[CentOS] Centos 7 dhcpd failure to allow a 2nd network over same interal nic
John R Pierce
pierce at hogranch.com
Mon Jan 16 09:42:52 UTC 2017
On 1/16/2017 1:29 AM, Rob Kampen wrote:
> 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.
you can't mix subnets like that. it just won't work. the local
broadcast address for the /24 isn't in either of your /28's, and what do
the two /28's use for their default gateway ?
--
john r pierce, recycling bits in santa cruz
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