IPv4-only networks via IPv6-only network

[Guus Sliepen]

On Wed, Dec 03, 2003 at 07:43:12PM +0900, Ichiro Okajima wrote:

> But, I run into another problem. The round trip time of tunneled IPv4
> packets between two tincnized Redhat9 PCs fluctuates on the order of
> 0.532 to 10.554 ms, although that of IPv6 packets between them are
> very stable. Because I am planning to use a VoIP application between
> the two IPv4 network, stable RTTs of IPv4 packets are necessary.
> 
> Do you have any idea to improve the RTT?

Since tinc is a normal user-space program, it is subjected to the task
scheduler, which on i386 architectures normally switches tasks every 10
ms. So if there's another non-idle program running on those PCs, tinc
might not respond as quickly as when it's the only process running. You
can change this behaviour by giving it a higher priority with nice, or
you can let tinc run in realtime (use the chrt command from the
schedutils package for example).

> --- 192.168.20.2 ping statistics ---
> 100 packets transmitted, 100 received, 0% loss, time 99118ms
> rtt min/avg/max/mdev = 0.532/3.112/10.554/3.093 ms

On the other hand, it's only a 3 ms standard deviation, and a worst case
RTT of 10 ms. Doesn't seem that bad to me, even for VoIP!

-- 
Met vriendelijke groet / with kind regards,
    Guus Sliepen <guus at sliepen.eu.org>
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