[Openvpn-users] Openvpn slow on asymmetric connections

[George Thompson <georgegpn@xxxxxxxxxxxxx>]

Hi there, 

The problem I am having with Openvpn is that it is 
slow on connections such as ADSL. It seems to be 
limited by the upstream even thou I download more than 
upload on it. It is set up using tap briding. I use 
Openvpn in many locations. The server is located in 
New York. It is on a 100 mbit/s connection. I tested 
the connection, it really is 100 mbit/s symmetrical. 
One of the locations I use the Openvpn client is at my 
university. The university has a DS3, the speed 
though the Openvpn tunnel there is about 10mbit/s 
symmetrical. Back at home I just recently switched 
over to Verizon's FIOS. Before I had Covad ADSL at 
1.5mbps/384kbps. The fastest I could download over 
the Openvpn tunnel on this connection was close to 300 
kbits/s. Which almost matches my upload speed of that 
DSL. It could never use up the 1.5mbits/s the DSL had 
avaliable. Now with FIOS I have 15mbits/2mbits. The 
maximum thoughput I can get with Openvpn on this 
connection is around 1.6 mbit/s, which closly matches 
the upload of the FIOS. Is there anything I can do to 
get Openvpn to use the downsteam bandwidth I have? I 
could really use it, if it's possible. I tried 
playing with the MTU msfix and fragment setting with 
no luck. Even tried disable the encryption and lzo- 
comp. That didn't do the trick either. If you guys 
have any ideas please let me know. 

Thanks, 

MarleyGPN 


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