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Cisco 2801 w/ 3 Interfaces

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by susu

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I have a Cisco 2801 with an HWIC-4ESW installed in slot 1.
I have an internal network, an Internet connection and a seperate LAN connection that will go to another building. The two LAN interfaces will plug into switches and the Internet interface will go to a router provided by the ISP.
So far, I have been able to get interface F0/0 to connect to the Internet and interface F0/1 to be the internal interface. I'm trying to get the HWIC to be the interface to the other building but I can't figure out how. When I add the HWIC, I get four new sub-interfaces off F0/1 (F0/1/0, F0/1/1, etc) and a new Vlan1 interface.
Am I going about this correctly? Can I accomplish my goals with the hardware I have? If so, how?

7 replies

by kryptos

the HWIC-4ESW is a 4 port swicth module, you won't be able to assaign ip for this interfaces directly.
You probably need to configure VLANs and use the inter-VLAN rouitng feature to achive your goal.

by susu

That's my question. If I need to configure VLANs, how do I do that? I don't know the first thing about VLANs.

by kryptos

Create 2 VLANs. Assign IP for both VLANs, for first VLAN IP from internal LAN range & for second VLAN assign a IP from other LAN you have. Assign switch interface to respective VLANs. Add routing for all the subnets as you normally do it router.

thx,

by susu

I learned in elementary school that the definition of a word can't contain the word being defined. Similarly, the answer to "how do I configure VLANs?" cannot be "Create 2 VLANs".

Regardles, I found the answer at experts-exchange.com.

by kryptos

Create 2 VLANs. Assign IP for both VLANs, for first VLAN IP from internal LAN range & for second VLAN assign a IP from other LAN you have. Assign switch interface to respective VLANs. Add routing for all the subnets as you normally do it router.

thx,

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