DHCP on Aliase eth0

[Oluwagbenga Shobowale]

Thanks ...
In my own case I had one network on the 192.168.1.0/24 subnet however a
friend needed to use our infrastructure hence I needed to set up another ip
range 192.168.4.0/24  since I wanted them to share my internet. Hence I
created an aliase on the eth0 which my network is on but when I configure
dhcp ... 
Below is my config
DHCPDARGS="eth0:0";
# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.

subnet 192.168.1.0 netmask 255.255.255.0 {
}

# This is a very basic subnet declaration.
subnet 192.168.4.0 netmask 255.255.255.0 {
     pool {
       range 192.168.4.20 192.168.4.252;
       option routers 192.168.4.2;    # NAT interface
       default-lease-time 900;
       max-lease-time 7200;
            }
   }




Virtual Interface 

DEVICE=eth0:0
HWADDR=00:1f:29:e0:70:ce
ONBOOT=yes
BOOTPROTO=none
IPADDR=192.168.4.2
USERCTL=no
PEERDNS=yes
IPV6INIT=no
NM_CONTROLLED=no
TYPE=Ethernet
NETMASK=255.255.255.0


Not sure what I am doing wrong ...



-----Original Message-----
From: redhat-sysadmin-list-bounces at redhat.com
[mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Peter Ruprecht
Sent: Thursday, September 03, 2009 6:21 PM
To: redhat-sysadmin-list at redhat.com
Subject: Re: DHCP on Aliase eth0

Oluwagbenga Shobowale wrote:
> Hello All,
> I need to know if it is possible to run dhcp server on an aliase
> interface eth0:0 ?
> 
> I have configured a dhcp server for a network that should be on this
> interface but I can't get it to work.
> Anyone worked on something like this?
> 

Maybe this will help.  Here's part of my dhcpd.conf file showing a pool 
that gives out addresses on an overlaid private network:

   # private subnet / trusted devices
   subnet 192.168.107.0 netmask 255.255.255.0 {
     pool {
       range 192.168.107.20 192.168.107.252;
       option routers 192.168.107.1;    # NAT interface
       allow members of "trustednat";
       default-lease-time 900;
       max-lease-time 900;
       authoritative;
     }
   }


Then I configure a virtual network interface for that network, in 
/etc/sysconfig/network-scripts/ifcfg-eth0:192 :

DEVICE=eth0:192
BOOTPROTO=none
BROADCAST=192.168.107.255
IPADDR=192.168.107.254
NETMASK=255.255.255.0
NETWORK=192.168.107.0
TYPE=Ethernet
USERCTL=no
HWADDR=00:15:17:85:7b:ab
ONBOOT=yes

If the alias interface is up when dhcpd starts, everything just seems to 
work.  Can you give more details on how your setup is not working?

Peter Ruprecht

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