On Mon 10/17/2005 7:37 PM Paul Kaplan wrote: > I'm running a new 2006 installation on a Thinkpad T40, but I'm having network > connection problems that never appeared on a previous 10.1 installation on > the same hardware. > > The network connection appears to be dropped every few minutes (can't ping > anything). The only way to re-establish is to use the network config wizard > in the control center to create a new connection; ifconfig eth0 up doesn't do > the trick > > Any suggestions as to how to trouble shoot this problem? Where to begin? > What to look for?
I am not running `06 (I'm on 10.1), but I have have very bad experiences with the network conifg GUI. I have experienced exactly what you're describing when I have used the GUI. I much perfer to set everything up by hand. There are only 3 files to edit: Edit /etc/sysconfig/network-scripts/ifcfg-eth0 It should read: (you can leave out anything on a line after #) DEVICE=eth0 BOOTPROTO=static IPADDR=192.168.1.2 # or whatever your IP address is to be NETMASK=255.255.255.0 # or 255.0.0.0 if your IP address is 10.x.x.x NETWORK=192.168.1.0 # or 10.0.0.0 if your IP address is 10.x.x.x or 192.168.2.0 if your IP address is 192.168.2.x BROADCAST=192.168.1.255 # or 10.255.255.255 if your IP address is 10.x.x.x or 192.168.2.255 if your IP address is 192.168.2.x ONBOOT=yes MII_NOT_SUPPORTED=yes Edit /etc/resolv.conf It should contain the nameserver address(es) - put the address of your ISPs nameserver right at the top. eg: nameserver 195.20.224.165 Edit /etc/sysconfig/network The default gateway and your hostname go here: HOSTNAME=yourhostname_goes_here NETWORKING=yes GATEWAY=192.168.1.1 # the IP address of your default gateway GATEWAYDEV=eth0 In a terminal, type: iptables -t nat -D PREROUTING -i eth0 -j loc_dnat You may get an error with this - don't worry - if you do, just skip the next line: Add the above line to the bottom of /etc/rc.d/rc.local. This will bypass a proxy server Mdk will have set up if you ran the wizard. Then type ifup eth0 - this should bring up the network Then try it all out: Try pinging your computers NIC If you get errors, then your NIC is not working. If OK - Try pinging the gateway If OK - Try browsing - if you cannot reach say, www.google.com, try typing http://216.239.57.99/ (IP address of google) into your browser address bar. If you cannot reach a site by name, but can get it by IP address, you have a DNS problem. If OK, Check to make sure it all works across a reboot. HTH, -larry
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