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Simone Caldana 08-11-2010 06:31 PM

DHCP problem with virtual interfaces
 
John,
thanks for the feedback.

Il giorno 11/ago/2010, alle ore 19.46, JohnS ha scritto:
> That was my solution to use static IPs. on the Linux Machines only. You
> do not see this under Windows.

this reinforces my idea this is a dhclient bug rather than dhcpd's.

>> Attached a txt with the tcpdump of the above log extraction.
>
> That dump is not long enough to tell anything funny going on.

I know. I reported it to pair it with the the above messages log. It doesn't seem to me these packets contain the dhcp-client-identifier..

I am collecting port 67 traffic on the dhcp server since this afternoon. I hope to be able to find out more.

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Simone Caldana 08-12-2010 08:51 AM

DHCP problem with virtual interfaces
 
Il giorno 11/ago/2010, alle ore 20.31, Simone Caldana ha scritto:
>
> I am collecting port 67 traffic on the dhcp server since this afternoon. I hope to be able to find out more.

further testing revealed that dhclient really asks for the wrong ip (but always sends the client-identifier), and this is due to the poisoned leases file. I am now using /dev/null as leases file for all the virtual dhclients, but I wonder if this disables the entire "keep the old lease" system (which I don't really need) or it simply stays only in memory, which won't really solve the problem.


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Simone Caldana 08-13-2010 09:25 AM

DHCP problem with virtual interfaces
 
Il giorno 12/ago/2010, alle ore 10.51, Simone Caldana ha scritto:

> Il giorno 11/ago/2010, alle ore 20.31, Simone Caldana ha scritto:
>>
>> I am collecting port 67 traffic on the dhcp server since this afternoon. I hope to be able to find out more.
>
> further testing revealed that dhclient really asks for the wrong ip (but always sends the client-identifier), and this is due to the poisoned leases file. I am now using /dev/null as leases file for all the virtual dhclients, but I wonder if this disables the entire "keep the old lease" system (which I don't really need) or it simply stays only in memory, which won't really solve the problem.

bug has been filed, patch has been proposed:
https://bugzilla.redhat.com/show_bug.cgi?id=623953

Jeremiah Jinno discovered the problem and proposed a patch upstream to ISC:

https://lists.isc.org/mailman/htdig/dhcp-users/2010-June/011521.html

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