From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandru Dragoi Date: Sun, 24 Jun 2007 11:58:35 +0000 Subject: Re: [LARTC] Traffic shaping on multiple interfaces Message-Id: <467E5C6B.40607@zoomnet.ro> List-Id: References: <467E4B74.5030809@gmail.com> In-Reply-To: <467E4B74.5030809@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org Terry Baume wrote: > I'm trying to setup traffic shaping on my linux gateway/router. > > The system has 3 interfaces: > eth0 - My LAN - with IP address 192.168.0.254 > eth1 - The ethernet connection to which my ADSL modem is connected. > This has a 10.25.x.x IP, more on this later. The ADSL link has an > upstream of ~1.2mbit. > ppp0 - The PPP connection which is my WAN connection, with a real > world IP. > > The system acts a router, performing NAT for my LAN. This works > perfectly, as does traffic shaping on ppp0 - I get very good results. > > The trouble is that my ISP allows me to user another service over my > ADSL line, as a bonus. Basically the modem has 2 virtual circuits, one > being for my WAN connection, and the other being a private network > between other users of the same ISP, on the same telephone exchange - > this is where the 10.25.x.x IP on eth1 comes from. To make things > clear, low latency on the eth1 interface is not important, this > interface is only used for file sharing and such. Latency on ppp0 is > obviously important, being my WAN connection. > > My IPTables rules provide NAT for both connections, the only thing I > cannot get working correctly is traffic shaping. > > So far, I have experimented with wondershaper, shaping on the ppp0 > interface. This works well to keep latency down when traffic is on the > ppp0 interface. If there is traffic on eth1 (the 'private' network of > 10.25.x.x), with no traffic on the ppp0 interface, latency on ppp0 > remains low, regardless of whether traffic shaping is active. I > believe this has something to do with the way my ISP has configured > priorities at the telephone exchange. I begin to run in to trouble > when I am uploading heavily on eth1 & ppp0 simultaneously. Once this > happens, ping times over ppp0 rise dramatically, to well over 1200ms > (normal is around 7ms). I have tried shaping on eth1 instead of ppp0 > (as eth1 should contain all the packets for ppp0, I believe), but this > does not yield lower latency, though I did note that it did limit the > speed of the connection if I set the upstream and downstream values > absurdly low. > > I think what I need to do is somehow setup a script where traffic > directed to 10.25.0.0 on eth1 is somehow counted against the bandwidth > specified for ppp0, but I'm really not sure. Could someone offer some > advice? > > Thanks. > > I believe this is due to the fact that as outbound traffic is > occurring on both interfaces, tc does not worry about queues etc, as > it does not look as though ppp0 is being maxed out (ppp0 would only be > using roughly half of 1.2mbit), when the ADSL link itself is being > maxed out. > _______________________________________________ > LARTC mailing list > LARTC@mailman.ds9a.nl > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc Try using IMQ, from www.linuximq.net _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc