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I have setup my Mac OS X server as a DHCP server and it is working fine. Now I have just connected a second switch to my old one (both gigabit) but the people who connect to the new switch are sometimes unable to get a IP address. What seems to be the problem?

Also, I have noticed that this problem goes away when i use a router as a dhcp server.

Any solutions???

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"Sometimes"? Is the problem intermittent? – Satanicpuppy Dec 4 '09 at 22:53
Are these managed switches, and are you using multiple VLANs if they are? – sparks Dec 4 '09 at 22:54

Did you check whether there are enough IP addresses available in DHCP pool?

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You might want to check out your firewall settings DHCP is a layer 7 protocol, requests are on UDP port 68, replies on UDP 67. You will need port 68 open your server, 67 on the client

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