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Home > Archive > 70-216 > August 2002 > DHCP question
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| Slinky 2002-08-10, 5:55 pm |
| *edit*
Never mind.  | |
| buckwheat 2002-08-10, 6:28 pm |
| Yeah, I'm confused by what you're saying.
quote:
Originally posted by Slinky
The first one was 192.168.33-192.168.62, I excluded 20% of these addresses, and the second scope 192.168.1.65-192.168.1.93, and I excluded 80% of these addresses.
BTW, you left out an octet.
If I understand you so far you have two subnets, each with a DHCP server in it. You created one scope for each subnet on each of the server. Right?
From what I already know, with that kind of setup and to avoid possible address conflicts, no address should belong to more than one scope.
For example, say one DHCP server supports 100 clients on the local subnet with a scope 192.168.1.1 thru 192.168.1.100. A second DHCP server on the other subnet would server as the fail-over server for those same clients on that first subnet but would host a scope comprising 192.168.1.101 thru 192.168.1.200 instead.
Since you disable one of the DHCP server, the other DHCP server on the other subnet serves assigned a different address to the client affected by the disabled server. The fail-over DHCP server cannot contain a duplicate scope of another DHCP server.
I hope that explanation helps with your question.
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| charlie69 2002-08-10, 6:58 pm |
| d | |
| charlie69 2002-08-10, 7:06 pm |
| I'd like to see the original e-mail but it is not listed on this thread.
There is a 25%, 75% rule used for fault tolerance. It would work like this.
Subnet A Uses 192.168.1.0
Subnet Mask is 255.255.255.0
DHCP Scope is 192.168.1.1 - 192.168.1.75 for this subnet and then another scope of
192.168.2.76 - 192.168.2.100 for fault tolerance in case the other DHCP server in subnet B goes down to assign to those clients.
Subnet B Uses 192.168.2.0
Subnet mask of 255.255.255.0
DHCP scopes are 192.168.2.1 - 192.168.2.75
in case the DHCP server in SN A is down
it also has a scope of 192.168.1.76 - 192.168.1.100 for the clients in Subnet A.
It is known that possibly not all clients in Subnet A would get an IP if its own DHCP server is down, but at least some of the clients would until the other server is back up. Obviously you would need either a relay agent or BOOTP router in this scenario.
Is this what you were asking? I didn't see the original messsage. | |
| Slinky 2002-08-10, 7:38 pm |
| I deleted the post because I figured out what I was doing wrong. I didn't read the section "Configuring a Multihomed DHCP server". Now that I read it I understand. Thanks for the assistance though. | |
| Slinky 2002-08-10, 8:41 pm |
| Now my next question is, how the heck do you configure a multihomed DHCP server? I have one NIC, IP address of 192.168.1.62, and when I try to add the IP address of the other NIC, 192.168.1.65, to the DHCP console it says its already there. BTW these NICs are on different subnets. I've looked through the help files but they didn't really explain it very well. I messed around with the DHCP bindings and made sure that only one IP was bound to DHCP, but nothing seemed to work. What am I doing wrong here? | |
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| Slinky 2002-08-11, 12:21 am |
| I understand whats going on now, the thing now is that I have no clue on how to configure a multihomed DHCP server. When I try to add another server it says its already there, and won't add it. The help files really aren't that helpful. | |
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| Slinky,
from your 'edited' post you said you found the problem, but could you repost the problem jus for the knowledge of others. |
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