Redhat NTPD Clock (Bob, you may have the problem)

John Wirt j.wirt.112 at comcast.net
Sat May 27 19:34:51 UTC 2006



John Wirt wrote:

Problem fixed. I figured out how to open the network interface 
configuration editor. Turning DHCP on fixed the clock.redhat.com problem.

Thanks.

John

>
> Bob McClure Jr wrote:
>
>> On Fri, May 26, 2006 at 10:30:50PM -0400, John Wirt wrote:
>>  
>>
>>> Bob McClure Jr wrote:
>>>
>>>   
>>>
>>>> On Fri, May 26, 2006 at 08:27:16AM -0400, John Wirt wrote:
>>>>
>>>>     
>>>>
>>>>> John Wirt wrote:
>>>>>
>>>>>       
>>>>>
>>>>>> Bob McClure Jr wrote:
>>>>>>
>>>>>>         
>>>>>>
>>>>>>> On Thu, May 25, 2006 at 09:26:57PM -0400, John Wirt wrote:
>>>>>>>
>>>>>>>           
>>>>>>>
>>>>>>>> Hmm..can you  tell me how to set the security level?
>>>>>>>>
>>>>>>>> Thank you, Rick.
>>>>>>>>
>>>>>>>> John Wirt
>>>>>>>>
>>>>>>>>             
>>>>>>>
>>>>>>> We prefer bottom posting here.  See
>>>>>>>
>>>>>>> http://en.wikipedia.org/wiki/Top-posting
>>>>>>>
>>>>>>> Try "firewall-config".
>>>>>>>
>>>>>>>           
>>>>>>
>>>>>> When I enter "firewall-config" as a command, the response is 
>>>>>> "command not found"
>>>>>>
>>>>>> When I enter "iptables -h" as a command. the response is "command 
>>>>>> not found"
>>>>>>
>>>>>> What should I do?
>>>>>>
>>>>>> John Wirt
>>>>>>   
>>>>>>         
>>>>>
>>>>> PS, also I have no Internet access the desktop.
>>>>>  
>>>>>
>>>>>       
>>>>
>>>> Not sure what you mean by that.  Post the results of "netstat -rn".
>>>> You can do that as your mere mortal self.
>>>>
>>>>
>>>>
>>>>     
>>>
>>> Here are the results of netstat -rn:
>>>
>>> Destination   Gateway        Genmask          Flags   MSS  WIndow 
>>> irtt  iface
>>> 192.168.10.0  0.0.0.0        255.255.255.0    U         0  0         
>>> 0  eth0
>>> 169.254.0.0   0.0.0.0        255.255.0.0      U         0  0         
>>> 0  eth0
>>> 0.0.0.0       192.168.10.100 0.0.0.0          UG        0  0         
>>> 0  eth0
>>>
>>> I tried sending this information by email to the computer that I am 
>>> sending this from. The email apparently left my Linux machine  but 
>>> never arrived at the other one. I am currently using the KDE desktop 
>>> on the Linux machine.  Evolution email does not work.
>>>
>>> 192.168.10.0 is the IP address of my local LAN. I have a cable modem 
>>> connected to a Linksys router, which has four LAN ports.
>>>   
>>
>>
>> Is its gateway address 192.168.10.100?  That seems a bit unusual.
>>  
>>
> You may be onto something here. Originally, I used NAT to access the 
> Internet through another machine. The NAT gateway was 192.168.10.100. 
> and  all machines had fixed addressing (including my Linux machine). 
> Recently, I switched to using a cable modem and router to form the 
> local LAN. This LAN is set up using all DHCP.   Probably, I need to 
> change the network configuration on my Linux machine to turn on DHCP.
>
> I tried all the network configuration applications on the KDE desktop 
> (Network Devices, etc.) but none allow designation of fixed v. DHCP 
> addressing, or I could find anything.
>
> How can I configure eth0 on my Linux machine?
>
>> Are all the machines on static IP addresses or on DHCP?
>>  
>>
>> How does one machine find another by name, i.e. are you using a local
>> DNS or does the router do DNS for the internal network?
>>
>>  
>>
> DNS comes from Comcast. I know Comcast's DNS addresses.  The router 
> must do the DNS. DNS is on auto for all my other machines and they 
> work fine to the Internet.
>
> John Wirt
>
>>> If I ping 169..254.0.0, the reply times out.
>>>   
>>
>>
>> Ignore that.
>>
>>  
>>
>>> John Wirt
>>>
>>>
>>> John Wirt
>>>
>>>
>>>   
>>>
>>>>> No errors other than the clock.redhat.com error is reported on 
>>>>> boot up.
>>>>>
>>>>> - - - - - - - - - - - - - - - - - -
>>>>>
>>>>>       
>>>>>
>>>>>>>> Rick Stevens wrote:
>>>>>>>>
>>>>>>>>             
>>>>>>>>
>>>>>>>>> On Thu, 2006-05-25 at 00:58 -0400, John Wirt wrote:
>>>>>>>>>
>>>>>>>>>               
>>>>>>>>>
>>>>>>>>>> Thanks you several of you, I have RedHat booting to 
>>>>>>>>>> completion just fine except for one problem.
>>>>>>>>>>
>>>>>>>>>> Near the end of the boot sequence, RedHat apparently tries to 
>>>>>>>>>> connect to some time standard at 66.187.224.4. The sequence is:
>>>>>>>>>>
>>>>>>>>>> ntpd: Opening firewall for input from 66.187.224.4 port 123
>>>>>>>>>> ntpd: Opening firewall for input from clock.redhat.com port 123
>>>>>>>>>> iptables v 1.2.8: host/network clock.redhat.com not found 
>>>>>>>>>> [FAILED]
>>>>>>>>>>
>>>>>>>>>> use iptables -h for assistance.
>>>>>>>>>>
>>>>>>>>>> However, iptables -h doesn't provide any help.
>>>>>>>>>>
>>>>>>>>>> What is the problem? How can I fix it?
>>>>>>>>>>
>>>>>>>>>>                 
>>>>>>>>>
>>>>>>>>> You must have the firewall open ports for TCP and UDP port 53 
>>>>>>>>> (DNS).
>>>>>>>>> What's probably happening is that the system is trying to resolve
>>>>>>>>> clock.redhat.com (66.187.224.4 and 66.187.233.4) and can't 
>>>>>>>>> because the
>>>>>>>>> firewall is blocking DNS issues.  This happens if you used the 
>>>>>>>>> "maximum"
>>>>>>>>> setting on system-config-securitylevel as that blocks EVERYTHING
>>>>>>>>> (including DNS).  Use the "medium" security setting.
>>>>>>>>>
>>>>>>>>> ---------------------------------------------------------------------- 
>>>>>>>>>
>>>>>>>>> - Rick Stevens, Senior Systems Engineer     
>>>>>>>>> rstevens at vitalstream.com -
>>>>>>>>> - VitalStream, Inc.                       
>>>>>>>>> http://www.vitalstream.com -
>>>>>>>>> -                                                                    
>>>>>>>>> -
>>>>>>>>> -        Change is inevitable, except from a vending 
>>>>>>>>> machine.        -
>>>>>>>>> ---------------------------------------------------------------------- 
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>               
>>>>>>>>
>>>>>>> Cheers,
>>>>>>>
>>>>>>>           
>>>>>>
>>>> Cheers,
>>>>     
>>>
>>
>> Cheers,
>>  
>>
>
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