[CentOS] Centos 7 dhcpd failure to allow a 2nd network over same interal nic

On 16/01/17 21:54, John R Pierce wrote:
> On 1/16/2017 12:44 AM, Rob Kampen wrote:
>>>
>> Here's an idea - untested.
>> set up a network on the single nic - say 192.168.55.xx/24
>> set up the dhcp to offer leases from a subset of this network - say 
>> 192.168.55.128/28
>> set up fixed leases based upon mac address from the remainder of the 
>> network - i.e. outside the subset above - e.g. 192.168.55.1/28
>> then route / firewall as required - i.e. trusted known mac address 
>> hence IP address allowed vs unknown guest given an IP address we can 
>> block or otherwise handle.
>> As indicated, this is not tested but if memory serves, dhcpd will 
>> allow this kind of allocation. 
>
> the untrusted wireless users will be able to access other LAN machines 
> without going through the firewall.
>
surely that depends upon the subnet they operate on (i.e the subnet mask 
in old vernacular) - the two I show above are mutually exclusive but can 
both talk to the server.