[CentOS] CentOs 6 DHCP Server and virtual interface

[Johnny Hughes]

On 02/03/2013 07:38 AM, Grzegorz Sołtys wrote:
> I have made it, and the DHCP server won't start telling me:
>
> " Feb  3 13:42:21 vlan19 dhcpd: No subnet declaration for eth0:0 (no
> IPv4 addresse s).
> Feb  3 13:42:21 vlan19 dhcpd: ** Ignoring requests on eth0:0.  If this
> is not what
> Feb  3 13:42:21 vlan19 dhcpd:    you want, please write a subnet
> declaration
> Feb  3 13:42:21 vlan19 dhcpd:    in your dhcpd.conf file for the
> network segment
> Feb  3 13:42:21 vlan19 dhcpd:    to which interface eth0:0 is
> attached. **
> "
>
> I have conifgured all files to use DHCPD on this interface.  Do you
> need all conifguraiton?

Inside your dhcpd.conf file you need a subnet declaration and the IP
Address of ETH0:0 has to be in that subnet.

See:

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/sect-Configuring_a_Multihomed_DHCP_Server.html


So, for example, if I have:

subnet 192.168.0.16 mask 255.255.255.240 {
option <whatever>
option <whatever2>
}

Then eth0:0 would have to be inside the IP Range of the subnet ... in
this case, 192.168.0.16/255.255.255.240 is the IP addresses from
192.168.0.16 through 192.168.0.31 (with 16 and 31 being not usable as
they are the network name and the broadcast address).  This would mean
that eth0:0's IP address would need to be somewhere in the range of
192.168.0.17 and 192.168.0.30 to serve that subnet.

>
> W dniu 2013-02-03 14:28, Johnny Hughes pisze:
>> On 02/03/2013 06:38 AM, Grzegorz Sołtys wrote:
>>> Hello All
>>>
>>> I have looking for any specific answer for one thing.
>>>
>>> I have a virtualized Server with only one physical interface eth0
>>> (WAN).
>>> To run OpenVPN i need to use DHCP server. And here is the question: is
>>> there a chance to run DHCP server on eth0:0 interface? Or it is
>>> impossible ?
>>>
>>> Thanks in advance.
>>>
>>  From the EL6 Deployemtn Guide:
>> https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/sect-Configuring_a_Multihomed_DHCP_Server.html
>>
>>
>>
>> "If a system has three network interfaces cards -- eth0, eth1, and eth2
>> -- and it is only desired that the DHCP daemon listens on eth0, then
>> only specify eth0 in /etc/sysconfig/dhcpd"
>> DHCPDARGS="eth0"
>>
>> So in your case, edit the file /etc/sysconfig/dhcpd and set:
>>
>> DHCPDARGS="eth0:0";
>>
>>
>>
>>
>>
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>
>


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