Home News Forum
  Welcome back Join
You are here You are here: Home | Discussion Forum

Articles Connection Reported Posts Top Posters
Go Back   Cable Forum Test Site 1 > Website > Information Section > Articles

How a Proxy Server works
Reply
 
Thread Tools
Old 03-03-2006, 20:15   #1
Zippy 4
Super Moderator
 
Join Date: Sep 2003
Age: 47
Posts: 9
Zippy 4 is an unknown quantity at this point
How a Proxy Server works

Summary

This article attempts to describe how your web browser fetches pages from the World Wide Web for a variety of methods, including transparent and non-transparent web cahces.

More Information


Without any proxy
  1. Your PC does a dns lookup of the required domain using its own (locally) defined dns servers.
  2. It sends the http request on tcp port 80 to the destination server?s IP address.
  3. This request is routed over the network direct to the specified server IP.
  4. The requested page is then returned, by the server, direct to the client.

Using a manually defined proxy
  1. Your PC does a dns lookup of the proxy servers IP using its own (locally) defined dns servers.
  2. It sends the http request on tcp port 8080 to the proxy servers IP address.
  3. This request is routed over the network direct to the specified proxy server IP.
  4. The proxy server checks if it has a valid copy of the requested page in its cache (using the domain name, not IP address).
  5. If the proxy has the page it returns it directly back to the client ? job done.
  6. If the proxy does not have the page it does a dns lookup of the requested domain using it?s own defined dns servers.
  7. The proxy sends the http request on tcp port 80 to the destination servers IP address.
  8. This request is routed over the network direct to the destination servers IP.
  9. The requested page is then returned, by the destination server, directly back to the proxy server.
  10. The requested page is then returned, by the proxy server, direct to the client.

Transparent Proxy (if you have no manually defined proxy, but NTL?s proxies are active)
  1. Your PC does a dns lookup of the destination servers IP using its own (locally) defined dns servers.
  2. It sends the http request on tcp port 80 to the destination servers IP address.
  3. This request is intercepted by NTL?s routers and re-directed to one of a group of transparent proxy [cache] servers ? the decision on which proxy server gets used is based on the requested domains IP address.
  4. The chosen proxy server checks if it has a valid copy of the requested page in its cache (using the domain name, not IP address).
  5. If the proxy has the page it returns it directly back to the client, Job done.
  6. If the proxy does not have the page it does a dns lookup of the requested domain using it?s own defined dns servers.
  7. The proxy sends the http request on tcp port 80 to the destination servers IP address.
  8. This request is routed over the network direct to the destination servers IP.
  9. The requested page is then returned, by the destination server, directly back to the proxy server.
  10. The requested page is then returned, by the proxy server, direct to the client.
This article was originally written by Paul M on the CF forum.
Zippy 4 is offline   Reply With Quote
Google Adverts
Old 25-06-2008, 16:33   #2
Jules
Member
 
Join Date: Sep 2006
Posts: 55
Jules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scale
Jules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scaleJules is off the scale
Re: How a Proxy Server works

Who is Zippy 4 lol
Jules is offline   Reply With Quote
Old 25-06-2008, 16:54   #3
Paul M
The Master
 
Paul M's Avatar
 
Join Date: Apr 2004
Location: 2
Posts: 519
Paul M has a spectacular aura aboutPaul M has a spectacular aura aboutPaul M has a spectacular aura about
Re: How a Proxy Server works

Zippy 3's brother.
__________________

http://romulas.zmnt.co.uk/digiguide/images/CF2.JPG
<a href="http://romulas.zmnt.co.uk/digiguide/images/CF2.JPG">TEST of HTML</a>
Paul M is offline   Reply With Quote
Old 25-06-2008, 16:55   #4
Zinglebarb
Member
 
Join Date: Jan 2006
Posts: 86
Zinglebarb is an unknown quantity at this point
Re: How a Proxy Server works

younger or older?? is the 4 his age or order of birth
Zinglebarb is offline   Reply With Quote
Old 25-06-2008, 17:07   #5
Rob
Pass me the Banhammer
 
Rob's Avatar
 
Join Date: Jul 2005
Posts: 204
Rob is an unknown quantity at this point
Re: How a Proxy Server works

Quote:
Originally Posted by Jules View Post
Who is Zippy 4 lol
A relative of Bungle ?
Rob is offline   Reply With Quote
Old 25-06-2008, 20:38   #6
wicked_and_Crazy
Junior Member
 
Join Date: Jun 2008
Posts: 4
wicked_and_Crazy is an unknown quantity at this point
Re: How a Proxy Server works

Quote:
Originally Posted by Rob View Post
A relative of Bungle ?
Should be a good mod then haha bungle things hahaha
wicked_and_Crazy is offline   Reply With Quote
Old 25-06-2008, 22:15   #7
Bungle
Junior Member
 
Bungle's Avatar
 
Join Date: Jun 2008
Posts: 8
Bungle is on a distinguished road
Re: How a Proxy Server works

Someone mentioned my name?
Bungle is offline   Reply With Quote
Old 25-06-2008, 22:38   #8
Zinglebarb
Member
 
Join Date: Jan 2006
Posts: 86
Zinglebarb is an unknown quantity at this point
Re: How a Proxy Server works

Yes Matt lol lol
Zinglebarb is offline   Reply With Quote
Old 25-06-2008, 22:48   #9
Graham M
Senior Member
 
Join Date: Dec 2005
Posts: 103
Graham M is on a distinguished road
Re: How a Proxy Server works

Quote:
Originally Posted by David F View Post
Yes Matt lol lol
Nice bit of investigation
__________________
Formerly Zeph
Graham M is offline   Reply With Quote
Old 25-06-2008, 22:54   #10
Rob
Pass me the Banhammer
 
Rob's Avatar
 
Join Date: Jul 2005
Posts: 204
Rob is an unknown quantity at this point
Re: How a Proxy Server works

There were a few big clues in the mods area
Rob is offline   Reply With Quote
Old 26-06-2008, 14:47   #11
madeulook
Junior Member
 
Join Date: Jun 2008
Posts: 20
madeulook can only hope to improve
Re: How a Proxy Server works

I think someone Bungled his identity
madeulook is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 21:12.

Links
Google
 
Web www.cableforum.co.uk



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright Cable Forum 2017
(cadmium.zmnt.uk)

Cable Forum Test | Copyright 2018 | Hosted by Vultr VPS | Privacy Policy | Terms of Use