Make a DHCP server using Fedora - Help

[Les Mikesell]

Antonio Olivares wrote:
>
> BTW,
> 
> I am getting DHCP requests from other machines in the school network :(
> I only want the network for my own machines in the classroom not the others.  Here's what I am getting 
> 
> Nov 19 07:14:27 localhost dhcpd: DHCPDISCOVER from 00:50:2c:a2:23:28 via eth0: network 10.154.19.0/24: no free leases                                           
> Nov 19 07:14:27 localhost dhcpd: DHCPREQUEST for 10.154.19.248 (10.154.16.130) from 00:50:2c:a2:23:28 via eth0: unknown lease 10.154.19.248.                    
> Nov 19 07:18:50 localhost ntpd[2082]: synchronized to 72.249.76.84, stratum 2   
> Nov 19 07:24:25 localhost dhcpd: DHCPREQUEST for 10.154.19.94 from 00:40:f4:ea:ee:d3 via eth0: unknown lease 10.154.19.94.                                      
> Nov 19 07:25:34 localhost dhcpd: DHCPINFORM from 10.154.19.94 via eth0          
> Nov 19 07:25:34 localhost dhcpd: DHCPACK to 10.154.19.94 (00:40:f4:ea:ee:d3) via eth0                                                                           
> Nov 19 07:25:37 localhost dhcpd: DHCPINFORM from 10.154.19.94 via eth0          
> Nov 19 07:25:37 localhost dhcpd: DHCPACK to 10.154.19.94 (00:40:f4:ea:ee:d3) via eth0                                                                           
> Nov 19 07:26:51 localhost dhcpd: DHCPREQUEST for 10.154.19.133 from 00:0c:f1:76:fc:68 via eth0: unknown lease 10.154.19.133.                                    
> Nov 19 07:27:25 localhost dhcpd: DHCPINFORM from 10.154.19.165 via eth0         
> Nov 19 07:27:25 localhost dhcpd: DHCPACK to 10.154.19.165 (00:08:74:2e:70:e7) via eth0                                                                          
> Nov 19 07:27:28 localhost dhcpd: DHCPINFORM from 10.154.19.165 via eth0         
> Nov 19 07:27:28 localhost dhcpd: DHCPACK to 10.154.19.165 (00:08:74:2e:70:e7) via eth0                                                                          
> Nov 19 07:30:08 localhost dhcpd: DHCPINFORM from 10.154.19.63 via eth0
> Nov 19 07:30:08 localhost dhcpd: DHCPACK to 10.154.19.63 (00:12:3f:31:8d:b4) via eth0
> Nov 19 07:30:11 localhost dhcpd: DHCPINFORM from 10.154.19.63 via eth0
> Nov 19 07:30:11 localhost dhcpd: DHCPACK to 10.154.19.63 (00:12:3f:31:8d:b4) via eth0
> Nov 19 07:32:38 localhost dhcpd: DHCPINFORM from 10.154.19.133 via eth0
> Nov 19 07:32:38 localhost dhcpd: DHCPACK to 10.154.19.133 (00:0c:f1:76:fc:68) via eth0
> Nov 19 07:33:57 localhost dhcpd: DHCPDISCOVER from 00:08:a1:0f:53:35 via eth0: network 10.154.19.0/24: no free leases
> Nov 19 07:33:57 localhost dhcpd: DHCPREQUEST for 10.154.19.91 (10.154.16.130) from 00:08:a1:0f:53:35 via eth0: unknown lease 10.154.19.91.
> Nov 19 07:34:13 localhost dhcpd: DHCPINFORM from 10.154.19.91 via eth0
> Nov 19 07:34:13 localhost dhcpd: DHCPACK to 10.154.19.91 (00:08:a1:0f:53:35) via eth0
> Nov 19 07:34:16 localhost dhcpd: DHCPINFORM from 10.154.19.91 via eth0
> Nov 19 07:34:16 localhost dhcpd: DHCPACK to 10.154.19.91 (00:08:a1:0f:53:35) via eth0
> 
> Thank you very much again for helping out.  
> 

Your client subnet should be physically isolated from rest of the 
building's network.  That is, the host should have one interface on the 
main net and another connected to a separate switch where your dhcp 
clients connect.  You will break the rest of the main network if you 
connect your dhcp-serving interface there.

-- 
   Les Mikesell
    lesmikesell at gmail.com