Cisco 2621 - Simple Routing Setup, Newbie Help

[mlager]

I'm moving into a new data center. I don't consider myself a network engineer or anything but I do understand the basics. The new data center I am moving into routes my network to me a bit differently than my old data center, so I thought I'd post here and ask for some help.

The IOS on the Cisco 2621 is: c2600-i-mz.123-26.bin

I am assigned a /29 block which they configure as the routing network, it looks like this:

Routing Network: A.A.A.0
Routing Network Subnet Mask: 255.255.255.248
Routing Network Def Gateway: A.A.A.1
Customer Usable Address: A.A.A.4

I've been assigned a /28 block which is B.B.B.240/28. They stated that in order for me to use my allocated blocks, I had to act as my own gateway, routing the traffic through the routing network. This goes just a bit beyond my networking knowledge, though I still understand it, I just don't know exactly how to execute. I'm assuming my 2621 with 2 FastEthernet interfaces should be able to handle this routing scenario.

I was wonder if anyone could offer up some sample configs, or possible a link to a howto to get this setup? I was going to use FreeBSD to do the routing, but a appliance based Cisco router is much more attractive of an option to me.

Thanks for any advice.

 

[SweetRevelation]

You would assign the address they give you with the /29 to one port on your cisco router, call it the ISP side. Then you would assign your /28 block to your other port on your cisco router, call it office side or whatever.

On the /29 side they are telling you the IP to assign, on the /28 side you pick an IP from your block(you'd normally use the first one) and assign it to your router. You'd put a static route in the router pointing to the ISP Side default gateway.

Say ip route 0.0.0.0 0.0.0.0 A.A.A.1

Then if you had a firewall you'd assign it another address in the /28 and point it's default route to the IP of the office side of your router.

Let me know if that makes sense, it's a pretty easy setup so you shouldn't have any issues.

 

[mlager]

Great thanks for the help, it does sound pretty simple. Appreciate your quick response!