I am running Fedora Core 6 on a Pentium IV system. I recently performed a yum update.

After rebooting the system, I can no longer access any network resources whether they are on my local net or the Internet.

When I try to ping a local system I get a response saying the network is unreachable.

If I try to ping something on the Internet I get a response saying the host is unkown.

What steps can I take toward troubleshooting and resolving this problem?

can you show us the output of "/sbin/ifconfig" and "/sbin/route -n". is the network even started? what kind of network cards are you using?

ifconfig -a results in:
eth0 Link encap:Ethernet HWaddr 00:02:E3:15:64:F6
inet6 addr: fe80::202:e3ff:fe15:64f6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1015 errors:0 dropped:0 overruns:0 frame:0
TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:182050 (177.7 KiB) TX bytes:6215 (6.0 KiB)
Interrupt:18 Base address:0xe000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3051 errors:0 dropped:0 overruns:0 frame:0
TX packets:3051 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4616958 (4.4 MiB) TX bytes:4616958 (4.4 MiB)

route -n results in:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

I've had the system for a long time so its hard to remember what the network adapter is. I believe it is a Netgear card.

eth0 has no ipv4 ip address... that certianly comes in handy. check /etc/sysconfig/network-scripts/ifcfg-eth0 for an ip address entry or run system-config-network again.

Here is what is in my ifcfg-eth0 file:

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet


When I try to run system-config-network from a terminal session in X windows, I get the following error output:
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

ERROR: Unable to initialize graphical environment. Most likely cause of failure is that the tool was not run using a graphical environment. Please either start your graphical user interface or set your DISPLAY variable.

looks like there's no DHCP server nearby... is there?

you can't run pass as root in a non-root owned xsession by default. as your normal user run "xhost +localhost" and then try again.

I'm not sure I understand what you are saying. I have other machines on my local network that can access the Internet just fine. I don't know what this says about any DHCP server. I don't know if a DHCP server is supposed to be running on my Fedora system or not. I've never done anything to enable such a server on any of my systems.

I had tried launching system-config-network using sudo. I just tried su - instead and was able to succefully launch the network configuration interface.

I'm not sure what I'm supposed to do. The application says that the network device is active. When I try to activate it an error message displays saying it is already running.

your interface is clearly set to use DHCP. do you now even know if you have a DHCP server running somewhere on your LAN? normally it's on an ADSL router...

I do not know if I have a DHCP server running. I have a Linksys cable/dsl router that serves the three system I have on my network. How I determine my DHCP status?

I've been using Fedora Linux for quit a while on my home network. It is only recently that I have been having this problem. I have not made any changes to the router or anything else network related for a long time, so I don't know why the network configuration would suddenly be a problem.