Michael Graves wrote:
On Wed, 04 Jan 2006 19:04:18 +0100, Matt Riddell wrote:
I don't use m0n0wall, but wouldn't it be better just to shape based on a Type
Of Service and then set the TOS flags in iax.conf and sip.conf accordingly?
--
Cheers,
Matt Riddell
In a more general sense yes, TOS based QoS is better as it relates to
outside your LAN. However, when using m0n0wall (great software!) it's
easiest to assign priority based upon source machine (your * server) IP
or port number.
The examples given previously in this thread are derived from the
built-in traffic shaping wizard. This establishes a series of weighted
ques for data. All you really need to do is be certain that the IAX
traffic is assigned to the highest priority que. Or all traffic to/from
your server can be assigned to the hi priority que.
It all sets up the same thing. Since QoS across the internet is pretty
hard to achieve there's some question as to the actual usefullness of
TOS bits. In future Telco/DSL providers may actually filter traffic
looking for TOS tags to deter your from voip applications.
Actually no, TOS is mostly useless because it has so few combinations,
and you have to trust the sender to have a clue. Unless it originates
from within your realm of control (most likely one of your LANs), then
TOS is the last thing you should trust. It is only useful when you want
to know the intent of the sender (which is seldom useful).
That is why most examples use source and/or destination port
specifications in addition to the IP addresses of the machines within
your network(s) when assigning packet priority. This prevents people
from taking advantage of your QoS rules.
When you an ISP it is critical to think of these scenarios. It doesn't
hurt to do it the same way in smaller setups where there is much less
chance of someone trying to take advantage.
Mike
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