Running a DHCP server on multihomed Linux

Hi

Im using openSuSE 10.3 and I have a 2 network cards :

eth0 is 10.0.0.0/8 and eth1 is 192.168.0.0/24

There is no packet forwarding between the interfaces.

Im using the DHCP server shipped with openSUSE and want to be able to
configure it so that the DHCP server listens on both interfaces and is
able to issue appropriate IP's to each network. Is it possible to do
this? Can the DHCP server work with 2 interfaces? I thought perhaps I
could configure 2 copies of the dhcp server to listen to each
interface seperately, but that seems like a crappy way doing things...

Havn't found much on this topic trawling through Google ...anyone know
where to start?

On 4 Jan, 14:28, Davide Bianchi <davideyeahs...@onlyforfun.net> wrote:
> On 2008-01-04, Suk <suk...@zoom.co.uk> wrote:
>
> > Im using the DHCP server shipped with openSUSE and want to be able to
> > configure it so that the DHCP server listens on both interfaces and is
> > able to issue appropriate IP's to each network. Is it possible to do
> > this?
>
> Sure it is, just read the man page of dhcpd and configure it
> accordly.
>
> > where to start?
>
> the man page of dhcpd
>
> Davide
>
> --
> I used to be interested in Windows NT, but the more I see of it the more
> it looks like traditional Windows with a stabler kernel. I don't find
> anything technically interesting there. In my opinion MS is a lot better
> at making money than it is at making good operating systems.
> -- Linus Torvalds

Thanks but if you don't know the answer then please dont post a reply

If you know the answer, then try typing in something helpful rather
than trying to act "smart"

I wouldn't be asking If I hadn't tried the obvious already. If you
know something I dont - why dont you try sharing your knowledge?

Suk <sukesh@zoom.co.uk> wrote:
> Im using the DHCP server shipped with openSUSE and want to be able to
> configure it so that the DHCP server listens on both interfaces and is
> able to issue appropriate IP's to each network. Is it possible to do
> this?

On 4 Jan, 14:28, Davide Bianchi replied:
> Sure it is, just read the man page of dhcpd and configure it
> accordly.

Suk <sukesh@zoom.co.uk> wrote:
> Thanks but if you don't know the answer then please dont post a reply

man dhcpd says, variously, the following:

(a) In the section "COMMAND LINE",

The names of the network interfaces on which dhcpd should listen
for broadcasts may be specified on the command line. [...] If
no interface names are specified on the command line dhcpd will
identify all network interfaces which are up [...] and listen for
DHCP broadcasts on each interface.


(b) In the section CONFIGURATION,

The syntax of the dhcpd.conf(5) file is discussed separately. This
section should be used as an overview of the configuration process,
and the dhcpd.conf(5) documentation should be consulted for detailed
reference information.


The referenced man page for dhcpd.conf says:

Declarations are used to describe the topology of the network, to
describe clients on the network, to provide addresses that can be
assigned to clients, or to apply a group of parameters to a group
of declarations.


On my Debian box (admittedly not openSUSE, about which I have no
information) there's even an example file under /usr/share/doc/ that
includes the sort of thing you need.


Seems pretty clear to me.
Chris

>
> Thanks but if you don't know the answer then please dont post a reply
>
> If you know the answer, then try typing in something helpful rather
> than trying to act "smart"
>
> I wouldn't be asking If I hadn't tried the obvious already. If you
> know something I dont - why dont you try sharing your knowledge?

I agree. Linux supporters are full of idiots pretending they know
something when all they can do is spout "read the man pages".

On 2008-01-04, Suk <sukesh@zoom.co.uk> wrote:
> On 4 Jan, 14:28, Davide Bianchi <davideyeahs...@onlyforfun.net> wrote:
>> On 2008-01-04, Suk <suk...@zoom.co.uk> wrote:
>>
>> > Im using the DHCP server shipped with openSUSE and want to be able to
>> > configure it so that the DHCP server listens on both interfaces and is
>> > able to issue appropriate IP's to each network. Is it possible to do
>> > this?
>>
>> Sure it is, just read the man page of dhcpd and configure it
>> accordly.
>>
>> > where to start?
>>
>> the man page of dhcpd
>>
>> Davide
>>
>
> Thanks but if you don't know the answer then please dont post a reply
>
> If you know the answer, then try typing in something helpful rather
> than trying to act "smart"
>
> I wouldn't be asking If I hadn't tried the obvious already. If you
> know something I dont - why dont you try sharing your knowledge?

But did you read the man page of dhcpd?

It says:

Subnets
dhcpd needs to know the subnet numbers and netmasks of all subnets for which it will be providing
service. In addition, in order to dynamically allocate addresses, it must be assigned one or more
ranges of addresses on each subnet which it can in turn assign to client hosts as they boot. Thus,
a very simple configuration providing DHCP support might look like this:

subnet 239.252.197.0 netmask 255.255.255.0 {
range 239.252.197.10 239.252.197.250;
}


So, my dear friend, you need to have two "subnet" clauses!!!

i