Andrew Kohlsmith wrote:
On Saturday 28 April 2007 11:22 am, Chris Bagnall wrote:
Thanks to all who replied to my thread a few days ago "SIP devices with
packet loss tolerance". One of the suggestions that came out of that thread
was to replace routers at users' premises with ones that support QoS.
Sangoma S518 (internal PCI) on a Linux box with iproute2/iptables/tc or BSD
with pf. These are the best solutions, IMO.
The latest Linux kernels also have SIP connection tracking/matching, so it
should be possible to mark packets and prioritize based on iptables matching.
I have not done this just yet, as the latest 2.6.20/2.6.21 kernels do not
play nice with the wanrouter drivers.
(note: there was a recent patch to 2.6.20.4 which apparently has much better
SIP matching, and has been tested successfully with Asterisk. I have not
tested it yet, and the iptables guys have rejected the patch as their
direction for packet matching is shifting significantly in the near future.
It can be found at
http://thread.gmane.org/gmane.comp.security.firewalls.netfilter.devel/18860.)
I'm still looking for a miniPCI ADSL chipset that Linux can use, or an
actual "raw" ADSL non-PCI chipset that I can design into an embedded system.
If anyone has any leads, please don't hesitate to contact me!
Any chance we can get to see this as it sounds just what i'm looking for?
If you're curious, I have my rc.tc script for Linux up on
http://mixdown.ca/~andrew/rc.tc.
Forbidden
You don't have permission to access /~andrew/rc.tc on this server.
It's loosely based off of wondershaper, but
works much better, IMO. It does host-based prioritization for VOIP, puts
mail just underneath bulk traffic, and P2P beyond that (if you have the p2p
connmark stuff set). I can completely saturate DSL links with the S518 with
this config without appreciable VOIP degradation.
Even without an S518, this script works well with external ADSL/cable modems.
You may have to play with the upload rate; some cheap ADSL modems will
start "blocking" your upstream traffic beyond as little as 50% of the
upstream rate.
-A.
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Thanks
Bails
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