Does the SBS 2011 server have to be set up as a DHCP server?

wthrottle
wthrottle used Ask the Experts™
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When running the SBS 2011 initial set up the wizard detects DHCP is running on our router.  It states the DHCP must be disabled on the router for the SBS internet connection wizard to complete.  Is it possible to work around this?  Or must we turn DHCP off on the router?  Note:  The router is a 2Wire 3600 and AT&T states DHCP cannot be disabled on the device.
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As a workaround, during that phase of setup, just unplug your 2011 SBS from the router.

Author

Commented:
It seems the SBS ICW aquires all the IP, gateway, etc. prior to running the ICW.  Would the ICW have the information it needs from the router to complete the ICW once the router is disconencted?

If this is successful once the SBS server is re-connected to the router then there would be two (2) DHCP servers on the network.  Would it cause problems to disable the DHCP service on the SBS 2011 server?
Alot of IT depts don't use Windows DHCP anyway. So turing if off on the Server should have no bearing.
Getting past the ICW wizard is your goal at this point. Your server should never have a DHCP address anyway so hopefully you plan on giving it static info once the server is up and running.
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Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
DHCP _has_ to be installed on SBS.

AD, DNS, RWA --> RDP, and more all depend on the ability to track what machine is where.

Having DHCP on the router serves no real purpose.

Plus, DNS needs to point to SBS on all machines anyway otherwise all sorts of problems are experienced.

Philip
Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
Kenmcse, I suggest getting familiar with how SBS works. Giving the wrong advice for an SBS setup can be catastrophic in nature. BTDT.

Philip

Author

Commented:
Philip, thanks for the SBS specific advice.  As a workaround I have considered letting the DHCP scope on the AT&T 2Wire 3600 UVerse router to hand one static public IP to the Watchguard x55 firewall, turn off DHCP on the Watchguard firewall, and use the Watchguard as the gateway for the SBS 2011 server.  Run the ICW with the 2Wire 3600 unplugged, and then reconnect when (if) ICW completes.  I would then leave DHCP *enabled* on the SBS 2011 server.  Do you enision any problems with this approach?  Thanks.
Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
_Any_ DHCP service found on the SBS network will cause the SBS DHCP service to shut down.

Set your 2Wire to Bridge mode to pass the ISP connection through to the Watchguard.

Philip

Author

Commented:
AT&T tech support states the 2Wire 3600 cannot be put in bridge mode, and DHCP cannot be turned off.  It is a UVerse connection.  The speed is good, but the 2Wire 3600 apepars to have limited configuration options.
Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
Can the 3Wire port forward? If not, then it is not going to work.

Philip

Author

Commented:
I found the link (pasted below) in the AT&T user forum.  The post from 'SomeJoe7777' on page one seems to be a work around for the inability to put the 2Wire 3600 into bridge mode.  The rest of the pages in the post have a lot of off-topic dialog.  Essentially this configuration would pass all traffic through to our Watchguard x55e.  DHCP would still be enabled on the 2wire, but the 2Wire would be behind the Watchguard firewall.  Would the SBS Server still be able to detect the 2Wire's DHCP server if it is behind the Watchguard firewall?

http://forums.att.com/t5/Residential-Gateway/U-verse-for-BUSINESS-2Wire-3600HGV-bridge-mode-or-another-AT-amp/td-p/2707013
Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
As I understand the cable diagram:

2Wire --> WAN - Watchguard - LAN --> Switch <-- SBS + PCs/Laptops

Philip

Author

Commented:
Correct
Sorry I disappeared for a short time but business called. I still see Philip is trying to keep you from just disabling DHCP on the SBS 2011 box. I do agree with him that SBS 2011 likes to be the Boss and it will probably run smoothly but its fully ok to turn off DHCP if you have to.
Read this short article. Its for SBS 2008 but I believe the steps should be pretty close if not exact.

http://sbs.seandaniel.com/2008/10/do-i-absolutely-have-to-run-dhcp-on-sbs.html 

If all else fails, just reenable and go back to where you started.
Technical Architect - HA/Compute/Storage
Commented:
Since you have stated that my diagram is right, then:

ISP --> 2Wire DHCP --> WAN - Watchguard (blocks WAN DHCP) - LAN --> Switch <-- SBS + PCs

DHCP on the 2Wire would only be seen by the Watchguard. Thus you do not need DHCP enabled on the Watchguard. SBS would take care of this.

Set a reservation in the 2Wire for the Watchguard so that you can port forward 25, 443, and 987 to the Watchguard and then on to SBS.

Philip

Author

Commented:
Thank you for the advice.  I apologize for the delayed follow up.

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