how to debug dhcp?

[dragoran]

dragoran wrote:
> dragoran wrote:
>> John Reiser wrote:
>>>> when I try to use dhcp for my network device (eth0 - forcedeth) it 
>>>> does
>>>> not get an IP with the result: failed
>>>>     
>>>
>>>  
>>>> 2) how can I debug it to find out what is causing it?
>>>>     
>>>
>>> Boot single-user, invoke the dhcp program from a console in 
>>> "non-daemon"
>>> mode, and watch.
>> how do I do this (found nothing in the man page)
>>>   For dhcpd, consider flags -d -tf and perhaps -play.
>>> Also, consider running under strace.
>> I am talking about dhclient not dhcpd
>>>   For lowest-level packet trouble,
>>> use a program such as tcpdump or ethereal to check what goes over 
>>> the wire.
>>>
>>>   
>> used ethreal an have not found anything that looks like an error...
>>
>
> this is what I get in /var/log/messages:
> Jul 19 09:08:39 chello062178124144 dhclient: DHCPDISCOVER on eth0 to 
> 255.255.255.255 port 67 interval 6
> Jul 19 09:08:45 chello062178124144 dhclient: DHCPDISCOVER on eth0 to 
> 255.255.255.255 port 67 interval 9
> Jul 19 09:08:54 chello062178124144 dhclient: DHCPDISCOVER on eth0 to 
> 255.255.255.255 port 67 interval 10
> Jul 19 09:09:04 chello062178124144 dhclient: DHCPDISCOVER on eth0 to 
> 255.255.255.255 port 67 interval 12
> Jul 19 09:09:16 chello062178124144 dhclient: DHCPDISCOVER on eth0 to 
> 255.255.255.255 port 67 interval 19
> Jul 19 09:09:35 chello062178124144 dhclient: DHCPDISCOVER on eth0 to 
> 255.255.255.255 port 67 interval 5
> Jul 19 09:09:40 chello062178124144 dhclient: No DHCPOFFERS received.
>
> wtf?
> who is broken here? should I fill a bug?
>
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=199687
(ethreal capture included)