[LARTC] Server and router on the same box

[LARTC] Server and router on the same box

[o7sh]

Hello list.
I'm trying to set up traffic shaping on a (web) server which is also a 
router(NAT) for my LAN.
It is connected to the LAN via Ethernet and also has PPP Internet connection 
on another interface.
I need traffic shaping to make sure that the upstream is fully available to 
the web-server when it's active so when a LAN client is bulk downloading the 
web-server clients won't wait for hours. Its kind giving high priority to the 
upstream and lowering the downstream.
it will be nice that when the web-server is not using any upstream, LAN 
clients will enjoy full bandwidth.
I've found lots of information on how to ensure downloading while uploading. 
but not on the reverse way.
Any idea for such a setup ?
Thanks.
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Re: [LARTC] Server and router on the same box

[Andreas Klauer]

On Wednesday 06 July 2005 22:53, o7sh@actcom.net.il wrote:
> it will be nice that when the web-server is not using any upstream, LAN
> clients will enjoy full bandwidth.

Somehow I doubt that traffic shaping is the right approach here; after all, 
we're talking about traffic on two different interfaces. There is no need 
to do shaping in that situation, because there is no way that traffic on 
interface A interferes with traffic on interface B (unless one is a 
virtual interface that actually uses the other to transfer).

Even if you put HTB on interface A, this qdisc has no way of knowing how 
much load there is on another interface. To shape multiple interfaces at 
once, you'd have to cheat by using IMQ or something like that.

If the fast transfer rates of the LAN puts too much load on your web 
server, the only thing you could do with traffic shaping here is to limit 
these transfer rates to a lower value at all times.

A better method would be to configure this in the webserver; tell the 
webserver that internet clients are more important than LAN clients. 
Depending on which webserver you use, this might be possible or not.

HTH
Andreas
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Re: [LARTC] Server and router on the same box

[o7sh]

Hi Andreas . And thank you for your reply.
> A better method would be to configure this in the webserver; tell the
> webserver that internet clients are more important than LAN clients.
> Depending on which webserver you use, this might be possible or not.
>
> HTH
> Andreas

The main problem is that LAN clients connect to other web-servers on the 
Internet via this box. in fact, any  Internet traffic they consume, even if 
they downloading, affect the upstream available for the web-server.

Well, If i don't find a "dynamic" solution. I don't care lowering the upstream 
available for the LAN all the time..
let's say I'll shape the upstream on the Ethernet, will it solve the problem ?
Thanks.

 
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Re: [LARTC] Server and router on the same box

[Andreas Klauer]

On Thursday 07 July 2005 10:51, o7sh@actcom.net.il wrote:
> The main problem is that LAN clients connect to other web-servers on the
> Internet via this box. in fact, any  Internet traffic they consume, even
> if they downloading, affect the upstream available for the web-server.

Oh, I'm sorry, I seem to have misunderstood. I thought the LAN clients were 
downloading from your web server, causing too much load for it. You were 
talking about Internet traffic, so that's a completely different story.

To make upstream fully available to your webserver, I suggest using a PRIO 
qdisc with 2 bands... band one for webserver traffic, band two for 
everything else.

The PRIO qdisc will make sure that your webserver always gets to send his 
packets first. LAN traffic will only be allowed to send when the webserver 
sent all his packets.

However, this means that your LAN will get effectively zero bandwidth as 
long as the webserver is working (someone downloading from it). If this is 
too harsh for you, use HTB instead - there you can specify whatever 
balance between web server and LAN traffic you wish (50-50 or 75-25).

HTH
Andreas
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Re: [LARTC] Server and router on the same box

[o7sh]

> To make upstream fully available to your webserver, I suggest using a PRIO
> qdisc with 2 bands... band one for webserver traffic, band two for
> everything else.
>
> The PRIO qdisc will make sure that your webserver always gets to send his
> packets first. LAN traffic will only be allowed to send when the webserver
> sent all his packets.
>
Hi again..
it sounds like just what I need but I find it hard to implement.
Here are my rules:
-----
tc qdisc add dev ppp0 root handle 1: prio
tc filter add dev ppp0 parent 1:0 protocol ip prio 1 u32 match ip sport 80 
0xffff flowid 1:1
tc filter add dev ppp0 parent 1:0 protocol ip prio 3 u32 
-----
I've been testing this for a while. But still got the dowload running while 
the upstream was full...
Can you explain why?

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