Hi, I'm fairly new to linux, but have been running FC4 successfully for a while. I have been running updates using yum update, and suddenly have found my internet connection has stopped working. The ADSL modem is still showing a green light for a good ethernet connection. On booting it returns ok for the "Determining IP information for eth0 ...", but fails on ntpd: synchronising with time server" Can anyone help

Does your machine indeed obtain a DHCP lease? If so, are you sure that the time server to which you are trying to synchronize, is available? Can you resolve any domain names? Can you ping any external addresses? In short, does your Internet connection work otherwise? If not, have you recently installed a firewall or made any changes to an existing firewall configuration? k_Rob - kk7av

I am not 100% sure how to check for a DHCP lease, but in the configure network settings for the ethernet connection, the DHCP settings is greyed out and I can only manually select a static IP address. It's not only the time server I cannot get to, I can't get any Internet connection. I haven't changed or installed a firewall, but I have just done a yum update and haven't been able to get back on the net since. I am doing this from another machine

Apparently you are using some front end to configure your network settings. You might want to manually edit the configuration file if the gui won't give you the options you need. Anyway, open a shell and type, "ifconfig" and it will list all the active interfaces along with their settings. Make sure that the interface in question, has a valid IP address for your network. If it doesn't, then you probably just need to reconfigure your network interface settings. If it does, then move on to the other steps I suggested. Firewall, perhaps? k_Rob - kk7av

Have you tried resetting the ADSL router? Check that your cables are still plugged in OK. What are the outputs of "/sbin/ifconfig", "/sbin/route", "/usr/sbin/iptables --list" and "cat /etc/resolv.conf"? (NB You have to be root to run the iptables command)

Hi, I've booted the machine using a knoppix CD and it connects fine, so all the hardware cables etc must be ok. I'm not sure how to check the firewall... Outputs.. /sbin/ifconfig eth0 Link encap:Ethernet HWaddr 00:10:A4:8E:DC:E3 inet addr:220.238.5.182 Bcast:220.238.5.182 Mask:255.255.255.255 inet6 addr: fe80::210:a4ff:fe8e:dce3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:23 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1780 (1.7 KiB) TX bytes:3429 (3.3 KiB) 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:2139 errors:0 dropped:0 overruns:0 frame:0 TX packets:2139 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2593664 (2.4 MiB) TX bytes:2593664 (2.4 MiB) /sbin/route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0 cat /etc/resolv.conf ; generated by /sbin/dhclient-script nameserver 198.142.0.51 nameserver 211.29.132.12 There doesn't seem to be a /usr/sbin/iptables file....

OK from the above I can see that it probably doesn't work. The output of ifconfig says that your IP is 220.238.5.182 with a netmask of 255.255.255.255 ie just one IP in the subnet. The output of route says that your default gateway is 169.254.0.0 which is not in your subnet. You may also want to check the IPs for your DNS servers which are listed in resolv.conf. A simple fix may be to assign a DHCP lease to your nic (eth0). Try: # ifconfig eth0 down # dhclient eth0 or # dhcpcd eth0 If that fixes it, post up the output from those commands again.