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Cisco 1921 ISR WAN Config

My first post so bear with me!

Background:

We have a satellite office connected to our network via a PTP dedicated private connection.  At this time, there is no router on either end of the connection and the users in the satellite office appear as local users with the same IP address range as the head office users.  This means that all internet traffic generated by the satellite users is coming across the PTP connection and going out from head office.  In order to ease the load on the PTP connection I would like to put a Cisco 1921 that I have in the satellite location to re-direct their internet traffic to a local provider, but still allow seamless connectivity to the head office resources as needed.

Question(s):

The Cisco 1921 has two gigabit ports Ge0 and Ge1 (IPBase) and, based on my limited router knowledge, I need three (3) ports to make this work as envisioned.  So, in order to do this I need an additional Ge port, correct?
Do I need to change the IOS image from IPBase to another level?

Thank you for your kind responses
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Dan Mark
Asked:
Dan Mark
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3 Solutions
 
Ernie BeekCommented:
Your first post, so welcome :)

Let's see, you don't really need three interfaces you could do with some routing.
If you use a DHCP server, set the new internet router as the default gateway for the network. Then, set an additional route for the remote office range through the ip of the PTP device. I am assuming here that the device has an ip (?)
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unfragmentedCommented:
Hi dannobot.

To answer your questions:-
1.  Yes you need three ports.  Does the 3rd port need to be gigabit?  A 100Mb hwic is much cheaper than a 1Gb hwic + SFP, and not too many people have a 1Gb internet connection!
2.  The c1921 ISR uses a universal IOS image.  If you are connecting to an ISP you will want the security license.

A couple of things to bear in mind:-
1.  Even though it has Gb ports, the 1921 won't route at the full line rate.
2.  A c2911 ISR has 3 gig ports built-in, higher performance, and voice support - might be worth the extra initial cost.
3.  Get the rack mount kit with the 1921 if you plan to rack it.

Hope that helps!
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SanjeevlokeCommented:
what I understood .

      Satellite office -g0/0---1921--g0/1----------P2P---------HO Office
                                           |
                                           |
                                         g0/2
                                Local Internet link
Only a card is needed at router ,IOS will be enough but have to check which card u opt to purchase.
on 1921 ; ip route 0.0.0.0 0.0.0.0 g0/2 name Internet-link
                ip route 192.168.0.0 255.255.0.0 g0/1 name HO subnet
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Dan MarkAuthor Commented:
Thanks to all for your comments and suggestions

We already have the 1921 and the PTP connection is limited to 10MB anyway.  The PTP is completely transparent on our network in that the current GW IP for the users in the satellite office is actually on the Head Office network.

So if I have this right, I need an additional card in the 1921 (a 100MB HWIC should do - thanks unfragmented) and I would configure it to look like the following:

SO (192.168.2.x/24) ------> g0/0 (192.168.2.254) -- 1921 <------> g0/1 (10.10.10.254) -- HO
                                                                                |
                                                                                |
                                                                g0/2 (192.168.3.254/24)
                                                                                |
                                                                                |
                                                    Cable Modem to Internet (192.168.3.1/24)

The Satellite Office users would have 192.168.2.254 as their GW IP and I would need to add the following to the 1921:

ip route 0.0.0.0 0.0.0.0 g0/2 name Internet
ip route 10.10.0.0 255.255.0.0 name Head Office

Does this make sense?  Thanks for your support
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Ernie BeekCommented:
Not quite, the ptp is then added to the router through the 3rd interface so the router stays the default gateway without the need of adding an extra route. The routing to internet/remote office will be done in the router.
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Ernie BeekCommented:
Ok, need a pair of glasses......

Seems you're right :)
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Dan MarkAuthor Commented:
One small typo:

ip route 10.10.0.0 255.255.0.0 g0/1 name Head Office

So this is all there is to it?
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SanjeevlokeCommented:
yes correct ...
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Dan MarkAuthor Commented:
Thanks to all for your help - you all had a little part in the solution
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