One Server, two interfaces

[Paul Bertain]

Hi Alan,
dhcpd is not listening on rl0, which is why it is not sending  
responses to that domain.

One solution is to setup a helper-address on the router that services  
the 192.168.1.0/24 network that points to the dc0 address.  In Cisco- 
ese:

int vlan<VLAN of 192.168.1.0)
ip helper-address <ip of dc0>

This would forward DHCP requests for the 192.168.1.0/24 network to the  
dc0 interface.  Another alternative is to add the rl0 interface to the  
startup scripts.  Depending on your OS, it may be something like this  
(for Fedora):

DHCPDARGSÜ0

and change it to

DHCPDARGSÜ0 rl0

Paul

On Mar 13, 2008, at 7:47 AM, Alan Neville wrote:

> Jeff:
> Apologies for the delay in getting back to you, but I have attempted
> adding another scope as suggested to my /usr/local/etc/dhcpd.conf,
> but to no avail. The following is a copy of my configuration file;
>
> #option domain-name "example.com";
> option domain-name-servers 213.94.190.194, 213.94.190.236;
> option subnet-mask 255.255.255.0;
>
> default-lease-time 3600;
> max-lease-time 86400;
> ddns-update-style none;
>
> # rl0 (unhealthy)
> subnet 192.168.1.0 netmask 255.255.255.0 {
>  range 192.168.1.10 192.168.1.200;
>  option routers 192.168.1.1;
> }
>
> # dc0 (healthy)
> subnet 192.168.100.0 netmask 255.255.255.0 {
>   range 192.168.100.10 192.168.100.200;
>   option routers 192.168.100.1;
> }
>
> When I plug a system into the "healthy" side, i get a .100 address.
> This is working fine. However, I never get a .1 address when plugged
> into the "unhealthy" side. I have added teh scope and restarted teh
> dhcpd service by issuing /usr/local/etc/rc.d/isc-dhcpd restart. The
> following is a copy of the output;
>
> # /usr/local/etc/rc.d/isc-dhcpd restart
> Stopping dhcpd.
> Starting dhcpd.
> Internet Systems Consortium DHCP Server V3.0.5
> Copyright 2004-2006 Internet Systems Consortium.
> All rights reserved.
> For info, please visit http://www.isc.org/sw/dhcp/
> Wrote 2 leases to leases file.
> Listening on BPF/dc0/00:04:e2:5c:91:dc/192.168.100/24
> Sending on   BPF/dc0/00:04:e2:5c:91:dc/192.168.100/24
> Sending on   Socket/fallback/fallback-net.
>
> I don't see any problems? Any suggestions?
>
> Many Thanks,
>
> A
>
> On 8 Mar 2008, at 04:39, Jeff Sadowski wrote:
>
>> yes just add another subnet block you will see dhcpd say the
>> interfaces it is starting on.
>> you can start it in a number of ways.
>>
>> one way is just to add another scope. another is to have a completely
>> different config file and have another instance of dhcpd for each  
>> nic.
>> If you don't have an address that falls in any of the scopes dhcpd
>> will complain and tell you
>>
>> with a different config file you will need to pass dhcpd the config
>> file option look in the man page.
>> There are plenty of examples in the man page
>>
>> I think you put the nic at the end of the command line
>>
>> On Fri, Mar 7, 2008 at 4:47 PM, Alan Neville
>> <neville.alan at gmail.com> wrote:
>>> Jeff:
>>> I don't quite understand. How does it "figure it out"? Currently, I
>>> have dhcpd working for one of the interfaces. The following is a
>>> copy
>>> of my dhcpd.conf. Should I just add another subnet declaration
>>> block?
>>>
>>> --- snip, snip ---
>>>
>>> option domain-name-servers 213.94.190.194, 213.94.190.236;
>>> option subnet-mask 255.255.255.0;
>>>
>>> default-lease-time 3600;
>>> max-lease-time 86400;
>>> ddns-update-style none;
>>>
>>> # dc0 interface
>>> subnet 192.168.100.0 netmask 255.255.255.0 {
>>>   range 192.168.100.10 192.168.100.200;
>>>   option routers 192.168.100.1;
>>> }
>>>
>>> --- snip, snip ---
>>>
>>> Thanks,
>>>
>>> A
>>>
>>>
>>> On 7 Mar 2008, at 21:31, Jeff Sadowski wrote:
>>>
>>>> dhcpd figures it out based on the ip addresses assigned to those
>>>> nodes.
>>>>
>>>> On 3/7/08, Alan Neville <neville.alan at gmail.com> wrote:
>>>>> Hello,
>>>>>
>>>>> I'm currently setting up a FreeBSD server for a project which
>>>>> has two
>>>>> interfaces (rl0 and dc0) both connected to different VLANs
>>>>> (192.168.1.0/24 and 192.168.100.0/24, respectively). I have been
>>>>> reading through the server installation instructions as per the
>>>>> FreeBSD Handbook (http://www.freebsd.org/doc/en_US.ISO8859-1/ 
>>>>> books/
>>>>> handbook/network-dhcp.html), however, I can't seem to find much re
>>>>> configuring the server to hand out 192.168.1.0/24 addresses  
>>>>> through
>>>>> the rl0 interface and 192.168.100.0/24 through the dc0 from the  
>>>>> one
>>>>> set up. Could someone provide me with a sample dhcp.conf which
>>>>> covers
>>>>> this type of installation?
>>>>>
>>>>> Many Thanks,
>>>>>
>>>>>
>>>>>
>>>>> ---
>>>>> Alan Neville
>>>>> alan.neville3 at mail.dcu.ie
>>>>> CAIS3 / 55626234
>>>>> ---
>>>>> "Shúil do bothar, scríobh do scéal.."
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>>
>>>
>>> ---
>>> Alan Neville
>>> alan.neville3 at mail.dcu.ie
>>> CAIS3 / 55626234
>>> ---
>>> "Shúil do bothar, scríobh do scéal.."
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>
>
>
> ---
> Alan Neville
> alan.neville3 at mail.dcu.ie
> CAIS3 / 55626234
> ---
> "Siúl do bhóthar, scríobh do scéal"
>
>
>
>
>
>