Hi,

Im connecting with Internet via a proxy server. (Akademic Campus).
Where should I put a proxy-name and port number in Debian. Without this I can't use a apt-get command and I can't even ping a www site.

hi ,
goto edit->preferences in mozilla firefox,there u can find connection settings button , click that and give ur proxy address and port no
regards,
tom.

In Web Browser it ist everything allright. Problem is to make it in the Terminal, so the apt-get command would be properly perfomed.

Hi, be welcome.
To be able of running a command throu a proxy without writing its address every time you type it, better define proxy address and port in your profile file, e.g,:
HTTP_PROXY=http://192.168.1.1:8080
HTTPS_PROXY=http://192.168.1.1:8080
FTP_PROXY=http://192.168.1.1:8080
Replace ip and port with the one applicable to your case.
Then you can edit your /etc/apt/apt.conf file:
Acquire::http::Proxy "false";
Change "false" for "true"
You have options to not use the proxy cache, edit the timeout, ftp access, etc. For better results read the "man apt.conf".
Cheers.

I made as u said but still doesn't work. In Browser it is ok. But in console not. When I ping any www-site I have no response

OK, you are having networking newbie behaviour. I see what you call Proxy is possibly your gateway too, as far as you didn't say if you configured your gateway, pay attention to this:
- If you don't read much and you are in a hurry:
# route add default qw ${GATEWAY} metric 1

Understand? You add your default gateway to your network configuration there, replace ${GATEWAY} with your gw ip. Proxy and Gateway are two very different concepts.

- But, if it doesn't work and you want something more "static", instead of typing the command above avery time you get to your campus network:
In your /etc/sysconfig/network (I don't know if it exists in Debian, debianites needed here):
NETWORKING=yes
HOSTNAME=yourbox.yourcampus.com
GATEWAY=192.168.1.1 (the ip of your campus gateway)

In your /etc/hosts:
127.0.0.1 localhost.localdomain localhost
192.168.1.1 yourbox.yourcampus.com yourbox yourcampus.com

In your /etc/resolv.conf:

# search for resolution in your campus if needed, if not, comment it.
search yourcampus.com
#
# Replace the next one with your campus DNS ip, if needed, if not, comment it.
nameserver 192.168.1.1
#
# ISP DNS ip's if needed, if not, comment it.
nameserver 200.33.213.66
nameserver 200.33.209.66

Orrr... you can use some script, under your own risk:

#! /bin/sh
inconfig lo 127.0.0.1
route add -net 127.0.0.0
IPADDR=192.168.1.10
NETMASK=255.255.255.0
BROADCAST=192.168.1.255
GATEWAY=192.168.1.1
ifconfig eth0 ${IPADDR} netmask ${NETMASK} broadcast ${BROADCAST}
route add default qw ${GATEWAY} metric 1

... defining all the ip's and the ethX device in the script file.

I'm tired of writing, you _have_ to give me more data if you need more help.

EDIT: Being a campus network there is a big chance of having dhcp available, you can configure your device, let's say eth0 with "dhclient eth0" for having all the network services available, like internet access.