Re: Multi DHCP Scopes across Fiber M.A.N.

You can counter a bit the dhcp trouble by having long lease of 8 or even 24 hours, so you have time to repair.

--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"Phillip Windell" <philwindell@xxxxxxxxxxx> wrote in message news:utv9QMg2HHA.3640@xxxxxxxxxxxxxxxxxxxxxxx
Keep in mind that centralizing DHCP is potentially a bad idea and will be disaster if the fiber goes down. The client will not get thier address and will default to the 169 auto addressing and the LAN at the site would collapse.

The best solution is a Windows Server at each location that is a DC/DNS and a DHCP. You use the AD Site Object to maintain the AD replication over the slow link. This way the system will still function if the fiber goes down.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft, or anyone else associated with me, including my cats.
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Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Troubleshooting Client Authentication on Access Rules in ISA Server 2004
http://download.microsoft.com/download/9/1/8/918ed2d3-71d0-40ed-8e6d-fd6eeb6cfa07/ts_rules.doc

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

Microsoft ISA Server Partners: Partner Hardware Solutions
http://www.microsoft.com/forefront/edgesecurity/partners/hardwarepartners.mspx
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"SeriousSam" <Pleasereply@xxxxxxxxxxxxxxxxx> wrote in message news:%23qo7BAf2HHA.5160@xxxxxxxxxxxxxxxxxxxxxxx
Sweet! Thanks for the direction Anthony. I checked out the IP Helper set up in the routers and it looks like it should be a clean and fairly easy way to go. I wondered what exactly the IP Helper function was for. Have a great day.


"Anthony" <anthony.spam@xxxxxxxxxxxxxx> wrote in message news:eGSGCZe2HHA.4672@xxxxxxxxxxxxxxxxxxxxxxx
Sam,
Set up the scopes on the central DC.
Set an ip helper address on each router to forward the DHCP requests to the DC. The central DHCP server will respond to requests with an address in the scope where the request came from.
Anthony
http://www.airdesk.co.uk



"SeriousSam" <Pleasereply@xxxxxxxxxxxxxxxxx> wrote in message news:ux4$rFe2HHA.4400@xxxxxxxxxxxxxxxxxxxxxxx
Windows 2003 D.C. Server Fully patched.
4 Cisco 1841 routers holding fiberoptic metro area network connections

Main Office: 192.168.100.0/24 DHCP managed by DC
Office 2 192.168.101.0/24 DHCP managed by Cisco router
Office 3 192.168.102.0/24 DHCP managed by Cisco router
Office 4 192.168.103.0/24 DHCP managed by Cisco router

All four locations connected together via fiber optic metro area network on a private VLAN.


I have a domain controller issuing DHCP at my main location. At each of the other 3 locations, the Cisco 1841 router at that location is acting as DHCP server for that local subnet. I would prefer to centralize DHCP on the domain controller, and still be able to keep my subnet addressing scheme as is. I know that my routers can function as DHCP relays, but this is only one of the options I have studied. Im not clear on how to structure this so that each machines in each office receive an address that is correct for their location. Some articles have inferred that RRAS would be necessary as well. If someone can give a basic illustration of how this would work and which network management applications have to be in the loop, i can go from there. TIA for any advice or informative articles.








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