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DHCP on a LAN - is it a good idea to run 2 ?

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Old 16 November 2007, 04:39 PM
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spectrum48k
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Default DHCP on a LAN - is it a good idea to run 2 ?

We already employ our Win2k Server for this, but I was wondering in the event of a failure, why not use the DHCP server built into the firewall too ?

Is there any reason I *shouldn't* do this, or does it make sense to do it?

Obviously the 2 DHCP servers scope's won't overlap each other eg.

DHCP #1 = 192.168.0.100 - 154
DHCP #2 = 192.168.0.200 - 254

Last edited by spectrum48k; 16 November 2007 at 04:48 PM.
Old 16 November 2007, 04:46 PM
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Sonic'
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I have set multiple DHCP servers up at a customers request, with half the scope on one server and half the scope on the other (large scope)

The reason they wanted this was incase they ever had to reboot one of the servers, or take it offline

I had the other scopes on both servers but de-activated
Old 16 November 2007, 05:49 PM
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jowl
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I believe it is a good idea.
Old 16 November 2007, 06:42 PM
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kelvin
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We do this at our place for redundancy... good idea in my opinion
Old 16 November 2007, 07:42 PM
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Luminous
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If you don't have many machines you can just assign static IPs. Do away with the need although basically. That way if you need to directly connect to a particular computer (thinking port forwarding for gaming, ftp, torrents, video conferencing, etc) then you just can.
Old 16 November 2007, 09:04 PM
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spectrum48k
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thanks guys
Old 16 November 2007, 09:26 PM
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ChrisB
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I run this on a few LANs to add a bit of fault tolerance. Only potential downside is that if you have reservations in place they might not work as you can't force a client to always use a specific DHCP server (well, AFAIK!).

Not a major problem, just means giving statics out instead.

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Old 17 November 2007, 01:21 AM
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spectrum48k
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Originally Posted by ChrisB
I run this on a few LANs to add a bit of fault tolerance. Only potential downside is that if you have reservations in place they might not work as you can't force a client to always use a specific DHCP server (well, AFAIK!).

Not a major problem, just means giving statics out instead.
oh right, so if one DHCP goes off and the lease expires, the PC *doesn't* automatically use an IP address given to it by another available DHCP server ?
Old 17 November 2007, 12:33 PM
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Sonic'
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Chris

I have added in the past all the reservations on a second DHCP server but left it deactivated, if the primary one goes off, you just need to activate the secondary one, it seems to work pretty well, but still needs manual intervention
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