Thank you for you excellent reply. The VPN will be IPSEC
monowall-to-monowall in a star configuration connecting remote locations
to the central office with the SIP server. So it would seem that I can
do traffic shaping on the WAN interface. I believe my scenerio is much
like yours. Currently the site is using non-monowall devices that do not
support QoS and it is causing problems with voice quality. I wanted to
be sure the m0n0wall solution would work before convincing them to swap
out their equipment.
From: Marc Fargas [mailto:telenieko at gmail dot com]
Sent: Thursday, May 18, 2006 5:53 PM
To: Josh Simoneau
Cc: m0n0wall at lists dot m0n0 dot ch
Subject: Re: [m0n0wall] Traffic shaping over VPN for VoIP?
You have some options here, If the VPN is handled between m0n0 and the
Internet OR it is an IPSec one, you can define your traffic shaping on
the WAN interface taking care of traffic on ports 5060 & 5004 to be
highest priority, and traffic going from or to the SIP proxy (It will
depend if your devices can re-invite or use random SDP/RTP ports)
In case the VPN is done on the m0n0 box but is not IPSec you'll have to
get the shaping done on LAN because traffic on WAN will be inside the
VPN and therefore you won't be able to distinguish VoIP traffic from
other VPN traffic, take care that placing the shaping on the LAN
interface means that download/upload means the opposite of what it means
on WAN (seen from m0n0).
In case the VPN is done on the LAN by another device... you can only
"match" the VPN traffic as is on the traffic shaping without knowing if
it's VoIP or anything else.
I'm not sure if m0n0 can match QoS fields (have no box at hand now to
look at), if it can you can 'tag' the packets on the device (if it
supports so) or on the VPN software (I think openvpn had the ability to
'respect' the QoS on tunneled packets) that could help on case 3 above.
Hope it helps a bit, on my case I'm in the first case of the list, IPSec
tunnels between some offices (fully-meshed) and SIP traffic between
them, traffic shaping is done on WAN on ports 5060 and 5004 as my
devices allow me to specify ports. And it works fine (I can start
massive downloads without downgrading the voice quallity).
On 5/18/06, Josh Simoneau <jsimoneau at lmtcs dot com> wrote:
I wasn't able to get a definite answer searching through the
maybe someone here can tell me if they have had success with
want to put an VoIP server at one location, and then have two
locations connect to this over a VPN. Each location will have
private subnet. I want to ensure that m0n0wall is capable of
traffic shaping (is this considered QoS or is there something
about traffic shaping that keeps it from using the QoS label?)
VPN connection so that voice calls remain the highest priority.
be using standard SIP stuff.
I have done many m0n0wall VPNs and many traffic shaping
but never traffic shaping over the VPN. I just want to be 100%
will work before I move forward with the project.
Inventor of Electricity
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