UNIX for Dummies Questions & Answers

Hi all

I got a problem that I need to solve here, its kinda confusing me.

I got servers which is RHEL that its not supposed to connect to internet, but right now I want this server to connect to internet, so firewall and everything already open. but I have no idea why it still unable to connect to internet.

I restart the network in /etc/rc.d/init.d network stop and start it back, I tried but still same thing. FYI, IP, subnet, DNS already configured just like the other machines(windows xp which is connected to internet) we are using same dns, so it supposed to be fine or is not the problem with this configuration.

I try to tick the httpd under 'services' and start it so it was running, but I tried again to connect to internet by typing google.com or yahoo.com into the firefox and konqueror, but it is still the same! sad,...

any idea on how to solve this issue? appreciate!

Thanks

Run all commands as root:

1. ifconfig -a
Do you see an interface marked "UP" with a MAX address and a non-zero IP address?? (Not including "lo" interfaces.) If not, you don't have a working ethernet driver installed.

2. Can you ping the IP address of the interface? (for instance, eth0) If not, you have a network stack issue. Perhaps the network interfaces were disabled or perhaps there is a driver problem. It can also be a routing problem. Check "netstat -rn" and make sure you only have the default route.

3. Can you ping another host or gateway on the LAN? If not, perhaps iptables still has some rules installed. Do "/sbin/service iptables save" and check /etc/sysconfig/iptables.save for any rules which still shouldn't be there.

4. Can any other machine on the network ping the address? If so, it could be a cable problem. Or, it could be there already is another machine on the network with that IP address. Change IP addresses and try again.

5. Check the default route. You didn't mention this in the list above. Run "netstat -rn" to see the list of routes. The route listed for "default" should point to your switch or local gateway. Try changing this to another machine on the network.

6. If you can get to the router, but not past the router, the problem might be there or on a further hop. Use "traceroute -n www.google.com" or something to trace your route to the internet. If it stops after 1 or 2 hops, the problem is your gateway

@otheus: good explanation, appreciate it! I'm able to connect to internet now, I know its not my fault since first time. The network teams did not configure the firewall and vpn correctly, so thats why I was not able to connect to internet.

Thank You for your reply and help.