[CentOS] DHCP Messages

Jean Figarella jfigarella at vecna.com
Tue Mar 6 13:13:37 UTC 2007


Daniel Senie wrote:
> At 10:26 AM 2/22/2007, you wrote:
> 
>> Daniel Senie wrote:
>>> At 09:42 AM 2/22/2007, Jean Figarella wrote:
>>>
>>>> Hi, Im getting this messages in the /var/log/messages about my dhcp 
>>>> server. I assume there is nothing to worry about, but just in case I 
>>>> have to ask. Are these messages fine? Do I need to specify the 
>>>> interface on which the dhcp server should listen to?
>>>>
>>>> ...
>>>> dhcpd: Multiple interfaces match the same subnet: eth0 eth1
>>>> dhcpd: Multiple interfaces match the same shared network: eth0 eth1
>>>> LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
>>>>
>>>> dhcpd: Multiple interfaces match the same subnet: eth0 eth1
>>>> dhcpd: Sending on   LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
>>>> dhcpd: Multiple interfaces match the same shared network: eth0 eth1
>>>> dhcpd: Listening on LPF/eth0/00:a0:d1:e2:f5:1e/192.168.3/24
>>>> ....
>>> What's ifconfig report for the IP addresses and subnet masks of your 
>>> multiple interfaces? And are these interfaces in fact cabled to the 
>>> same switch/hub?
>>>
>>>
>>>> Thanks
>>>> Jean
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>>
>>
>>
>>
>> Yes, the two interfaces are configured to be int he same network using 
>> the same switch and everything; only because this server is replacing 
>> an old server. I guess if this is not an "OK" design I can just move 
>> the dhcp to a new server, since that this would be so easy to do.
> 
> You might want to use aliaing, so that eth0 is the base address and 
> eth0:0 is the IP address of the old server you've pulled out of service. 
> That way your new server will respond to both addresses, but without the 
> issues that arise with two interfaces on the same subnet. The DHCP 
> server will operate without complaint in the presence of additional IP 
> addresses on a single interface.
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Problem solved. Using ip aliases.

Thanks



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