Linux Noob Question RE internet access.

[Mars]

If I putty into my CentOS server and try o do an update it tells me that he network is unreachable.
If I ping Google it also says network unreachable, however I can ping any machine on the local network.

I know I used to be able to access the internet from this box, what could have changed to stop it from accessing it now?

 

[w1z4rd]

Can you ping an internet ip? like 8.8.8.8? If you can your problem is dns and you can fix it by editing /etc/resolv.conf.

If not, you need to setup a gateway, dns and routing.

 

[Tinuva]

He probably doesn't have a default gateway set.

 

[Mars]

I cannot ping 8.8.8.8

I checked resolv.conf. and the only thing in it is the default gateway...

I know I had internet access on this machine before.

 

[Silver-0-surfer]

resolv.conf is not for the default gw its for DNS.

check /etc/sysconfig/network-scripts/ifcfg-eth0 (if you using eth0) that should have default gw, netmask etc..
check if all thats right

 

[MyWorld]

In resolv.conf change the settings to the IP of your router like so:

nameserver 192.168.0.1

 

[w1z4rd]

Whats the ip of your router?

When you type: ifconfig what is the print out?

If you know the ip of your router/gateway then enter this command:

route add default gw 192.168.1.254 eth0

Just make sure the ip listed as 192.168.1.254 is the ip of your router/gateway

In resolv.conf you should have:

nameserver 192.168.1.254

Where once again the IP is that of your router/gateway

 

[avert]

or if your router is running dhcp, like 99% of them do

dhclient eth0