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2 dhcp servers on same network
- Thread starter dpw666
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sibawe2000
IS-IT--Management
Hi,
I strongly advise you not to put more than one DHCP server on your network. Adding more than 1 generates huge trouble, and it's usually hard to debug.
Sharing IP adresses shouldn't be an issue , since you're already sharing a cable ... Why would users want to know their IP adresses anyways?
I guess the users in your network authenticate. Create 2 separate domains, 1 for each company, then add each machine to it's company's domain. The domains will be visible , but each company's data will be separate and unaccessbile by the other. This will also allow you to keep a unique IP address on your inernet router.
Or you can try WIFI ...
Good luck
I strongly advise you not to put more than one DHCP server on your network. Adding more than 1 generates huge trouble, and it's usually hard to debug.
Sharing IP adresses shouldn't be an issue , since you're already sharing a cable ... Why would users want to know their IP adresses anyways?
I guess the users in your network authenticate. Create 2 separate domains, 1 for each company, then add each machine to it's company's domain. The domains will be visible , but each company's data will be separate and unaccessbile by the other. This will also allow you to keep a unique IP address on your inernet router.
Or you can try WIFI ...
Good luck
WhoKilledKenny
MIS
I am honestly puzzled? I'm not posting this just to disagree with sibawe2000, I would like to know the reason (other than generates huge trouble) why he strongly advises against more than one DHCP server.
sibawe2000
IS-IT--Management
Hi,
I see at least 2 reasons:
1/ if your client sends a DHCP request, he'll receives 1 answer per DHCP server. If he's smart, he'll drop the second and above. If he's not ... If the second or above DHCP server are stubborn, he'll resend the answer another time, ... not good
2/ Each DHCP will reserve his address to the client... not good. if your DHCP servers are somehow linked to DDNS servers, your host might even get a host entries with a non-existent ip addresses
I had such a conflict 2 weeks ago. The tricky part is that the incident looks like a physical shortcoming (faulty cable, faulty network card, etc...) and you get caught in the wrong debugging.
I see at least 2 reasons:
1/ if your client sends a DHCP request, he'll receives 1 answer per DHCP server. If he's smart, he'll drop the second and above. If he's not ... If the second or above DHCP server are stubborn, he'll resend the answer another time, ... not good
2/ Each DHCP will reserve his address to the client... not good. if your DHCP servers are somehow linked to DDNS servers, your host might even get a host entries with a non-existent ip addresses
I had such a conflict 2 weeks ago. The tricky part is that the incident looks like a physical shortcoming (faulty cable, faulty network card, etc...) and you get caught in the wrong debugging.
WhoKilledKenny
MIS
Best practices
Use the 80/20 design rule for balancing scope distribution of addresses where multiple DHCP servers are deployed to service the same scope.
Using more than one DHCP server on the same subnet provides increased fault tolerance for servicing DHCP clients located on it. With two DHCP servers, if one server is unavailable, the other server can take its place and continue to lease new addresses or renew existing clients.
A common practice when balancing a single network and scope range of addresses between two DHCP servers is to have 80 percent of the addresses distributed by one DHCP server and the remaining 20 percent provided by a second. For more information and an example of this concept, see Configuring scopes
Use the 80/20 design rule for balancing scope distribution of addresses where multiple DHCP servers are deployed to service the same scope.
Using more than one DHCP server on the same subnet provides increased fault tolerance for servicing DHCP clients located on it. With two DHCP servers, if one server is unavailable, the other server can take its place and continue to lease new addresses or renew existing clients.
A common practice when balancing a single network and scope range of addresses between two DHCP servers is to have 80 percent of the addresses distributed by one DHCP server and the remaining 20 percent provided by a second. For more information and an example of this concept, see Configuring scopes
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