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Old 09-10-2004, 12:21 PM   #1
okie90210
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Registered: Mar 2004
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Linux dns problem with comcast


I have two linux boxes and a windows 2k box connected to a motorola sb5100 cable modem via a linksys wrt54g router. Up until yesterday all the systems connected to the internet fine. Yesterday, the linux boxes stopped working with the comcast dns servers. I connect via DHCP. I have the exact same dns servers listed on all the boxes. The win 2k machine still works fine. I can reach ip numbers on the linux boxes but not the web names. I have tried to get comcast to help but they won't talk to you when you say linux and never let you talk to anyone who could actually help! My two linux boxes are running the following OSs: Knoppix 3.4 and Suse 8.0. The Suse box confirms on boot up that the personal firewall is not on. I can ping the comcast dns servers as well as my router and other outside ips!
Is there something I am missing here? I have tried the power off and cycle of all the components involved. Is there something comcast could have done to their dns servers to mess up my ability to resolve addresses?
I am at wits end as what to try next! Help!
 
Old 09-10-2004, 11:04 PM   #2
win32sux
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Registered: Jul 2003
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a few questions:

the linux boxes get their ip configuration from a dhcp daemon on the linksys router, right??

are you 100% sure that the dns server addreses that the windows box is using are the same ones that appear in your /etc/resolv.conf files??

they should be the same, as they are obtained from the dhcp server... the dhcp daemon on the linksys gives the machines on the lan the ip of the ISPs dns servers, right??
 
Old 09-11-2004, 09:41 AM   #3
okie90210
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Registered: Mar 2004
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>the linux boxes get their ip configuration from a dhcp daemon on the linksys router, right??

Yes

>are you 100% sure that the dns server addreses that the windows box is using are the same ones that appear in your /etc/resolv.conf files??

Yep, I'm 100% sure. The resolv.conf entries are exactly the same as the windoze machine. This by far is the most puzzling part of the problem for me!

>they should be the same, as they are obtained from the dhcp server... the dhcp daemon on the linksys gives the machines on the lan the ip of the ISPs dns servers, right?

Yes. I will focus in on the router to see if it is the problem and post my progress in a few...
I didn't think of this line of investigation... thanks. I will post again with my progress.
 
Old 09-11-2004, 09:49 AM   #4
okie90210
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win32sux,

Thank you for your help! It was indeed the linksys router. Although I had released the dns info and renewed it in the router prior to posting this.... I discovered what happened. The router was set to obtain dhcp, however there were some old static dns entries in the table even though dhcp was checked. When I changed these to 0.0.0.0 and released the dns entries and renewed... I got new dns entries! I fired up Mozilla on the linux boxes and sure enough everything is working!!! Yippee!!!
Thanks a million.... I hope this will help other people... make sure that any static dns entries are removed because the dhcp check box does not override them!!!
 
  


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