Solved

Multiple DHCP Servers and access

Posted on 2008-06-16
6
501 Views
Last Modified: 2012-08-14
we have multiple dhcp servers in our 2003 org, each backing up the other with exemptions. Occasionianlly a PC will grab an IP from our DHCP server on the other side the ocean, the scopes are identical but something is different, the PC can not access certain internal sites or servers.

our current work around is to restart the DHCP client service on the impacted workstations
0
Comment
Question by:kf4ape
6 Comments
 
LVL 2

Expert Comment

by:grahammj
Comment Utility
DHCP, by itself, can't be routed.  You could turn off your IP Helper address in your router configurations from those sites.

It can't access the local sites because I'm guessing the DNS servers are different between sites (that and/(or) the default gateway is different between sites).  
0
 
LVL 1

Author Comment

by:kf4ape
Comment Utility
the scopes are identical and if we turn off the IP Helper we loose our redunecy
0
 
LVL 70

Expert Comment

by:KCTS
Comment Utility
The normal method is to use a split scope with the local server having 80% of the available leases and the remote server the other 20%. When a client requests a DHCP it does so via a broadcast, all DCHP servers that see the broadcast will offer an IP, the client will accept the first one to be offered. Normally this will be the closest DHCP server as it responds first. If the local DCHP server is busy then occasionally the remote DHCP server may get in first - this is to be expected and is the way in which DHCP works - You cannot to this any other way.
0
How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

 
LVL 1

Author Comment

by:kf4ape
Comment Utility
KCTS,
I understand DHCP and how it works, and the 20/80 is not the prob...I could care less which server gives the IP...the prob is when the one that is across the ocean gives an IP, all the sudden it can not access servers, websites yet the scopes are identical...both are 2003 boxes
0
 
LVL 38

Expert Comment

by:ChiefIT
Comment Utility
That's probably because the preferred DNS servers, that are handed down by your DHCP config, are not reachable by that client. Look at the client's ipconfig /all and see what the "preferred DNS servers" are for that client when this happens. If they are your overseas site's DNS servers, you know that is passed down from DHCP config on your overseas servers.

Have you thought about disabling the ability to tunnel DHCP to and from your overseas site?

0
 
LVL 1

Accepted Solution

by:
kf4ape earned 0 total points
Comment Utility
ChiefIT - the scopes on both side of the pond are configured identical...we found out yesterday after calling MS, dell and OEM drivers arent the same for w2k boxes...
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Suggested Solutions

by Batuhan Cetin Within the dynamic life of an IT administrator, we hold many information in our minds like user names, passwords, IDs, phone numbers, incomes, service tags, bills and the order from our wives to buy milk when coming back to home.…
Many of us need to configure DHCP server(s) in their environment. We can do that simply via DHCP console on server or using MMC snap-in on each computer with Administrative Tools installed in a network. But what if we have to configure many DHCP ser…
Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

6 Experts available now in Live!

Get 1:1 Help Now