificates, issue these commands,

Code:

find / -name "easy-rsa"

#you should get an output like this…

/usr/share/doc/openvpn-2.0.7/easy-rsa

#Now, make a copy of the easy-rsa directory, to /etc/openvpn/ ( make sure you #have put the right version number in i.e. mine was -2.0.7, change if needed)

cp -R /usr/share/doc/openvpn-2.0.7/easy-rsa /etc/openvpn/

cd /etc/openvpn/easy-rsa

chmod 777 *

mkdir /etc/openvpn/keys

4. You need to edit the vars file, located in /etc/openvpn/easy-rsa
You can use any editor you like, I used vi.

Change the line

Code:
export KEY_DIR=$D/keys
to

Code:
export KEY_DIR=/etc/openvpn/keys
Also at the bottom of this file you will see something similar to this,

Code:
export KEY_COUNTRY=US
export KEY_PROVINCE=CA
export KEY_CITY=SOMEWHERE
export KEY_ORG="My Org"
export KEY_EMAIL=me@mydomain.com
Change this to your own values.

5. Now its time to make the certificates, enter these commands

Code:
. ./vars

Code:
./clean-all

Code:
./build-ca
# just hit enter to the defaults apart from Common Name, this must be unique
# call it something like mydomain-ca

Code:
./build-key-server server

Code:
./build-key client1
# remember that common name must be unique e.g. use mydomain-client1
# and YES you want to sign the keys

Code:
./build-key client2
# do this step for as many clients as you need.

Code:
./build-dh

6. We are almost done now… right we need to create a few config files, you can download my template from here,

Code:
cd /etc/openvpn

Code:
wget www.designpc.co.uk/downloads/server.conf
# make sure you change a few things in the server.conf file, like DNS
# servers

Code:
touch server-tcp.log
~ this makes the log file..

Code:
touch ipp.txt
this makes the IP reservation list.

7. You need to make a few changes to OpenVPN itself. Go to..

Code:
cd /etc/init.d/
edit the openvpn file

#Uncomment this line (line 119)

Code:
echo 1 > /proc/sys/net/ipv4/ip_forward
Add these lines below it, changing 123.123.123.123 to your public IP address,

Code:
iptables -t nat -A POSTROUTING -s 192.168.2.3 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.4 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.5 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.6 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.7 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.8 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.9 -j SNAT --to 123.123.123.123
iptables -t nat -A POSTROUTING -s 192.168.2.10 -j SNAT --to 123.123.123.123
Now install iptables if you don’t have it already,

Code:
yum install iptables

#test it

service iptables start
service iptables stop

8. Now for the client config files. If your client is a Windows machine, make sure you have installed OpenVPN, use the gui version, downloadable from here;

[url]

You need to copy a few files from the server to your client machine, here is the list, located in /etc/openvpn/keys/

## WARNING ## Use a secure way of transferring these files off the server, something like WinSCP.

ca.crt
client1.csr
client1.key
client1.crt

Put these files in this directory C:Program FilesOpenVPNconfig

Now you need to make a client config, here is an example..

PHP Code:

clientdev tunproto tcp#Change my.publicdomain.com to your public domain or IP addressremote my.publicdomain.com 1194resolv-retry infinitenobindpersist-keypersist-tunca ca.crtcert client1.crtkey client1.keyns-cert-type server#DNS Options here, CHANGE THESE !!push "dhcp-option DNS 123.123.123.123"push "dhcp-option DNS 123.123.123.124"comp-lzoverb 3 

Make sure you edit any of the lines with comments above them.

Call this file client1.opvn and put it in C:Program FilesOpenVPNconfig

Make sure the file extension is .opvn not .txt

To connect right click on OpenVPN in the taskbar >> Connect

To test ping 192.168.2.1

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I need some advice on my situaton at my host, and possibly some frame of reference as to what can/should be expected from a VPS setup like mine and what I can expect it to manage.

I have a site that sees some traffic of about 150k pageviews per day. On any given day, it peaks for roughly a timespan of 4 hours per day where there may be about 5 req/s.

I use a standard setup (LAMP) running mod_php in Apache, not fast cgi. I have a VPS on Virtuozzos Power Panel that has 1,5 GB RAM and really an unkonwn amount of CPU. I haven't been able to ascertain that information but probably could if I asked my host.

The problem is that during these hours it gets a bit slow from time to time. Running TOP shows sometimes a staggering amount of waiting processes i.e. the load is quite high (15 - 25).

So, I'm now really at a fork in the road where I either start looking into going with a different setup, say Nginx + PHP-FPM (FCGI) and try to see if that makes a difference. I'm not really an admin so I would be kind of lost on that. I could also start looking into my code to see if I can cache more or do smarter stuff etc.

However, before doing any of the above, I'd like to ask this crowd here if you think that I've sort of hit the roof on what can be expected from a VPS of the size I just told you about. That my situation is quite normal and that the real solution is actually just to upgrade my VPS. Is it?

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I am working on a busy and popular website which has a large amount of database activity - and requires hourly backups of all database data.

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Both servers are running a RAID HDD system which allows quick swaps of faulty HDDs without data loss.
An hourly full backup of database tables is running which is killing the server when it runs.

ISP has suggested installing a third server to run as a slave to the existing DB server, and hence always hold a duplicated of the live database.

I have a feeling however that this is basically just like having RAID mirroring, but on a different machine - so to solve the problem of a potential dodgy SQL statement wiping out ALL copies of the live database, we'd STILL need hourly backups to run, and hence would still see the major system speed drop each hour at the time of backup.

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I found 2 vps companies are highly recommanded on this forum, JaguarPC and LiquidWeb.

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I have installed OpenVPN on my VPS and I don't know how can i login on that and create client and configuration.

Support from Datacenter have installed on my VPS.
this is my details:

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Developed by James Yonan
Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net> ,

How can i login on OpenVPN? i'm very beginner.
Can you Please tell me , how can i access to OpenVPN and Create Account?
I have Cpanel/WHM on my VPS.

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Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
Nothing to do

i want install openvpn by yum

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Currently trying to get OpenVPN to work on my CentOS VPS, however not getting very far with it. I have followed the guide here: [url]

No problems with the guide, everything worked well! However when i goto start the openVPN service it fails with the following output in the log:

Sep 4 18:01:07 alpha openvpn[3137]: OpenVPN 2.0.9 i386-redhat-linux [SSL] [LZO] [EPOLL] built on Sep 4 2008
Sep 4 18:01:07 alpha openvpn[3137]: Diffie-Hellman initialized with 1024 bit key
Sep 4 18:01:07 alpha openvpn[3137]: TLS-Auth MTU parms [ L:1574 D:138 EF:38 EB:0 ET:0 EL:0 ]
Sep 4 18:01:07 alpha openvpn[3137]: Note: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)
Sep 4 18:01:07 alpha openvpn[3137]: Note: Attempting fallback to kernel 2.2 TUN/TAP interface
Sep 4 18:01:07 alpha openvpn[3137]: Cannot allocate TUN/TAP dev dynamically
Sep 4 18:01:07 alpha openvpn[3137]: Exiting

I then heard that i need to check the tun adapter, so ran the command "openvpn --dev tun0" which gave this output:

Thu Sep 4 18:24:57 2008 OpenVPN 2.0.9 i386-redhat-linux [SSL] [LZO] [EPOLL] built on Sep 4 2008
Thu Sep 4 18:24:57 2008 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port.
Thu Sep 4 18:24:57 2008 ******* WARNING *******: all encryption and authentication features disabled -- all data will be tunnelled as cleartext
Thu Sep 4 18:24:57 2008 Note: Cannot open TUN/TAP dev /dev/net/tun: Permission denied (errno=13)
Thu Sep 4 18:24:57 2008 Note: Attempting fallback to kernel 2.2 TUN/TAP interface
Thu Sep 4 18:24:57 2008 Cannot open TUN/TAP dev /dev/tun0: No such file or directory (errno=2)
Thu Sep 4 18:24:57 2008 Exiting

===============================================================

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Jul 14, 2008

how come I can't route all traffic through openvpn.

1. I was able to ping my client and server ip no problem. So the tunnel connection is fine.

The problem is i can't route internet traffic through openvpn.

I was able to ping from tun0 interface after i add below command
iptables -t nat -A PREROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

root@host188 [/etc/openvpn/config]# ping -I tun0 4.2.2.2
PING 4.2.2.2 (4.2.2.2) from 10.8.0.1 tun0: 56(84) bytes of data.
64 bytes from 4.2.2.2: icmp_seq=1 ttl=55 time=8.94 ms
64 bytes from 4.2.2.2: icmp_seq=2 ttl=55 time=8.65 ms
64 bytes from 4.2.2.2: icmp_seq=3 ttl=55 time=8.90 ms

However, my client can't ping 4.2.2.2 from vpn tunnel and I use tcpdump I saw the traffic coming.

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[url]

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Nov 15 06:45:18 gizmo openvpn[23616]: Cannot allocate TUN/TAP dev

ls -l /dev/net/tun
crwxrwxrwx 1 root root 10, 200 Jul 4 21:55 /dev/net/tun

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Does anyone have any suggestions or advice as to why this could be occuring?

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Jun 12, 2007

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