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Using SQUID to reduce traffic usage in the office - how effective?
Post 302264353 by juhanitali on Wednesday 3rd of December 2008 05:29:17 PM
12-03-2008
Quote:
We are working in the office where about 5-6 machines have Internet access. We pay for each GB of traffic we consume and that's quite expensive. Almost no worker download files. Just surfing websites (including our corporate one that is located outside of local network thus we pay for accessing it too).
I am thinking of purchasing low-end cheap PC to install SQUID and setup NAT to direct all office internet traffic through it.
Should I expect traffic consumption reduce counted by ISP in this case at all? If yes, what is the estimated factor of bandwidth consumtion reduce? I understand, that that depends on what internet sites are the staff surfs etc etc. I just care about something average coming from someone's practice. Increasing SQUID HDD cache to 10-20Gb is not a big problem I think. HDDs are pretty big and cheap nowadays.
I am thinking of purchasing low-end cheap PC to install SQUID and setup NAT to direct all office internet traffic through it.
Should I expect traffic consumption reduce counted by ISP in this case at all? If yes, what is the estimated factor of bandwidth consumtion reduce? I understand, that that depends on what internet sites are the staff surfs etc etc. I just care about something average coming from someone's practice. Increasing SQUID HDD cache to 10-20Gb is not a big problem I think. HDDs are pretty big and cheap nowadays.
quick answer: forget squid. Won't help enough. Probably around 20%.
Better try to "upgrade" the pc-s web browsers, flashblock, adblock, maybe noscript etc but please don't overdo it. Maybe kill yourtube, but usually it is better to get a better network connection, for corporate web surfing
long way:
think about the problem, how important it is for you. Are you sure that somebody will say thanks to you if you micromanage their web surfing habits? Is it really worth spending your time in days?
If you decide that it is worth the hassle, then you should analyze the traffic. And go from there. In analyzing, the squid-s access.logs are a simple place to look. So you can use squid, but mostly just to get the logs.
We used to run squids in front of all gov users (tens of thousands of users, out-of-country access logs were 2-3G/day) but at the present time it is better just to buy slightly more bandwidth, most of the traffic is not cacheable. Besides, squid is single threaded - will use only 1 cpu.
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LEARN ABOUT DEBIAN
squid3_session
squid_session(8) System Manager's Manual squid_session(8) NAME
squid_session - Squid session tracking external acl group helper SYNOPSIS
squid_session [-t idle_timeout] [-b dbpath] [-a] DESCRIPTION
This helper maintains a concept of sessions by monitoring requests and timing out sessions if no requests have been seen for the idle time- out timer. Intended use is for displaying "terms of use" pages, ad popups etc. -t idletimeout (default 3600) Specifies the session idle timeout timer. -b dbpath Path to persistent database. If not specified the session details will be kept in memory only and all sessions will reset each time Squid restarts it's helpers (Squid restart or rotation of logs). -a Active mode. In this mode sessions are started by evaluating an acl with the argument LOGIN, or terminated by the argument LOGOUT. Without this flag the helper automatically starts the session after the first request. EXAMPLE
Configuration example using the default automatic mode external_acl_type session ttl=300 negative_ttl=0 children=1 concurrency=200 %LOGIN /usr/local/squid/libexec/squid_session acl session external session http_access deny !session deny_info http://your.server/bannerpage?url=%s session Then set up http://your.server/bannerpage to display a session startup page and then redirect the user back to the requested URL given in the url query parameter. AUTHOR
This helper and documentation was written by Henrik Nordstrom <henrik@henriknordstrom.net> QUESTIONS
Any questions on usage can be sent to Squid Users <squid-users@squid-cache.org>. REPORTING BUGS
Report bugs or bug-fixes to Squid Bugs <squid-bugs@squid-cache.org> or ideas for new improvements to Squid Developers <squid-dev@squid- cache.org> SEE ALSO
squid(8) Version 1.0 19 March 2006 squid_session(8)