Lost all network connectivity after clean FC3 install

[Paul Howarth]

Salvatore Indiogine wrote:
> Hi Jay!
> 
> Thanks to your help I am making progress on my
> networking problems.
> 
> 1. Now I have internet connectivity by adding the GW
> to the eth0-DHCP configuration.
> 
> 2. Now I also can bring up the LAN side on eth1 by
> removing the GW from the settings and using
> 192.168.0.1 ip address and 255.255.255.0 mask.
> 
> 3. I have a Fedora PC connected to eth1 using a
> crossover cable. Before I had internet connectivity
> with the following settings on the client PC (adjusted
> for new network schema):
> 
> IP: 192.168.0.50
> Mask: 255.255.255.0
> GW: 192.168.0.1 (= eth1 on PC connected to cable
> modem)
> 
> DNS: same entries as on PC connected to cable modem.
> 
> Then I adjust /proc/sys/net/ipv4/ip_forward and also
> modify /etc/sysctl.conf so that I do not have to echo
> to proc after each reboot.
> 
> Then I type (as root) on the PC connected to the cable
> modem:
> 
> iptables --table nat --append POSTROUTING
> --out-interface eth0 -j MASQUERADE
> iptables --append FORWARD --in-interface eth1 -j
> ACCEPT
> 
> So, when I still was at FC1 it worked like a charm. 
> Now as FC3 the following happens at the client PC
> (192.168.0.50):
> 
> 1. ping 192.168.0.1, OK works!
> 2. ping the IP number of either of the DNS servers, OK
> works!
> 3. ping the charter.net GW, OK works!
> 4. ping a non-IP, thus requiring DNS name resolution
> e.g. ping www.cnn.com, the I get:
> 
> www.cnn.com unknown host.  So for some reason I do not
> get DNS to resolve host names even though everything
> else now works. 
> 
> /etc/resolv.conf is the same now on 192.168.0.1 and
> 192.168.0.2

What is the "hosts" entry in /etc/nsswitch.conf on the client PC?

Try the "dig" tool to diagnose DNS problems on the client (part of the 
bind-utils package):

$ dig @68.112.12.36 www.cnn.com

Does this work?

Paul.