Slow speeds with Windows 7 client

tricky

Hi All,

I have a dedicated Ubuntu server with Openvpn running. its has 100mbits uploads download speed.

I have a openvpn setup as out lined in the Linode guide.

https://library.linode.com/networking/openvpn/ubuntu-12.04-precise

My internet connection speed used to connect to the vpn are: Down 35mbits, Up 6 mbits

When connecting in windows 7 my maxium download speed is 3 mbits, Up 6mbits(maxium).

With an Android client I'm getting downloads speed 25 mbits(limited by Wi-Fi), up 6 mbits.

Any ideas as why my download speeds are so slow in windows?? Is there a problem with my windows set up?

maxpl

i have the same exact issue and it began happening recently.
i use privatvpn, but the issue is the same when connecting through the openvpn gui.

max download speeds in windows 7 are 3 to 4Mbps with 1Mbps max download.
when it worked well, i was able to hit 25-30Mbps down when connecting to these servers.

i really dont know what to do at this point.
if someone can tell me how to post config files i could do so.

strfr

Hey folks, I am observing the very same behavior: linux/OS X clients can connect with the full WAN speed (250/25Mbps in this case) but Windows (7,XP) are limited to ~7-8Mbps (or ~800kBps). If there is more then one Windows clients connected, then each of them is limited to the mentioned speed.
The speed limit is the same for SMB/SCP/FTP etc. protocols over VPN tunnel. Connecting FTP/WinSCP directly I am getting full WAN speed. I have already tried every possible setting with tun-mtu, fragment, mssfix etc. - there are small speed differences but nothing dramatic..

Last few days I spend many hours searching forums etc., here are couple of links where people are trying to solve the same issue:
https://forums.openvpn.net/topic9850.html
https://forums.openvpn.net/topic10593.html
http://ubuntuforums.org/showthread.php?t=1484790
http://readlist.com/lists/lists.sourceforge.net/openvpn-users/0/4987.html
etc. https://www.google.cz/search?q=openvpn+client+windows+slow&oq=openvpn+client+windows+slow&aqs=chrome..69i57.8065j0j4&sourceid=chrome&espv=210&es_sm=122&ie=UTF-8&sei=8X_mUq7GCLSM7Aa7vICQBg&gbv=2#gbv=2&q=openvpn+%22windows+clients%22+slow&start=0

I have not tried to change the port on my server (CentOS 6.5) as mentioned here https://forum.linode.com/viewtopic.php?p=61206&sid=b95deb2778892736d156384a92663fea and at some other links, but I doubt it will make any difference.. I could try that anyway.. I am observing the same behavior in different locations/servers, most of them are CentOS VM in KVM visualized environment. All machines are of course powerful enough to feed the maximum bandwidth..

I haven't found SINGLE successful story about this issue, any one from here willing to participate to find what the hell is going on?

Thanks and cheers

Frantisek

d4rk0n3

Very interesting read as i'm plagued by this issue as well, i've been troubleshooting for a month without any luck solving this.

I have the exact same symptoms as op, download speed is horrible while upload is maximum of tunnels capacity, done every configuration to openvpn available, it's clearly not a mtu issue, there's something else.

If anyone with the expertise could give their input it would be great!

michal.sokolowski

Since a week I'm banging my head against the wall with sth similar, in three branches office we use high link LTE connection, speeds to openvpn server are surprisingly slow.

What I discover so far:
- all Windows 7 clients 64x (I've tested 5 so far in different locations) are affected when using this LTE connection (20/20 mbps),
- Windows 7 64 bit clients when using DSL connection are not affected (10/1 mbps),
- speeds via tunnels 2-4 mbps (SMB,HTTP/S)
- speeds directly to server full bandwidth (10 [mbps]),
- there is almost 50% improvement when using TCP,
- latency (idle link,tunnel) 50ms to server from client,
- windows 8 64bit are not affected (from LTE location) - can somebody confirm it that there is no problem when using W8?

I'm using lastest openvpn-install-2.3.6-I001-x86_64.exe on client and openvpn-2.3.4 on server. I could swear then after update to 2.3.4 it becomes worse.
Server kernel: Linux 2.6.37.6 #2 SMP Fri May 17 20:59:54 CDT 2013 x86_64 Intel(R) Xeon(R) CPU X3430 @ 2.40GHz

What did I tired to tune?
- mtu size, fragment, mssfix, disable compresion, disable encryption, changing txqueue lengths on server, change lport on server, w7 tcp auto-tuning options, update drivers, bioses etc.,

I am going to replace my firewall soon, so I'll update kernel to the latest debian stable (Wheezy)

Can u describe connection setup in branch office?

Geoker

Hey guys,
I've tested on windows 8 and windows 8.1 x64 with UDP connection. The average is ~ 20Mbs
On win7 x64, i get ~4mbs. The upload seems to work fine on win 7 .

KeyzerSuze

Same here.

I get 60-80Mb/s with out vpn via wireless
and peak 30-40Mb/s to start up ... down to 7-10Mb/s with openvpn client