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Re: Multiple DHCP servers

You'll have a race condition whereby both DHCP servers will try to serve up an address. You can get away with this by making sure that both assign different ranges of addresses:
DHCP 1 serves 10.0.1.1 - 10.0.1.100 and DHCP 2 serves 10.0.1.101 - 10.0.1.200 or some such. That way, regardless of who wins the race, there won't be overlaps. Also, once a server "wins," the client should keep requesting the same address from the same DHCP server.

You might even get away with overlaps, since the server is supposed to check that the address isn't already taken, but that would be like the old LocalTalk/EtherTalk method of getting an address.

John
On Jul 20, 2004, at 12:08, Kyle Putzier wrote:

What happens when there are multiple DHCP servers on the same network?

I am now using an Airport as my router because the Linksys router I was
using could only map 10 ports and I need more than that. DHCP on the Airport
works fine, except it doesn't supply the clients with a DNS server. No
problem, I'll just shut off the DNS part of the Airport and use MacOS X
Server's DHCP server. But that also shuts off NAT and Port Mapping on the
Airport. If I leave the Airport's DHCP running and set the address pool on
the Airport to 1, and also run the DHCP on the MacOS X server, what will
happen?

-- Kyle Putzier
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John P. Mundt Network Manager
Hawthorn District 73 email@hidden
Vernon Hills, IL 60061 847-990-4591
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References: 
 >Multiple DHCP servers (From: Kyle Putzier <email@hidden>)



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