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Cisco 891 Router DHCP

Posted on 2013-06-17
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Last Modified: 2013-06-17
I am getting ready to install a cisco 891 router into our network.

It will be running as a router on a stick for 3 separate /24  networks.  Will it be possible for this router to handle DHCP for 1 of the networks, but still have our MS Server boxes handle DHCP for the other 2 networks?

 I have some experience with the Cisco IOS, but wasn't sure how the DHCP would work with the separate networks and router on a stick.


Thanks!
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Question by:schmity78
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Expert Comment

by:Teeshirt
ID: 39254129
I guess you are you using VLANs for the 3 different /24s.

It should be able to handle DHCP for 1 of the networks, if you are using a manageable switch, just make sure you set an ip helper for that specific VLAN.
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by:schmity78
ID: 39254199
Yes, I am also purchasing some cisco 2960 switches and will be using VLANS for the 3 networks.

Give each vlan/network an ip helper for its respective DHCP server or just for the network the router will be handling DHCP for?

thanks!
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by:Teeshirt
ID: 39254213
Depends.. Its best to assign each VLAN it's ip helper address since you're going to use a 2960 :-)

Interface VLANxxxx
ip helper address xxx.xxx.xxx.xxx
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Teeshirt earned 500 total points
ID: 39254221
Interface VLANxxxx
ip helper address xxx.xxx.xxx.xxx - - - > ip of cisco router running dhcp

Interface VLANyyyy
ip helper address xxx.xxx.xxx.xxx - - -> ip of win server running dhcp

Interface VLANzzz
ip helper address xxx.xxx.xxx.xxx - - -> ip of win server running dhcp
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Author Closing Comment

by:schmity78
ID: 39254229
Awesome, thanks!
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