[vpn-help] Windows 7 64bit Slow VPN

[Roper, Andrew]

I would make sure that NIC drivers are up to date and all firmwares have been applied. I would also check for any IPS programs that may be running. It might also be a good idea to uninstall the client, reset the stack and reinstall the client. I would also make sure that there are no other IPSec clients installed on the machine. It might also be helpful to perform a packet capture on the egress interface to see if you are experiencing any excess fragmentation or other IP problems. 

-Andrew

-----Original Message-----
From: vpn-help-bounces at lists.shrew.net [mailto:vpn-help-bounces at lists.shrew.net] On Behalf Of Kevin VPN
Sent: Thursday, January 26, 2012 11:09 PM
To: vpn-help at lists.shrew.net
Subject: Re: [vpn-help] Windows 7 64bit Slow VPN

On 01/19/2012 09:42 AM, Mark A. DeMichele wrote:
> I meant to say, "I don't blame you", not "believe you".  Sorry.
>
> -----Original Message-----
> From: vpn-help-bounces at lists.shrew.net 
> [mailto:vpn-help-bounces at lists.shrew.net] On Behalf Of Mark A. 
> DeMichele
> Sent: Thursday, January 19, 2012 9:26 AM
> To: vpn-help at lists.shrew.net
> Subject: Re: [vpn-help] Windows 7 64bit Slow VPN
>
> I don't believe  you for being skeptical.  I'm a programmer and I 
> understand where you're coming from.
>
> I just did as you requested and was very methodical about it.  Here's 
> what I did.
>
> 1. Using the 2.2beta2 version, I uploaded using a VPN address and then 
> again with a public address outside the VPN.
> 	VPN Upload Speed: ~450KB/sec.
> 	Non-VPN Upload Speed: ~550KB/sec
>
> 2. I uninstalled 2.2beta version and installed 2.1.7.  I used the same 
> profile  (it's nice it remembers all that between uninstalls and 
> installs BTW). Same urls and same files to upload.
> 	VPN Upload Speed: ~12KB/sec.
> 	Non-VPN Upload Speed: ~550KB/sec.
>
> The higher rates vary a lot +/- 50KB/sec., but the slow VPN rate is 
> just pretty slow.
>
> I had tried 2.1.6 the other day with the same result.  I hadn't gone 
> back any further since the 2.2 fixed the problem.  Also both of my 
> Windows 7 64 bit machines seem to have this problem. Maybe it's router 
> related?
>
> I have a Belkin N600HD router.
>
>     Hardware	F7D8301 v1
>     Firmware	1.00.30 (Dec 24 2010)
>     Boot Loader	1.08e
>
> -----Original Message-----
> From: vpn-help-bounces at lists.shrew.net 
> [mailto:vpn-help-bounces at lists.shrew.net] On Behalf Of Kevin VPN
> Sent: Wednesday, January 18, 2012 8:37 PM
> To: vpn-help at lists.shrew.net
> Subject: Re: [vpn-help] Windows 7 64bit Slow VPN
>
> On 01/18/2012 11:45 AM, Mark A. DeMichele wrote:
>> I have an update on this.  For the heck of it, I installed version 
>> 2.2.0-beta2.  That seemed to fix it, or at least made it much better.
>>
>> I now get about 400KB/sec from both 64bit machines.
>>
>>
>> From: vpn-help-bounces at lists.shrew.net 
>> [mailto:vpn-help-bounces at lists.shrew.net] On Behalf Of Mark A.
>> DeMichele
>> Sent: Wednesday, January 18, 2012 10:13 AM
>> To: vpn-help at lists.shrew.net
>> Subject: [vpn-help] Windows 7 64bit Slow VPN
>>
>>
>>
>> I realized that my upload speeds to my office over our VPN were very 
>> slow so I started digging into it.  At the office we have a Netscreen
>> 10 hosting our VPN connections.  On one of the servers at the office 
>> we have a nice HTTP based file server that I can  access remotely 
>> using a public IP address (no vpn) and a local IP address (vpn), and 
>> when uploading it displays KB/Sec. This gives me the ability to 
>> compare upload speeds.
>>
>> Also, at my remote site (home - Comcast cable), I have several 
>> different machines behind the same router running different OS's.
>> These are the machines.
>>
>> Two  Windows 7 64 bit machines
>> One Windows 7 32 bit machine
>> One Windows Vista 32bit machine
>>
>> All the machines have Shrewsoft 2.1.7 installed using the same config.
>>
>> I tested all them without the VPN and they all uploaded at about 
>> 550-600KB/sec.
>>
>> On the Window Vista 32bit machine, I tried both Shrewsoft and my 
>> original Netscreen client.  They both performed ok at about 
>> 450-500KB/sec.  (Slower than without VPN, but I guess that's
> expected).
>>
>> Same results as above on the Windows 7 32 bit machine.
>>
>> However, on both the Windows 7 64bit machines, I'm only getting about 
>> 12KB/sec which is painfully slow.
>>
>> A co-worker at another remote location using Windows 7-64bit and 
>> Shrewsoft 2.1.6 can upload at about 550KB/sec.  I uninstalled my
>> 2.1.7 version and installed 2.1.6, but I get the same results, so I 
>> don't think it's 2.1.7.
>>
>> Can anyone give me some pointers on where to look to figure out why 
>> it's so slow.
>>
>
> Thanks for the update Mark.  I'm glad it's working faster now, but I'm 
> not sure why.  I don't recall anyone complaining about performance of 
> 2.1.x on Win7-64bit on the list before now.  Are you interested in 
> downgrading to 2.1.x on one of those machines to see if the 
> performance problem re-occurs?


Hi Mark,

I mentally corrected your typo, so no worries. :)  Thanks for doing the testing.  It definitely does seem like there's something there slowing things down.

Unless you're willing to test your machines behind a different router, I think we'll park this.  We haven't had anyone else complain about performance so far.  2.2.0 does have a number of changes in it to better support Win7 (the Virtual WiFi Miniport adapter conflict fix among them) and maybe there's some tweak there for throughput.  (I suppose you could read the changelogs for 2.2.0 if you're really keen.) _______________________________________________
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