can i by pass the proxy server

[vnykr]

hi
I am an MTech stud. from INDIAN INSTITUTE OF TECHNOLOGY. in our college we have a restriction on file size to be downloaded.that is we can download only files of size < 100MB.can i bypass that restriction ..and how??
i got an idea of using threads to break the file into parts and reassemble again after all threads finish their downloads...
is my idea will work?? and how i can proceed further...pls help me.i am a linux user but unable to do proceed further...

thanx alot..in advance

[Matti_Kurkela]

If your network admins have done their work well, bypassing the proxy will be practically impossible.

You might be able to disable the proxy settings in your browser. You might then find that the network's firewalls and/or routers are set up to allow WWW requests from workstations to go to the proxy only - so if you are not using the proxy, you are not getting anywhere at all.

Another method for the network admins is that the routers may be configured to forcibly redirect all WWW requests through the proxy (transparent proxying).

Most likely your idea will not work, if you cannot actually break the file into parts at the source server (i.e. make all the parts have different URLs). If you just request parts of the same file (actually, from the proxy's point of view, parts of the same URL's content), the proxy will re-join the operations. The proxy's primary purpose is to minimize bandwidth costs by optimizing traffic and caching data, after all.

Since the Service Packs for Microsoft Windows operating systems can be larger than 100MB, there is probably a local server at your college where network admins will make things like that available. You could make a request to the network admins: if the thing you're requesting is genuinely useful to several people, they might mirror that thing to a local server, so you could then access it with the full speed of the local network.

To really work around a proxy, you will need several things:
1.) a workstation with no admin-locked WWW proxy settings
2.) knowledge: if some traffic is allowed directly to the outside network without going through a proxy, you would need to know the port number(s) this kind of traffic uses.
3.) a proxy that you can control, located outside the college network. If you can configure this proxy to use the port number described in point 2) above and make your browser use this proxy instead of the college's proxy, you have your access.

Remember that the college's routers will probably collect traffic statistics by IP address. If your workstation shows up in the "top ten" of total traffic, someone is likely to notice it and investigate further. In any Institute of Technology, the network administrators will certainly have experience of many strange things done by students.

There are probably rules about allowed uses of the college network: if you get caught breaking them, you may lose your network access as a disciplinary action. This may make studying in an Institute of Technology rather more difficult. In extreme cases you may be expelled. Don't ruin your chances in life by being greedy.

[vnykr]

Mr. Matti Kurkela ..
Thanx for ur valuable advice and warning.

sir , i want to study about those proxy servers and do some research on those things. thats Y i asked abt that.
how to start and where to start?
how can i retain those traffic information of a proxy server??
which lang is most reliable for that??
i knew java upto some extent..
can i use that r need to do some home work ??
can u give some useful material on that??
thanQ very much .

[Kodjo Agbenu]

Hello,

Proxying is one of the measures usually taken by a network admin or sysadmin to prevent inadequate use of the network.

The best book I ever had on this is :

Building Internet Firewalls, Second Edition

By Elizabeth D. Zwicky, Simon Cooper, D. Brent Chapman
Second Edition June 2000
Pages: 894 (More details)

http://www.oreilly.com/catalog/fire2/index.html#top

Practically : if you have to - temporarily - be allowed a >100MB download, try to negotiate with your sysadmin. Other points : some proxy servers can be fine tuned to be more permissive depending on the time (eg : allowing >100MB files from 10pm to 6am).

Good lcuk.
Kodjo

[Steven E. Protter]

Shalom,

No, not without violating the rules and endangering your network privledges.

Contact Network Administration and maybe they'll raise the limit or provide a special bypass proxy for legitimate purpoases.

SEP

[vnykr]

no i dont find the soln..

hanx for ur suggestions