[Dnsmasq-discuss] Repeated assignment, ignored dhcp-host, and failed DNS lookup

[Simon Kelley]

On 08/10/12 16:43, Lovelady, Dennis E. wrote:

> To summarize:
> 
> nslookup does not return IP address of DHCP-based servers
> 
> “dhcp-host” entries in /etc/dnsmasq.conf are ignored, or at least are
> not as expected
> 
> Repeated assignment of IP address to two interfaces
> 
>  
> 
> Following are the messages from dnsmasq since time of boot.  What might
> I be missing?
> 

The log is expected, and not necessarily a problem. The DHCPINFORM
transaction is the host asking for configuration information, which
dnsmasq supplies in the DHCPACK. It's possible for dnsmasq to reply to
DHCPINFORM messages even if a host doesn't actually have a DHCP lease
with it.


Questions:

Are there leases for .0.14 and .0.15 in the dnsmasq leases file?

Is there any way to get logs going further back?

Is there any chance that a rogue DHCP server has turned up on your network?

Has the host in question been attached to another network where it could
have picked up a different DHCP lease?

My guess is that the .14 and .15 leases don't exist in dnsmasq and the
host has picked them up elsewhere.

by now, the DHCP leases on .0.14 and .0.15 may have expired, and the
host will fail to renew them and cycle through the DHCP process, getting
the correct addresses. If not then taking the interfaces down and then
back up, or rebooting the host, should do that.


Cheers,

Simon.