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Cisco 800 Series Router DHCP

Posted on 2011-09-13
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Last Modified: 2012-05-12
Hi,

I have a number of Cisco 800 series ADSL routers that I would like to issue out IP addressess for the LAN that they are on, we currently issue static addressess to any clients that connect to the LAN, but this causes a problem when we have visitors from other offices when they try and plug into the network.

Can anybody tell me (and Im sure its simple for a Cisco guy or girl) the commands, I'll be doing this from a telnet session as the routers are stripped down before being deployed.
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Question by:cabland
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11 Comments
 
LVL 10

Assisted Solution

by:SuperTaco
SuperTaco earned 200 total points
ID: 36529887
it's fairly easy.  You configure NAT (if you haven't already) then configure an Address poll, then enable.  Here's a link to a great set of instructions I use for reference.  

http://www.techrepublic.com/article/configure-dhcp-on-a-cisco-router-or-switch/5690240

If you are using SDM or CCP, you can do it through the GUI too.  You may have the web intfercae enable by default.  if that's eh case, try enabling DHCP through that first, it's a good bit easier for people who aren't very familiar with the command structure.  you can enable the web interface by using the ip http server command

router# ip http server
router# ip http server  "internal ip range and subnet"
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LVL 35

Accepted Solution

by:
Ernie Beek earned 300 total points
ID: 36529910
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LVL 35

Expert Comment

by:Ernie Beek
ID: 36529925
Darn, it's too slow typing on a onscreen keyboard :-~
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Author Comment

by:cabland
ID: 36530033
thanks for the rapid repsonse both, I've followed the advise and now have then entry in my config

ip dhcp excluded-address 10.30.30.1 10.30.30.200
!
ip dhcp pool scope
   network 10.30.0.0 255.255.0.0
   dns-server 200.100.10.14
   default-router 10.30.0.254
   domain-name TKSERVICES
   lease infinite
!

Basically what I am looking to do is give out an address in the range 10.30.30.201-254 (my exclusion isnt quite right but I can change that).

how do I set the subnet mask to be 255.255.0.0 as my local site router is on the address 10.30.0.254?
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LVL 10

Expert Comment

by:SuperTaco
ID: 36530071
It look like it should be pushing that out,  with your config.  is it not?
0
 

Author Comment

by:cabland
ID: 36530096
to be honest Ive not tried it yet, I've just put the config onto a test router.

Looking at my config am I likely to have the address 10.30.0.1 with a subnet 255.255.0.0 issued?  I cant see anywhere (like with a Windows DHCp scope) where you can enter the range
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LVL 35

Expert Comment

by:Ernie Beek
ID: 36530100
Try:
ip dhcp pool scope
network 10.30.0.0 /16
0
 

Author Comment

by:cabland
ID: 36530544
Hi Both, as super taco was first with the fix I'm awarding the points that way.
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LVL 35

Assisted Solution

by:Ernie Beek
Ernie Beek earned 300 total points
ID: 36530967
There's always the option to split ;)
0
 

Author Closing Comment

by:cabland
ID: 36532038
Excellent, had to make a few tweaks to get the range that I was loking for.  Thanks guys
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LVL 35

Expert Comment

by:Ernie Beek
ID: 36532722
You're welcome :)
Thx for the points.
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