| Author | Messages | |
rezuma
Posts:83
 | | 10/06/2008 3:02 PM |
| Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
| | | |
| Ravi.Sabharanjak@barclaysglobal.com
Posts:72
 | | 10/06/2008 3:18 PM |
| All you need is to enable the IP helpers on your routers, so that they forward the DHCP requests to the DHCP server. The DHCP server has built-in intelligence to look at the forwarded packet and serve IP addresses out of the proper scope. It can figure out the scope to use from the address of the router that forwarded the packet to it, no other setting is needed on the DHCP server other than creating the scopes and setting them up with the proper options.
________________________________
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 11:59 AM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
--
This message and any attachments are confidential, proprietary, and may be privileged. If this message was misdirected, Barclays Global Investors (BGI) does not waive any confidentiality or privilege. If you are not the intended recipient, please notify us immediately and destroy the message without disclosing its contents to anyone. Any distribution, use or copying of this e-mail or the information it contains by other than an intended recipient is unauthorized. The views and opinions expressed in this e-mail message are the author's own and may not reflect the views and opinions of BGI, unless the author is authorized by BGI to express such views or opinions on its behalf. All email sent to or from this address is subject to electronic storage and review by BGI. Although BGI operates anti-virus programs, it does not accept responsibility for any damage whatsoever caused by viruses being passed.
| | | |
| bdesmond
Posts:416
 | | 10/06/2008 3:45 PM |
| The DHCP server will know what to do as long as you have the scopes setup...
Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 1:59 PM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
| | | |
| bhopkins
Posts:7
 | | 10/06/2008 3:55 PM |
| Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks Bruce Hopkins Director Information Technology Chattahoochee Technical College 770-528-4574 http://www.chattcollege.com
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
| | | |
| rmscheck
Posts:81
 | | 10/07/2008 9:11 PM |
| Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com>wrote:
> Just add an IP helper address to each of your Vlans in the router to > point to your DHCP server > > > > Thanks > > Bruce Hopkins > > Director Information Technology > > Chattahoochee Technical College > > 770-528-4574 > > http://www.chattcollege.com > > > > *From:* ActiveDir-owner@mail.activedir.org [mailto: > ActiveDir-owner@mail.activedir.org] *On Behalf Of *Ramon Linan > *Sent:* Monday, October 06, 2008 2:59 PM > *To:* ActiveDir@mail.activedir.org > *Subject:* [ActiveDir] DHCP RELAY? > > > > Hi, > > > > I am segmenting my network in several vlans for security a bandwidth > reason. > > > > How do I go about using the same DHCP server for all the vlans? Someone > told me that I have to enable DHCP relay, I know how to do that in the > switches but I don't know how to configure the dhcp server to offer the > right IP address depending on the VLAN. > > > > Thanks in advance. > > > > Ramon >
| | | |
| hboogz
Posts:31
 | | 10/07/2008 9:21 PM |
| As others have mentioned: As long as your scopes are setup, there isn't much to do on the DHCP server side.
You don't need multiple nics as the DHCP DISCOVER packet will have the necessary IP information int he packet and if the scope for that IP range is defined, you're good.
On Tue, Oct 7, 2008 at 9:08 PM, Rand Salazar <rmscheck08@gmail.com> wrote:
> Another method I've seen if you dont particularly want to enable iphelper > across disparate links is the ability to create virtual interfaces (Broadcom > NICs as far I know do this), and just trunk your DHCP ports to have multiple > VLANs.. not saying this is good or bad, but I have seen it. > > > > > On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com>wrote: > >> Just add an IP helper address to each of your Vlans in the router to >> point to your DHCP server >> >> >> >> Thanks >> >> Bruce Hopkins >> >> Director Information Technology >> >> Chattahoochee Technical College >> >> 770-528-4574 >> >> http://www.chattcollege.com >> >> >> >> *From:* ActiveDir-owner@mail.activedir.org [mailto: >> ActiveDir-owner@mail.activedir.org] *On Behalf Of *Ramon Linan >> *Sent:* Monday, October 06, 2008 2:59 PM >> *To:* ActiveDir@mail.activedir.org >> *Subject:* [ActiveDir] DHCP RELAY? >> >> >> >> Hi, >> >> >> >> I am segmenting my network in several vlans for security a bandwidth >> reason. >> >> >> >> How do I go about using the same DHCP server for all the vlans? Someone >> told me that I have to enable DHCP relay, I know how to do that in the >> switches but I don't know how to configure the dhcp server to offer the >> right IP address depending on the VLAN. >> >> >> >> Thanks in advance. >> >> >> >> Ramon >> > >
| | | |
| robertsingers
Posts:155
 | | 10/07/2008 9:25 PM |
| The benefit to IPHelpers is that you can achieve a certain degree of resilience by having two helpers pointing to different DHCP servers, each with part of the subnet as a scope.
________________________________
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Rand Salazar Sent: Wednesday, 8 October 2008 2:09 p.m. To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] DHCP RELAY?
Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com> wrote:
Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks
Bruce Hopkins
Director Information Technology
Chattahoochee Technical College
770-528-4574
http://www.chattcollege.com <http://www.chattcollege.com/>
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
________________________________
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| | | |
| bdesmond
Posts:416
 | | 10/07/2008 9:27 PM |
| That depends on all the subnets being in the same location usually. If you're centrally delivering DHCP to the branch office then this won't work. 
Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Rand Salazar Sent: Tuesday, October 07, 2008 8:09 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] DHCP RELAY?
Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com<mailto:bhopkins@chattcollege.com>> wrote:
Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks
Bruce Hopkins
Director Information Technology
Chattahoochee Technical College
770-528-4574
http://www.chattcollege.com<http://www.chattcollege.com/>
From: ActiveDir-owner@mail.activedir.org<mailto:ActiveDir-owner@mail.activedir.org> [mailto:ActiveDir-owner@mail.activedir.org<mailto:ActiveDir-owner@mail.activedir.org>] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: ActiveDir@mail.activedir.org<mailto:ActiveDir@mail.activedir.org> Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
| | | |
| hboogz
Posts:31
 | | 10/07/2008 9:35 PM |
| Absolutely Brian.
Hopefully your remote side routers will support IP helpers. I use Netscreen's remotely and they have a convenient option for me to add DHCP-relay -- nice and neat.
On Tue, Oct 7, 2008 at 9:19 PM, Brian Desmond <brian@briandesmond.com>wrote:
> *That depends on all the subnets being in the same location usually. If > you're centrally delivering DHCP to the branch office then this won't work. > * > > * * > > *Thanks,* > > *Brian Desmond* > > *brian@briandesmond.com* > > * * > > *c - 312.731.3132* > > * * > > *From:* ActiveDir-owner@mail.activedir.org [mailto: > ActiveDir-owner@mail.activedir.org] *On Behalf Of *Rand Salazar > *Sent:* Tuesday, October 07, 2008 8:09 PM > *To:* ActiveDir@mail.activedir.org > *Subject:* Re: [ActiveDir] DHCP RELAY? > > > > Another method I've seen if you dont particularly want to enable iphelper > across disparate links is the ability to create virtual interfaces (Broadcom > NICs as far I know do this), and just trunk your DHCP ports to have multiple > VLANs.. not saying this is good or bad, but I have seen it. > > > > > > > > On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com> > wrote: > > Just add an IP helper address to each of your Vlans in the router to point > to your DHCP server > > > > Thanks > > Bruce Hopkins > > Director Information Technology > > Chattahoochee Technical College > > 770-528-4574 > > http://www.chattcollege.com > > > > *From:* ActiveDir-owner@mail.activedir.org [mailto: > ActiveDir-owner@mail.activedir.org] *On Behalf Of *Ramon Linan > *Sent:* Monday, October 06, 2008 2:59 PM > *To:* ActiveDir@mail.activedir.org > *Subject:* [ActiveDir] DHCP RELAY? > > > > Hi, > > > > I am segmenting my network in several vlans for security a bandwidth > reason. > > > > How do I go about using the same DHCP server for all the vlans? Someone > told me that I have to enable DHCP relay, I know how to do that in the > switches but I don't know how to configure the dhcp server to offer the > right IP address depending on the VLAN. > > > > Thanks in advance. > > > > Ramon > > >
| | | |
| AFidel
Posts:75
 | | 10/08/2008 1:34 PM |
| Why not? VPN's can tunnel VLAN's just fine....
Thanks, Andrew
Brian Desmond <brian@briandesmond.com> Sent by: ActiveDir-owner@mail.activedir.org 10/07/2008 09:33 PM Please respond to ActiveDir@mail.activedir.org
To "ActiveDir@mail.activedir.org" <ActiveDir@mail.activedir.org> cc
Subject RE: [ActiveDir] DHCP RELAY?
That depends on all the subnets being in the same location usually. If you?re centrally delivering DHCP to the branch office then this won?t work. 
Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Rand Salazar Sent: Tuesday, October 07, 2008 8:09 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] DHCP RELAY?
Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com> wrote: Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks Bruce Hopkins Director Information Technology Chattahoochee Technical College 770-528-4574 http://www.chattcollege.com
From: ActiveDir-owner@mail.activedir.org [mailto: ActiveDir-owner@mail.activedir.org] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
| | | |
| Ravi.Sabharanjak@barclaysglobal.com
Posts:72
 | | 10/08/2008 1:58 PM |
| Too complicated in my opinion. The IP helpers work great, and the functionality is blessed by the RFC's. They work well for all environments- local as well as remote subnets.
BTW: The same setup is also needed to support PXE clients if they are on a subnet other than the PXE server. The IP helpers in this case would include the PXE server as well. If the PXE server is different from the DHCP server, the IP helpers would have the DHCP as well as the PXE server in the list.
________________________________
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of AFidel@ddrc.com Sent: Wednesday, October 08, 2008 10:30 AM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] DHCP RELAY?
Why not? VPN's can tunnel VLAN's just fine....
Thanks, Andrew
Brian Desmond <brian@briandesmond.com> Sent by: ActiveDir-owner@mail.activedir.org
10/07/2008 09:33 PM
Please respond to ActiveDir@mail.activedir.org
To
"ActiveDir@mail.activedir.org" <ActiveDir@mail.activedir.org>
cc
Subject
RE: [ActiveDir] DHCP RELAY?
That depends on all the subnets being in the same location usually. If you're centrally delivering DHCP to the branch office then this won't work. 
Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Rand Salazar Sent: Tuesday, October 07, 2008 8:09 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] DHCP RELAY?
Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com> wrote:
Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks
Bruce Hopkins
Director Information Technology
Chattahoochee Technical College
770-528-4574
http://www.chattcollege.com <http://www.chattcollege.com/>
From: ActiveDir-owner@mail.activedir.org <mailto:ActiveDir-owner@mail.activedir.org> [mailto:ActiveDir-owner@mail.activedir.org <mailto:ActiveDir-owner@mail.activedir.org> ] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: ActiveDir@mail.activedir.org <mailto:ActiveDir@mail.activedir.org> Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
--
This message and any attachments are confidential, proprietary, and may be privileged. If this message was misdirected, Barclays Global Investors (BGI) does not waive any confidentiality or privilege. If you are not the intended recipient, please notify us immediately and destroy the message without disclosing its contents to anyone. Any distribution, use or copying of this e-mail or the information it contains by other than an intended recipient is unauthorized. The views and opinions expressed in this e-mail message are the author's own and may not reflect the views and opinions of BGI, unless the author is authorized by BGI to express such views or opinions on its behalf. All email sent to or from this address is subject to electronic storage and review by BGI. Although BGI operates anti-virus programs, it does not accept responsibility for any damage whatsoever caused by viruses being passed.
| | | |
| bdesmond
Posts:416
 | | 10/08/2008 2:21 PM |
| Huge mess to say the least. Higher ed loves the whole campus VLAN thing in particular - I hate it.
This might work with half a dozen sites or something, but, what if you had 100 or 500 or 1000 branches. Would you span all those VLANs back to a central datacenter? Would you want that many subinterfaces on a DHCP server?
Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of AFidel@ddrc.com Sent: Wednesday, October 08, 2008 12:30 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] DHCP RELAY?
Why not? VPN's can tunnel VLAN's just fine....
Thanks, Andrew
Brian Desmond <brian@briandesmond.com> Sent by: ActiveDir-owner@mail.activedir.org
10/07/2008 09:33 PM Please respond to ActiveDir@mail.activedir.org
To
"ActiveDir@mail.activedir.org" <ActiveDir@mail.activedir.org>
cc
Subject
RE: [ActiveDir] DHCP RELAY?
That depends on all the subnets being in the same location usually. If you're centrally delivering DHCP to the branch office then this won't work. 
Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Rand Salazar Sent: Tuesday, October 07, 2008 8:09 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] DHCP RELAY?
Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com<mailto:bhopkins@chattcollege.com>> wrote:
Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks
Bruce Hopkins
Director Information Technology
Chattahoochee Technical College
770-528-4574
http://www.chattcollege.com<http://www.chattcollege.com/>
From: ActiveDir-owner@mail.activedir.org<mailto:ActiveDir-owner@mail.activedir.org> [mailto:ActiveDir-owner@mail.activedir.org<mailto:ActiveDir-owner@mail.activedir.org>] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: ActiveDir@mail.activedir.org<mailto:ActiveDir@mail.activedir.org> Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
| | | |
| Patrick
Posts:5
 | | 10/09/2008 7:34 PM |
| I agree - we have VLANs and VPN
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of AFidel@ddrc.com Sent: Wednesday, October 08, 2008 1:30 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] DHCP RELAY?
Why not? VPN's can tunnel VLAN's just fine....
Thanks, Andrew
Brian Desmond <brian@briandesmond.com> Sent by: ActiveDir-owner@mail.activedir.org
10/07/2008 09:33 PM
Please respond to ActiveDir@mail.activedir.org
To
"ActiveDir@mail.activedir.org" <ActiveDir@mail.activedir.org>
cc
Subject
RE: [ActiveDir] DHCP RELAY?
That depends on all the subnets being in the same location usually. If you're centrally delivering DHCP to the branch office then this won't work.

Thanks, Brian Desmond brian@briandesmond.com
c - 312.731.3132
From: ActiveDir-owner@mail.activedir.org [mailto:ActiveDir-owner@mail.activedir.org] On Behalf Of Rand Salazar Sent: Tuesday, October 07, 2008 8:09 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] DHCP RELAY?
Another method I've seen if you dont particularly want to enable iphelper across disparate links is the ability to create virtual interfaces (Broadcom NICs as far I know do this), and just trunk your DHCP ports to have multiple VLANs.. not saying this is good or bad, but I have seen it.
On Mon, Oct 6, 2008 at 2:24 PM, Bruce Hopkins <bhopkins@chattcollege.com> wrote:
Just add an IP helper address to each of your Vlans in the router to point to your DHCP server
Thanks
Bruce Hopkins
Director Information Technology
Chattahoochee Technical College
770-528-4574
<http://www.chattcollege.com/> http://www.chattcollege.com
From: <mailto:ActiveDir-owner@mail.activedir.org> ActiveDir-owner@mail.activedir.org [mailto: <mailto:ActiveDir-owner@mail.activedir.org> ActiveDir-owner@mail.activedir.org] On Behalf Of Ramon Linan Sent: Monday, October 06, 2008 2:59 PM To: <mailto:ActiveDir@mail.activedir.org> ActiveDir@mail.activedir.org Subject: [ActiveDir] DHCP RELAY?
Hi,
I am segmenting my network in several vlans for security a bandwidth reason.
How do I go about using the same DHCP server for all the vlans? Someone told me that I have to enable DHCP relay, I know how to do that in the switches but I don't know how to configure the dhcp server to offer the right IP address depending on the VLAN.
Thanks in advance.
Ramon
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