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

[Jon Bendtsen <jon.bendtsen@xxxxxxxxxx>]

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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