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ppainterFlag for United States of America

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Cisco 1720, how to enable DHCP?

We've got a 1720, installed prior to my arrival in the company, with no documentation, set up by a non-responsive ISP, and I'm assuming DHCP is disabled.  (I'm not familiar with routers at all.  I have configured home-use style hubs that let you into config screens through a browser, however.)

IPs need to be manually configured when new computers are added, and often we have clients who want to hook up to our T1 when they're in the facility for the day.

I'm assuming that if DHCP was enabled, their hookup would go a lot more smoothly, and could possibly be even close to plug-n-play.

The facility is about half mac and half win, and there is an apple airport available for those with 802.11b, but even then , I need to get into the client's computer and assign IP, DNS, etc...

Also, I don't know if this is relevant, but the 1720 feeds into a Dell gigabit switch.



Am I thinking along the right lines to get into the 1720 and enabling DHCP in order to make temporary connection setup easier?

What, in total luser detail, do I need to do to get into the 1720 configuration mode?

And what should I do once I get there?

Avatar of pedrow
pedrow

Here's an example:
Here's an example...once you log into the router, you type 'enable' (or just 'en'). It will prompt you for your enable pw.

type conf t
and start entering commands.

The following is from a working router (mine).
Most of the commands are probably self explanatory, so you can change your addresses so they'll fit your environment.


telnet router
password:<password>

router> enable
password: <enable password>
router#
router# conf t
router(config)#

!
ip dhcp excluded-address 172.19.9.0 172.19.9.10
!
ip dhcp pool internal lan
   network 172.19.9.0 255.255.255.192
   domain-name arollo.net
   default-router 172.19.9.1
   netbios-name-server 172.19.9.5 172.19.9.6
   netbios-node-type h-node
   dns-server 172.19.9.7 206.13.28.12
   lease 0 2
!
end
wr

hope this helps.
oh...if you have any questions while entering commands, type a '?' at any point and ios will tell you what your options are.
Avatar of ppainter

ASKER

Sorry, but I'm not familiar enough with this stuff to make heads or tails of it.

Interestingly enough, when I call the ISP to walk me through it, they say that DHCP can't be done on a 1720, and that we need to buy a firewall and perhaps even a new router.  (yes, I'm quoting him exactly, and not misunderstanding what he's said.)  The ISP also holds the PW to the router, and they're being hesitant about giving it out to me... (still waiting for their callback.)

But assuming that I ever actually make it in, enabling DHCP is not as easy as clicking on a radio button...  Is there any way to dumb down that info so that I won't screw everything up?

Our network uses 192.168.100.x for local IPs  is your 172.19.9.x an internal or external IP range?

I have no idea about netbios...  there is no computer set up as a name server... should there be?

Our DNS is an external IP#...  is that a problem?

How do I gather all the current settings before I go in and break something?

ASKER CERTIFIED SOLUTION
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pedrow

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Well...  It's to be determined whether I can get it done, but you've certainly answered my questions, so Points to you.

thought i already awarded the points.....  sorry
np :) Glad to help.