Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

So my school uses a firewall called smoothwall to keep us from going to a various number of websites, so i figured out that using a proxy server, in this case its Tor, would let me get past web panel that pops up. How exactly does this work?

firewalls block incoming traffic, correct?

and proxies only disguise your ip to the web server right?

so in theory smoothwall should block the website no matter what, right?

sorry i'm just confused about this whole topic and because most of you on here seem like pretty smart individuals i figured i'd just ask

thanks in advance for answers :)

Edit:

My school uses a firewall called Smoothwall to keep us from going to a various number of websites, so I figured out that using a proxy server, in this case its Tor, would get past the firewall. How exactly does this work?

Since the proxy only changes your IP how does it get round the filter since the web request would still remain the same.

share|improve this question
    
When you try to circumvent your school's firewall you should keep in mind that this firewall was put up for a reason. It is very likely that you can get in quite serious trouble when you get caught—and for good reason, too. Just some advice; I cannot answer the rest of question, though. –  Vucar Timnärakrul Mar 6 at 14:41
    
Tor does a bit more than just "change your IP." It maintains connections to other Tor nodes, creates circuits, and encrypts your traffic before sending it out. –  ultrasawblade Mar 6 at 15:37
    
@Vucar thanks i know i was only using it to get to an online textbook because the firewall was going whack and blocking everything, –  TheAmazing_OMEGA Mar 6 at 16:20
    
@ultrasawblade yeah sorry i was wrong about "changes your ip" i know how it works now thanks for the info about Tor though :) –  TheAmazing_OMEGA Mar 6 at 16:21

2 Answers 2

the way a web-proxy works in this case is that it fetches the site on your behalf.

For instance, lets say that your school blocks Facebook.. Im simplest terms, this is roughly what happens:

  • Your Firewall blocks Facebook
  • You go to the proxy - not facebook.
  • The proxy requests Facebooks homepage for itself, not you.
  • The proxy's firewall isnt blocking facebook.
  • The proxy displays the content from its own website to you
  • Your school firewall sees incoming traffic from "Tor".. not Facebook
  • The proxy doesn't block it.
  • You see the site.

Proxies don't just hide your IP, they fetch a site on your behalf and present it as if it was their content. The Web servers at Facebook would be getting a request from Tor - not you, this is how the "hiding your IP" portion of proxying comes into play.

Make sense? Also, its worth noting that if the school goes to the effort of blocking stuff, they probably monitor traffic and will investigate heaps of traffic going to Tor.

Also, lots of schools also block anonymisers and proxies too.

Lastly - you will get in heaps of trouble if caught, so don't do it.. but since your question was more of a "how does it work?" instead of a "How can I?" There's your answer

share|improve this answer
    
Really glad it helps... Just don't do anything stupid and get yourself in trouble at school.. its not worth it. –  Fazer87 Mar 6 at 14:50
    
Some proxies, such as Tor for example, will also encrypt your traffic, which also makes it difficult for content filters to block your traffic. –  heavyd Mar 6 at 14:59
    
alright thanks that clarifies a lot! i was actually using Tor to get to an online textbook because the firewall went whack and started blocking everything but a few sites. i actually was wondering about this because i was talking with one of the moms who drives my carpool, and we were trying to figure out if Tor could be blocked long story short we ended up discussing this issue. Also Tor works on a network of relay points that exist all around the world with different iP addresses for each one so it would be pretty difficult to block, No? –  TheAmazing_OMEGA Mar 6 at 15:01
    
Depends on the firewall... If the firewall can only block IPs, yes its difficult - if it can block host/domain names (tor.xyz) or wildcards (tor) then its a lot easier. A college I once worked for blocked (youtube) and a couple of other subdomains - a lot easier than hundreds of IPs –  Fazer87 Mar 6 at 15:06
    
so i seems that Tor exit nodes can be blocked and there's a list published online hmmm..... i honestly do wonder if the IT guys here will actually block Tor.... –  TheAmazing_OMEGA Mar 6 at 15:42

If you're using Tor to access websites, it also uses Peer-to-peer connexions to get to a website, it's like using a simple proxy server, but in large scale and spread in all over the world. Tor will fetch the website from a computer (like mine for example) that has a non-blocked internet access for you.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.