QoS for VoIP

Linux Advanced Routing and Traffic Control

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Hi all,

I would like to prioritise all VoIP traffic on a linux router. I am new
to QoS, tc and TOS, to please be gentle.

My logic works like this:

1) identify the VoIP packets
2) mark packets using iptables (with TOS?)
3) use tc to prioritise the marked packets.

Is this logic correct? If not, where is it flawed?

I understand that VoIP used the udp protocol and has packet sized less
than 250 bytes. Is simply reducing the MTU on the interfaces good enough
to give better thoughput, without the lag of larger packets trying to
pass though?

Are there any good HOWTOS?

TIA

Regards
Craig
--
Craig Main
RHCE
ST Solutions
Cell: 082-323-4670
Home Tel: 011-760-1900
AIM: SATuxman; ICQ: 75815570
http://www.stsolutions.co.za
http://www.linuxsa.com


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