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 From:  Ugo Bellavance <ugob at camo dash route dot com>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: DHCP-Scopes - using VLAN?
 Date:  Thu, 07 Apr 2005 17:10:07 -0400
Peter Guhl wrote:
> On Thu, 2005-04-07 at 15:37, Ugo Bellavance wrote:
> 
>>Peter Guhl wrote:
>>
>>>I have to distribute DHCP-Adresses to 2 different subnets. One directly
>>>attached to the LAN-Interface and one routed through a router at the
>>>other end of this LAN. How can I accomplish this? I heard about VLANs
>>>used to add another DHCP-scope; is this the right 
>>
>>Usually, you'd need a "dhcp relay" to make broadcast DHCP packets make 
>>it through the router.
> 
> 
> Yep - but that's the job at the router. This one is probably already set
> up correctly because the m0n0wall only replaces an old FreeBSD-Box doing
> all this before. My problem is that behind the routers there is another
> net but m0n0wall has to be the only DHCP-Server:
> 
> WAN <--> m0n0wall <--> x.x.1.0/23 <--> router <---> router <-->
> x.x.2.0/23
> 
> The old FreeBSD-Box managed this using isc-dhcpd - the same software
> m0n0wall is using.
> 

But the broadcasts generated by m0n0wall won't reach your .2.0 network 
unless you've got a dhcp-relay in each subnet in between.  Of if you've 
got good routers, it might be possible to do that directly on the 
router.  What they usually do is forward all UDP broadcasts to the 
routed subnet.

hth

> Regards
>     Peter