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web browser traffic

L

lazybum550

Member
Hey guys,

I was wondering what the tcp/ip traffic looks like when you request a web page from a web browser.
I know that it runs on http (port 80). However while looking at some ethereal data I found that the browser sends traffic out on some random port that get redirected to port 80. Is domain name resolution the reason for that?
 
That's the way systems work. Ephemeral ports (above 1023) are generally used to send requests to privileged ports (0-1023). The privileged ports generally require administrator/root level access to connect to, but ephemeral ports do not. So a regular user can bind to higher ports. If browsing the web required you to use port 80 locally, only administrators/root could browse the web.
 
you would see a requrest from a high level port (your local port) go to the http server on port 80, and then see a reply (iirc, been a while) on port 80 from the server, to the high level port on your machine (several, actually, as it sends all the data required)
 
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