VLAN & DHCP server

[Suhaime Raeze]

im trying to understand the whole process of how clients from various vlan receive the dhcp signal from one server..Ive read somewhere that scopes are needed can anybody elaborate more on that?


----------------------------------------
> Date: Fri, 14 Dec 2007 23:41:35 +1100
> From: Glenn.Satchell at uniq.com.au
> Subject: Re: VLAN & DHCP server
> To: dhcp-users at isc.org
> 
> If you label your host statements like:
> 
>    host myhost-vlan2  { hardware ethernet 00:01:02:03:04:05; }
> 
> 
>    host myhost        { hardware ethernet 00:01:02:03:04:05;
>                         fixed-address 192.168.1.10; }
> 
> then it will mostly do what you want, and you don't need the concat bit.
> 
> regards,
> -glenn
> 
>>Date: Thu, 13 Dec 2007 08:04:05 -0800
>>From: Alan Hagge 
>>To: dhcp-users at isc.org
>>Subject: Re: VLAN & DHCP server
>>
>>All true; however the problem that I've run into is when I want to
>>assign fixed addresses to one VLAN interface on a host, while allowing
>>others to be pulled from a pool.  I attempted to send this to the list
>>on a prior occasion, but apparently it never appeared:
>>
>>-----
>>Our network consists of two VLANs, both served by a single DHCP server
>>(with direct connections to both VLANs).  Some of our client machines
>>are in one VLAN, some in both.  Some need fixed addresses in one or the
>>other VLAN, a few need them in both.  Most need only pooled addresses in
>>both.  I need to use DDNS to set hostnames for each IP address. How can
>>I set this up?
>>
>>Here's what I've tried.  In one VLAN (the "primary" LAN), the
>>ddns-hostname is set to
>>
>>  subnet 192.168.1.0 netmask 255.255.255.0 {
>>    ddns-hostname = host-decl-name;
>>    ...
>>  }
>>
>>while in the other VLAN (the "secondary"), I append to the
>>host-decl-name to get the name to send to DNS:
>>
>>  subnet 192.168.2.0 netmask 255.255.255.0 {
>>    ddns-hostname = concat(host-decl-name,"-vlan2");
>>    ...
>>  }
>>
>>dhcpd won't let me have more than one "host" section with the same
>>hostname, so I've tried various options:
>>
>>   host myhost        { hardware ethernet 00:01:02:03:04:05; }
>>
>>works, assigns IP addresses (from pools in both subnets) and updates DNS
>>with correct hostnames and IP addresses.
>>
>>  host myhost        { hardware ethernet 00:01:02:03:04:05;
>>fixed-address 192.168.1.10; }
>>
>>doesn't work.  VLAN1 is assigned correctly (myhost->192.168.1.10), VLAN2
>>is assigned an IP address from a pool but not given the specified
>>hostname in DNS.  Syslog has "dhcpd: data: host_decl_name: not
>>available", indicating that it's not using this host line for the
>>MAC-address-to-hostname mapping.
>>
>>  host myhost        { hardware ethernet 00:01:02:03:04:05;
>>fixed-address 192.168.2.10; }
>>
>>doesn't work.  Same as above, but with the VLANs reversed.
>>
>>  host myhost        { hardware ethernet 00:01:02:03:04:05;
>>fixed-address 192.168.1.10, 192.168.2.10; }
>>
>>works, assigns IP addresses (to specified fixed addresses) and updates
>>DNS with correct hostnames and IP addresses.
>>
>>
>>Is there something I'm missing?  Is there some other syntax to use to
>>have a single host, with one MAC address, able to be assigned to a
>>pooled address in one VLAN and a fixed address in another VLAN?
>>
>>Thanks in advance...
>>
>>
>>Any advice is appreciated,
>>
>>Alan
>>
>>P.S.  Sorry for hijacking the thread...
>>
>>Tim Peiffer wrote:
>>> This is a frequently asked question that could have been researched
>>> before asking.   The first URI I would recommend is a search engine:  
>>...
>>>
>>> Suhaime Raeze wrote:
>>>> Im new at configuring dhcp server for vlan. I tried to find sources
>>>> from the net and there are various ways which i admit is too
>>>> complicated or i couldnt comprehend the instructions.
>>> ...
>>
>>
> 

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