Hey there
I have a problem with my internet browsers. I try to use firefox and Konquerror in my BackTrack(Slackware) and i get an error like i typed an invalid url.
My network is fine as soon as when i boot from the Live cd i can use my browsers without any problem
I decided to reinstall my Linux and in the beginning my browser were working fine but on the next reboot i had the same problem that i described. Any ideas what can cause that problem?

Many thanks for your time

Your description isn't clear enough (for me, that is) but some things you can try:

- is your connection on? using ifconfig see if you have ppp0 connection (if you're using dialup or pppoe-DSL):
you should then have a ppp0 (or if you just have a DSL that never asks passwords i.e. is always "on", and connected to your primary ethernet card, eth0) which should show your internet ip address. Check if it's ok; if it's not, your connection needs to be first configured and established (more about this later on).

- if your connection is ok, i.e. you have an ip, try to ping an ip address rather than domainname (ping x.x.x.x rather than ping google.com); if the ping gives replies, the problem is your DHCP isn't ok (or manually set) and DNS servers are missing.

- if you can't ping those either, but you have a connection (ppp link is up, for example), try this (I still haven't found out what's wrong with this): close the connection, disable your device where the connection is coming from (usually eth0 on DSL connections), then restart the connection. For some reason if the connection is established when your machine boots, configuring the rest of the ethernet stuff might fuss your (dhcp) settings. For example, for a DSL pppoe connection configured trough pppoeconf or adsl-config, either of these:
the latter one is for distributions where pppoe-start is called adsl-start (try pppoe-start instead of pon too, if it's not found).

If you need to configure a connection, you can use several tools. For DSL (pppoe) I use pppoeconf (adsl-setup), which is text based tool and needs to be run once. After that 'pon dsl-provider' and 'poff' work. For dialups, either one of those graphical tools like Kppp or then something like wvdial.

Hey there
This is the output of ifconfig -a(display all even an interface is down).
Without -a option, lo is only displayed.
Shall i try the last piece of code that you gave me

Hey again
Ok, lets describe my case better. Well, something weird is going on
My web-surfing is quite unstable. Sometimes when i boot my machine everything is fine and in some others I can not access a URL.
I have used ifconfig in both cases (meaning being able and unable to access the web). What i posted before is while I am unable to access the web. I believe that worths to say that the first time of that unstability occured when i used the ping command to a URL which worked fine. On the next reboot I could access the web.
Can ping caused a problem? Right now that i am writing this message everything is fine but unfortunately i believe that on next reboot I wont connect again
I just also tried what you said before, ping to x.x.x.x and it worked.

Hey again!!!
I would like to thank you beforehand for your previous reply. It was fully analytical.
Unfortunately I am quite newbie and i would like your help once more again.
I want to try the piece of code that you provided.
This is all of pppoe that i have
As you mentioned on your last lines of your reply the first thing that is needed so the script that you provided will be able to work is 'pppoeconfig'. As you can see there is no pppoeconfig in my machine(BackTrack). Any idea what could be equivalent?

Thanks for your time

PS:Sorry for posting so much

What happens when YOU try "/etc/init.d/network start"? When YOU installed the Distro "BackTrack", did YOU name the two DNS Servers with [xxx.xxx.xxx.xxx] ? Did YOU setup Networking? If YOU setup Networking, did YOU enable it to start at Boot Up? Please post answers.