Question

2 DHCP networks on same switch

Asked by: northcide

Ok, I am trying to figure out a way to run DHCP in parallel to another AD running DHCP on the same switch.  Long story, but there are two domains on the same switch.  they are completely separate entities and have no trust relationship, nor will they.  They have to stay on the same switches.

Is there any way I can run DHCP in parallel with the other AD without them messing each other up (which would normally happen of course).

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Asked On
2003-03-24 at 04:41:19ID20560876
Tags

dhcp

,

same

,

switch

,

2

,

networks

Topic

Windows 2000 Operating System

Participating Experts
5
Points
125
Comments
8

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Answers

 

by: makerpPosted on 2003-03-24 at 05:01:20ID: 8194706

can you not create a super net. i.e. two different sub-nets on the same segment. could you not give each set of machines different ip adresses at the network part..

so if your subnet mask is

255.255.255.0

have one set of machines use 102.168.2.
and the other set 192.168.3

i think this may work

 

by: northcidePosted on 2003-03-24 at 07:41:00ID: 8195860

I'm a bit confused.  You are basically telling me to use different subnet masks to allow two different dhcp networks to co-exist on the switch correct?  well how is this possible if the DHCP server is the object leasing this information to the clients?

 

by: Xavier_BERTHIERPosted on 2003-03-24 at 08:45:40ID: 8196399

Maybe it is possible to configure 2 VLAN on your switch to separate the DHCP servers ?

 

by: makerpPosted on 2003-03-24 at 09:47:06ID: 8196812

ah, of course. thats not such a good suggestion then is it...

in that case either the VLAN option or stop using two DHCP servers and try and re-configure you setup so it works okay with just the one DHCP server and the two domains...

 

by: aftershoqPosted on 2003-03-24 at 10:38:28ID: 8197150

vlans should prevent the DHCP broadcast that you're worried about.

 

by: MSGeekPosted on 2003-03-24 at 10:55:48ID: 8197255

If the hardware and/or IOS support VLANs, 2 seperate VLANs create seperate broadcast domains.  Thus you can definitely have two DHCP servers on one switch as long as the ports are in seperate VLANs.

 

by: NaydowskiPosted on 2003-03-25 at 00:47:44ID: 8201226

Hi!

Do you use the DHCP Relay / IPHelper functionality of the switch? If you do that, you will get trouble.

Disable this functionality and put the DHCP servers to that switch or use one of the servers or workstations connected to the switch as DHCP relay.

Lutz

 

by: northcidePosted on 2003-03-25 at 05:27:36ID: 8202530

Nope, dont use much functionality of the switch atm.  I th the solution is going to be vlan.  thx all.

20120131-EE-VQP-002

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