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Old 04-27-2005, 11:27 PM   #1
Registered: Mar 2005
Distribution: Red Hat 9.0
Posts: 94

Rep: Reputation: 15
DNS does not respond

I use RH Linux 9.0.
To connect to the net my ISP has given me an application called crclient.
i login to this application by ./crclient -u username & password.
He has also given me the IP,Subnet,Default gateway,DNS1,DNS2 addresses.
I have entered these data.
Now I am able to ping the IP,subnet successfully.
DNS doesn't respond.
The same adresses work in my Windows 2K m/c.
Am i missing out on any other configuration?
Is there is a checklist I need to go through?
I am new to Linux,any help would be appreciated..

Old 04-28-2005, 04:19 AM   #2
Registered: Dec 2003
Distribution: Slackware, Alpine Linux, Ubuntu, Debian
Posts: 219

Rep: Reputation: 35
Try to disable iptables. Login as root and write this:
iptables -F
if this returns error, try this (if iptables -F is successful, it wont return anything):
whereis iptables
You will get the absolute path to the file iptables (if exists). Copy the path and run:
<absolute_path> -F
if this is still returning error messages, try to run:
services iptables stop
Now try your application again. If the thing works, scan your network traffic with Ethereal (, so you'll see what ports do you have to open. To open your ports just use the Firewall GUI which (i'm pretty sure) is installed with RH 9.0.

If the application is not working despite you have flushed iptables, then also use Ethereal, maybe you can find out what's wrong, but if it's working on windows, than i suppose the problem are iptables!

Last edited by zWaR; 04-28-2005 at 04:21 AM.
Old 05-11-2005, 07:24 PM   #3
Registered: Mar 2005
Distribution: Red Hat 9.0
Posts: 94

Original Poster
Rep: Reputation: 15
thanks zWAR..

the problem got was setting to static ip and configuring my ISp client that did that trick..

thanks again for the very useful info on iptables...Very neatly put fr a newbie like me..



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