[Asterisk-Users] QoS What to do?

[Adams, Gavin]

> -----Original Message-----
> From: Perry E. Metzger [mailto:perry at piermont.com]
> 
> 
> fred alexander <fredvoip at yahoo.com> writes:
> > Can anyone share what has to be done to secure the
> > voice and throttle back the data?
> 
> Many routers allow you to prioritize certain types of traffic --
> effectively letting the packets "jump the queue". If you strictly
> prioritize the voice packets over data packets, you'll probably do
> quite well.

For Cisco routers, look at the fair-queuing modes (but stay away from
weighted fair queuing as that can have a deleterious effect on VoIP
traffic).

Under Linux, check out http://lartc.org/ which deals with configuring
routing under Linux with traffic shaping.

For asymmetric configurations such as Cable/DSL, if you are willing to
lower your download by and upload speeds by a bit, you can get nominal
quality even with large downloads that would normally saturate your
link.

Under Cisco, look to setup multiple queues at different priorities.
These can then be assigned to the WAN links (serial, etc). For Linux,
look at http://lartc.org/howto/lartc.cookbook.ultimate-tc.html. That's
what I use at home with my Vonage connection (soon to be a trunk line to
my * install :). Drops download speeds from 1.5Mbit to about 1.4Mbit and
uploads go from 256Kbit to 210Kbit.

You're on your own across the Internet as a whole, but in the past 3
years I have seen very little to no tier 1 or tier 2 provider
congestion, including trans-atlantic connections. YMMV, IMHO, etc.

Regards,

--- Gavin