tinc and voip

[Perry Couprie]

De voip packages are 172 bytes.

23:12:52.378101 IP 192.168.2.2.12500 > 192.168.17.248.foliocorp: UDP, 
length 172
23:12:52.383119 IP 192.168.17.248.foliocorp > 192.168.2.2.12500: UDP, 
length 172
23:12:52.398525 IP 192.168.2.2.12500 > 192.168.17.248.foliocorp: UDP, 
length 172
23:12:52.411382 IP 192.168.17.248.foliocorp > 192.168.2.2.12500: UDP, 
length 172
23:12:52.418255 IP 192.168.2.2.12500 > 192.168.17.248.foliocorp: UDP, 
length 172
23:12:52.431439 IP 192.168.17.248.foliocorp > 192.168.2.2.12500: UDP, 
length 172
23:12:52.437959 IP 192.168.2.2.12500 > 192.168.17.248.foliocorp: UDP, 
length 172
23:12:52.451442 IP 192.168.17.248.foliocorp > 192.168.2.2.12500: UDP, 
length 172
23:12:52.457807 IP 192.168.2.2.12500 > 192.168.17.248.foliocorp: UDP, 
length 172
23:12:52.461792 IP 192.168.17.248.foliocorp > 192.168.2.2.12500: UDP, 
length 172
23:12:52.477710 IP 192.168.2.2.12500 > 192.168.17.248.foliocorp: UDP, 
length 172

Perry

On 08/04/2010 11:08 PM, Guus Sliepen wrote:
> On Wed, Aug 04, 2010 at 10:44:36PM +0200, Perry Couprie wrote:
>
>    
>> I want to use tinc for voip phones.
>>
>> How can i measure the overhead ?
>> Compared to a direct connection ?
>>
>> How can i reduce overhead when tunneling voip over tinc ?
>>      
> You can use tcpdump to see what packets are sent on an interface and how big
> they are. If you want to know latency, just use the ping command.
>
> Tinc will typically add one or a few milliseconds to the latency, and add
> around 80 bytes to each packet. You can decrease the size overhead slightly by
> changing the Cipher to something that can handle partial blocks, like
> blowfish-ofb for example. This will save you 4.5 bytes on average. You can also
> disable the Digest, this will save you another 4 bytes. So it is probably not
> worth it.
>
> Although in principle tinc adds only a millisecond or so to latency, it is a
> user-space program, and the operating system's scheduler can add more latency if
> other programs are running at the same time. So jitter is increased. You can
> minimise that by running tinc at a higher priority level (with the
> ProcessPriority option), or on Linux, you could in principle run it as a
> real-time process with the chrt command from the util-linux package.
>
>    
>
>
> _______________________________________________
> tinc mailing list
> tinc at tinc-vpn.org
> http://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc
>    

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