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Clients DHCP lease received from incorrect server

We currently have a few sites running over a vlan.  Each site has its own domain, server (win 2003 sbs), and is each running DHCP.

Site A, Site B, Site C.

At site A, DHCP is working fine and leases stay restricted to that site with that specific subnet eg. 192.168.1.xx.
However, at Site C, clients are receiving Leases from Site B even though DHCP is setup at Site C.  Site A never gets any leases from Site B.
Site B is leasing addresses fine within its location and domain.

I am at a loss at why this is occuring.  DHCP settings are identicle at each site. Please help.

Cheers,

Bryan
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andre_baljeu
Asked:
andre_baljeu
1 Solution
 
bmquintasCommented:
What are the subnets for  site B and C?
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merowingerCommented:
why dont set reservations on the pcs mac adresses?

mero
0
 
crissandCommented:
The vlans are not correct set.
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andre_baljeuAuthor Commented:
Okay, so this is a routing issue?  Site B is 192.168.20.xx and Site C is 192.168.30.xx.

Please confirm whether this is a routing issue or a DHCP setting issue.  If it is routing, could you please explain why this is happening.
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bmquintasCommented:
I'll go with crissand on this one, if the 3 vlan's were configured correctly there would be no chance of contact between them, unless you have a top level router connecting them all that is enabling them to "see each other", which i don't believe.
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crissandCommented:
None. The two vlans are mixed together, and computer from one network can request addresses from the other one. See here an example:

                           switch
                      vlan1     vlan2
                        |            |
                     comp1   comp2

The logical separation of vlans in switches must be followed by a physical separation of the wall connector. Usually is better to mark these wall connections.
0

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