Re: [Openvpn-users] Openvpn slow on asymmetric connections

[George Thompson <georgegpn@xxxxxxxxxxxxx>]

Hi there,
    I tried both TCP and UDP.  Other then the slight latency increase with TCP, it didn't make a diffrance in speed.  I went over to Englewood and used the comcast connection I have over there.  Its speed is 5mbit/1mbit.  The download speed I got there was a little under a megabit.

Thanks

-----Original Message-----
>From: Jon Bendtsen <jon.bendtsen@xxxxxxxxxx>
>Sent: Jan 4, 2006 3:15 AM
>To: OpenVPN Users <openvpn-users@xxxxxxxxxxxxxxxxxxxxx>
>Subject: Re: [Openvpn-users] Openvpn slow on asymmetric connections
>
>Den onsdag 4.jan kl. 1:46 skrev George Thompson:
>
>>
>> AES256 is an encryption algorithm I like to use.  I use it for my  
>> disk encryption with PGP.  Ive read about it and its very strong.   
>> Even thou blowfish is strong as well, I don't completely trust it,  
>> and 3des is out of the question;  that algorithm is just way to  
>> slow.  On a LAN connection I get about 96 mbits/s with AES256, with  
>> lots of cpu time to spare.  I checked my traffic.  Between the  
>> server and client (out of the tunnel),  my latency is average is 26  
>> ms.  In the tunnel my latency average is 32ms.  There is no packet  
>> loss in or out of the tunnel.  I tried playing with the buffers by  
>> increasing them, but it did not improve anything.  By the way, I  
>> did disable the encryption and lzo-comp to try and diagnose the  
>> problem.  Even with those disabled the speed is still the same. The  
>> download for this thing really does seem limited by the upload.   
>> Verizon temporarily increased my upload to 5mbits/s so I can see if  
>> that was it.  When they did this my download on Openvpn  went up to  
>> about 4.6mbit/s.  This is kind of strange there is nothing much  
>> using my upstream but Openvpn seems to sync the connection to the  
>> slowest of the two.  I even ran tcpdump to confirm that nothing but  
>> tunnel data was using my upstream. When I do download my average  
>> upstream usage is about 92kbit/s.  Not even close to the 2mbits I  
>> have.  The only thing that is uploading is the ack packets (in  
>> tunnel).  The compression is adaptive, so if I am sending anything  
>> that cannot be compressed it should cut off.  I have it because it  
>> helps when I am web browsing.  It compression is disabled for now.
>
>Okay. Next i want you to try using TCP rather than UDP.
>Also try using a different internet provider, preferable
>similar to yours in speed.
>
>
>
>JonB
>
>
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