some web sites need more than port 80?....

some web sites need more than port 80?....

[seberino]

I locked down my laptop with a firewall script to only
allow port 80.

I noticed that only the text gets downloaded from ucsd.edu.

It seems that the graphics from ucsd.edu could not get

through my firewall.


Do webs sites now send JPEGs in parallel with the text
on a different port or something?


chris

Re: some web sites need more than port 80?....

[Kenneth Kalmer]

On Sun, 6 Mar 2005 08:45:09 -0800, seberino@spawar.navy.mil
<seberino@spawar.navy.mil> wrote:
> I locked down my laptop with a firewall script to only
> allow port 80.
> 
> I noticed that only the text gets downloaded from ucsd.edu.
> 
> It seems that the graphics from ucsd.edu could not get
> 
> through my firewall.
> 
> Do webs sites now send JPEGs in parallel with the text
> on a different port or something?

Nope, something else is amiss. Maybe their server sends back the
images using unprivileged ports (> 1024). I've never seen this happen.
Tried any other sites?

I had a look at their HTML and everything is fine there...

> 
> chris
> 
> 


-- 

Kenneth Kalmer
kenneth.kalmer@gmail.com
http://opensourcery.blogspot.com

Re: some web sites need more than port 80?....

[Daniel Lopes]

seberino@spawar.navy.mil schrieb:
> I locked down my laptop with a firewall script to only
> allow port 80.
> 
> I noticed that only the text gets downloaded from ucsd.edu.
> 
> It seems that the graphics from ucsd.edu could not get
> 
> through my firewall.
> 
> 
> Do webs sites now send JPEGs in parallel with the text
> on a different port or something?
> 
> 
> chris
> 
> 

Take a look at the source code of the page. Perhaps it references the 
images from another webserver running on another port.

Re: some web sites need more than port 80?....

[Mohamed Eldesoky]

What are you blocking here ???
You talk to the webservers on port 80, but your local ports are not 80
for sure !!!
Actually, you should only blocking incoming packets to you, which are
new connections !!


On Sun, 06 Mar 2005 18:33:09 +0100, Daniel Lopes <lopsch@lopsch.com> wrote:
> seberino@spawar.navy.mil schrieb:
> > I locked down my laptop with a firewall script to only
> > allow port 80.
> >
> > I noticed that only the text gets downloaded from ucsd.edu.
> >
> > It seems that the graphics from ucsd.edu could not get
> >
> > through my firewall.
> >
> >
> > Do webs sites now send JPEGs in parallel with the text
> > on a different port or something?
> >
> >
> > chris
> >
> >
> 
> Take a look at the source code of the page. Perhaps it references the
> images from another webserver running on another port.
> 
> 


-- 
Mohamed Eldesoky
www.eldesoky.net
RHCE