Re: [squid-users] Filtering based on content size.

On 28/04/11 17:56, Supratik Goswami wrote:
> @Amos
>
> Thanks for your reply.
>
> Currently I am using acl to filter file extension .exe, .iso, .zip and
> using with tcp_outgoing_address
> I am able to change the source IP and it is working fine with source
> based routing.
>
> I want to filter by size (Ex. 15MB) which I am unable to do it using
> ACL. On the other hand
> reply_body_max_size does filtering based on size but I am not able to
> use it as per my
> requirement.
>
> Is it a limitation of Squid ?

It is a limitation of this universe.

In HTTP the size of a reply is at best-case mentioned in the headers. At
which point the connection is already open and the request has already
been sent out.
  Worst-case the size is not known until the very last byte has been
received.

>
> Please let me know if there is any way to resolve this issue.

There is none which always works. The file extension guessing is nearly
close to as Squid can get. Beyond it you are doing things like manually
measuring individual sites and adding particular domains to the outgoing
address selection. Tedious never ending work.

My advice is to go for load balancing at the operating system level.
Load balancing works much simpler down there and you can do things like
NAT the outgoing address of new connections based on the proportion of
traffic each NIC has received so far (bumpy in the short term, but
averages out over many connections).

Amos

-- 
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