DHCP on Aliase eth0

Thu Sep 3 18:48:17 UTC 2009

Totally wrong.

take a look at this:
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch08_:_Configuring_the_DHCP_Server#The_.2Fetc.2Fdhcpd.conf_File
See the section toward the bottom of the page titled:
 DHCP Servers with Multiple NICs
it might be what you are looking for.

Matt
________________________________________
From: redhat-sysadmin-list-bounces at redhat.com [redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Matt Brown (Sky Road LLC) [mbrown at skyroadasp.com]
Sent: Thursday, September 03, 2009 1:38 PM
To: redhat-sysadmin-list at redhat.com
Subject: RE: DHCP on Aliase eth0

I have not played with DNS in a while, but I think the eth0:0 interface has to be within the range of ips for DHCP.
try changing the range from .20 to .2 or the ip of the interface to .21.

Could be totally wrong though since the option routers line looks sane.

Matt
________________________________________
From: redhat-sysadmin-list-bounces at redhat.com [redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Oluwagbenga Shobowale [gshobowale at nextworksltd.com]
Sent: Thursday, September 03, 2009 1:27 PM
To: redhat-sysadmin-list at redhat.com
Subject: RE: DHCP on Aliase eth0

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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