[Ilugc] Bandwidth Management opinion required
- From: mohan.tux@xxxxxxxxx (Mohan Sundaram)
- Date: Fri, 1 Feb 2013 20:02:58 +0530
On Fri, Feb 1, 2013 at 3:57 PM, Ravi Kumar Tenneti <rktenneti at gmail.com>
wrote:
We have tried the following with mixed results :
1. Squid with delay pools - download limits are working but uploads
limitation is not working.
One aspect that is most often missed is that traffic shaping using
which QoS is delivered is effective for outgoing traffic but is not
effective for incoming traffic on an interface. Ingress qdiscs also
fail miserably in a NAT scenario where the incoming traffic is all
destined to the gateway and the destination nodes are unknown till
after reverse NAT rewrites of the packet (happens post where Ingress
qdiscs are applied).
The method that I found that works well for controlling both ingress
and egress traffic to the internet is to:
(a) Configure the gateway as a bridged/transparent gateway (both
interfaces in the same subnet with forwarding of traffic from one
interface to another). No reconfiguring of the network is needed (bump
in the wire scenario).
(b) Apply egress qdiscs on the internet facing interface to shape
outgoing traffic.
(c) Apply egress qdiscs on the LAN facing interface to shape incoming
traffic from the internet.
Howtos exist for this. I wrote and maintained user documentation
chapters for bridging[1] and bridged QoS[2] for an embedded linux
distro called LEAF (it has been static for a long time now :( ). Other
good ones exists especially in LARTC though they are more generic.
Links:
[1]
http://leaf.sourceforge.net/doc/bubridge.html
[2]
http://leaf.sourceforge.net/doc/buhtb-qos.html
-- Mohan Sundaram
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