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[Openvpn-users] Re: Moving from IPSEC to OpenVPN for VOIP


  • Subject: [Openvpn-users] Re: Moving from IPSEC to OpenVPN for VOIP
  • From: "PF" <paulf123@xxxxxxxxxxxx>
  • Date: Thu, 4 May 2006 01:14:49 -0500

Karl thanks for the basic reply. Further:

a) In my application (VOIP) some testing shows that tunneling via TCP would
be better:
http://www.networkworld.com/reviews/2006/022006-ssl-voip-test.html

b) I'm not sure other than by doing some testing myself (not sure even how!)
I can ascertain how much the difference in overhead between non tunneled,
tunneled with different levels of encryption and tunneled with no encryption
with OpenVPN and perhaps even vs. IPSEC.


Thanks for any further comments!




Greetings! Some research indicates that there may be benefits to running my
VOIP channels over OpenVPN instead of IPSEC. I have a few questions and
would be grateful for any responses:

a) Is it correct that I should try to use UDP mode?

b) What kind of bandwidth overhead would I be looking at vs. the big
overhead I am finding with IPSEC/GRE using 8K codecs?

c) If I am not concerned with security are there low/no encryption options
that will improve b)


THANKS!



"PF" <paulf123@xxxxxxxxxxxx> writes:
> a) Is it correct that I should try to use UDP mode?

It is preferred.  See the man page under the --proto option for a web
reference to inka.de for an article that discusses problems regarding
tunneling IP over TCP.

> c) If I am not concerned with security are there low/no encryption
> options that will improve b)

See the man page regarding --cipher for the "none" selection.


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