[LARTC] squid marking packets

[LARTC] squid marking packets

[Radoslav Kolev]

Hi all!
Does anyone know about some patch for squid allowing it to mark IP 
packets based
on if the request being served is a cache HIT or a MISS.
thanx
RAdo

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RE: [LARTC] squid marking packets

[Chris Harrison]

-----Original Message-----
From: Radoslav Kolev [mailto:radoslav_kolev@smartcom.bg] 
Sent: Monday, 22 July 2002 9:17 PM
To: Chris Harrison
Subject: Re: [LARTC] squid marking packets

Chris Harrison wrote:

>No, but how would it help anyway?
>
>The packets are on different OSI levels to begin with. 
>You could probably filter squid accessing the internet checking whether
>it's trying for a If-Modified-Since request or a Get Request...
>
>What exactly are you trying to do anyway?
>
>__________________________________________________________________
>Mr Chris Harrison
> 
>ICQ#: 354303
>EMAIL: theguru@ii.net
>__________________________________________________________________
>
>
>-----Original Message-----
>From: lartc-admin@mailman.ds9a.nl [mailto:lartc-admin@mailman.ds9a.nl]
>On Behalf Of Radoslav Kolev
>Sent: Monday, 22 July 2002 7:08 PM
>To: lartc@mailman.ds9a.nl
>Subject: [LARTC] squid marking packets
>
>Hi all!
>Does anyone know about some patch for squid allowing it to mark IP 
>packets based
>on if the request being served is a cache HIT or a MISS.
>thanx
>RAdo
>
>_______________________________________________
>LARTC mailing list / LARTC@mailman.ds9a.nl
>http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
>
>
>
>
Hi!
I want squid to put different marks on IP packets belonging to a 
connection between a client (web browser) and squid, depending on
if the file requested is served from the cache or fetched from the web 
server. By doing this I can send objects from the cache at full
speed to the clients (because these requests don't consume bandwidth to 
my ISP). If the object is not found in the cache i wan't to limit
the bandwidth consumed for fetching the object. I think that if I use 
squid delay pools they will not affect traffic serverd from the cache,
and this is what I want. The problem is that not all the traffic is 
passing through squid. I hope this makes it a bit more clear.
RAdo

----

After quite a bit of a search I found this which maybe of interest to
you.

http://www.squid-cache.org/mail-archive/squid-users/200005/0470.html

I think it basically states that delay pools only affect incoming data,
and therefore do not affect the rate of data retrieved that's already
cached.

HTH.

Chris


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Re: [LARTC] squid marking packets

[Radoslav Kolev]

>
>
>---
>Ok, I wasn't entirely sure what you meant - let me summarize and correct
>any mistakes I have made?
>
>1)	You use Squid for web traffic. (Is that all web traffic via
>transparent proxy, or do some clients not use the Squid cache for web?)
>2)	You have other traffic as well such as p2p, ftp, cs etc.
>3) 	You wish to rate-limit any web traffic traffic that isn't
>already in squid's cache.
>4)	You wish to rate-limit all other traffic that's not web also.
>
>If that is the case, then I would make your traffic classifiers handle
>all traffic, except for web traffic, and then use squid's delay pools to
>accommodate and differentiate between cached and non-cached content.
>
>
>Chris
>
>
>
Hi, Chris!
You are perfectly right! I use transperant proxy f?r the web traffic. 
The above lines describe it really well.
The problem with your suggestion is that there's no connection between 
squid and the for example HTB shaper for the other traffic.

I want Client X to have 64kbit guranteed bandwidth, and to be able to 
borrow up to 128kbit if available. My idea was to
make the HTB shaper not account packets belonging to connections of 
squid serving cached pages. I'm not sure, but it seems to me
that the easiest way to accomplish this is to make squid mark these 
packets and let them through at full speed (HTB 1:0 class). All
other traffic is classifies and shaped.

Thats how i understand your suggestion: make a class for Client X rate 
64kbit ceil 128kbit. Then I
don't shape packets coming from the proxy machine. But to what values 
should I limit the bandwidth at squid delay pools?
How would squid know that the user is already using his bandwidth 
playing CS, or doing
someting else squid isn't aware of. And vice versa HTB won't know how 
much bandwidth the user is consuming
through squid browsing the web. These problems would be solved if 
bandwidth is controlled using only one mechanism HTB or delay pools.
Since delay pools are limited to only http and possibli ftp, i think 
using HTB for both is a better choice. Thus I need a way to tell which 
packets
belong to connections served from the cache.

Rado


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