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Servers & Networking Discuss any Fedora server problems and Networking issues such as dhcp, IP numbers, wlan, modems, etc.

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  #1  
Old 16th April 2007, 04:41 PM
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Domain names fail to resolve, but IP addresses ok

Hello Everyone:

I am having trouble on my FC3 system. After a recent reboot, my system begin to fail to connect any server when using the domain name of the server. This occurs using ssh, ping, ftp, http, etc. The issue is isolated to domain name resolution only. If I use the IP address of the server, I am able to connect without issue. I would greatly appreciate any help with this issue. Please let me know if you need further information to help with this issue.
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Old 16th April 2007, 05:09 PM
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Welcome to the forum, have you checked the IP address settings and that the current IP address of your DNS server is reachable from that machine? If so and it still doesn't work, maybe you could post the output of this command:
Quote:
/sbin/ifconfig
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Old 16th April 2007, 05:14 PM
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I would also think that you may want to look at the "/etc/resolve.conf" file. If it does not have anything in there open the file in a text editor and type in

nameserver (IP of DNS Server)

that should get you going
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Old 16th April 2007, 05:27 PM
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Thanks for the help wdgiles and tech matt:

Here is the output from /sbin/ifconfig:

eth0 Link encap:Ethernet HWaddr 00:30:48:75:0A:88
inet addr:192.168.0.254 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::230:48ff:fe75:a88/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:130827982 errors:0 dropped:0 overruns:0 frame:0
TX packets:97529719 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:88746230 (84.6 MiB) TX bytes:1858996356 (1.7 GiB)
Interrupt:169

eth1 Link encap:Ethernet HWaddr 00:30:48:75:0A:89
inet addr:10.30.5.28 Bcast:10.30.5.255 Mask:255.255.255.0
inet6 addr: fe80::230:48ff:fe75:a89/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9471955 errors:0 dropped:0 overruns:0 frame:0
TX packets:7396995 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2956622411 (2.7 GiB) TX bytes:3488745635 (3.2 GiB)
Interrupt:169

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:25818605 errors:0 dropped:0 overruns:0 frame:0
TX packets:25818605 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2351250350 (2.1 GiB) TX bytes:2351250350 (2.1 GiB)


As for the resolve.conf file, it contains the following:

nameserver 127.0.0.1
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Old 16th April 2007, 05:42 PM
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If you check the System / Administration / Network control panel, it appears that you are running two NIC's on your system. Double click the Eth0 device and on the general tab, enter "eth1" as the default gateway address. Restart the network connections. that should resolve it.
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Old 16th April 2007, 05:52 PM
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Hello wdgiles. Sorry, I should have mentioned earlier, this is the master node of a cluster. I need both NICs running for this setup. Eth0 for to communicate with the nodes and Eth1 to communicate with the outside world. I am having no trouble communicating with the nodes.
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Old 16th April 2007, 06:09 PM
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it still sounds like a DNS problem - either you need to make changes to your default dns servers in resolv.conf or you need to set up a bind dns server on your machine. Let us know if you need more help.
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  #8  
Old 16th April 2007, 06:13 PM
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Is this system running a DNS if not then you need to put the DNS address in the resolve.conf file instead of the 127.0.0.1

If it is then you my want to make sure the DNS is running

"service named start"
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Old 16th April 2007, 06:14 PM
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I will give it a shot! Thanks everyone for all the help!
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