OK, back to basics then. It works when connected directly, that means the problem is in the router (duh ;-)) Reset the router to it's default settings, the manual should tell you how to do this. Next thing to check is if the ethernetcard of your PC is set to recieve it's IP from a DHCP server in the router. It probably has a fixed address, used by your ISP to connect you to their network. That IP address should be programmed into the router via it's web-interface. Then change the static IP address in your PC to DHCP, so the router can assign it an internal IP. When done, restart the networkcard.

In case it's a dns problem, how about posting the output of:
cat /etc/resolv.conf
ls -l /etc/resolv.conf

I agree with DutchMaster.. it's the router
GlaucoME, can you really confirm that it only happens with the router?
Do you experience downloading problems from the web?

Which debian is it? Or Ubuntu?

I'm using Debian now.
First i have installed Ubuntu and find this same problem, so i try the Debian.

My box is set to get IP from the DHCP Server on Router.
The cable modem get IP from DHCP too.

I agree that the problem is in Router, but i don't know where !!!!

I try again now, and i discovery something new:
I can't do 'apt-get update' connected to the router, but after do that connected directly in the cable-modem, i CAN do 'apt-get install xxxxx'.

That seems a little bizarre to me.


The outputs of resolv.conf:
cat:
nameserver 192.168.0.1 // Thats my router
ls -l:
-rw-r--r-- 1 root root 23 2007-07-06 09:43 /etc/resolv.conf


tks for the help everyone.

:~$cat /etc/resolv.conf
search dsl.inet.fi #my ISP
nameserver 193.210.18.18 #Primary ISP DNS
nameserver 193.210.19.19 #Secondary ISP DNS
nameserver 192.168.1.1 #My router

Sometimes routers don't give the isp's dns correctly to your linux box. Have a look at the modem and copy the dns addresses it has got from it's dhcp to your /etc/resolv.conf as in my example.

Back to Dutch initial post:

Can you click and see this file through the router:
http://security.debian.org/dists/sta...es/Release.gpg

?

I could see the Release.gpg file. But still can't do 'apt-get update'.

After that, i chance my resolv.conf and VOILÁ.
Finally it works.

But i still dont't understand how could everything works, except apt-get update, whitout this changes.

But nevermore, its working now.


Tks to everybody !!!

Ok. So my problem is solved.
What I did was the following:
1. I changed the MAC address of the ethernet adapter from FF:FF:FF:FF:FF:FF to 00:01:02:03:04:05
2. I ran dhclient. (IPs are assigned dynamically)
3. Rebooted my switch (optional, worked without it, so the problem is not the memory of the switch...)

This solved my problem, but I don't know why... but apt-get is working fine now...