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Cisco 1841 router config assistance

Hello EE. I was hoping to get some advice on configuring my Cisco 1841 router. Here is the situation. We have a site that moved. They split between three different locations. They want to link the phones together to use the phone system at the main location. The phone provider wants to add a router at the main site  to link up the  phones. I have one spare Fastethernet  port on the 1841 router at the main site. The serial interface is connecting to the Internet and one of the Fastethernet ports connect to the inside network. How to configure the spare port to talk to their router and route traffic? I attached a map and the IP info for the site and the existing router config. Thanks.


Map.jpg
Router-Config1.txt
IP-Info1.txt
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InSearchOf
Asked:
InSearchOf
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2 Solutions
 
emilgasCommented:
You can either use a subinterfacing where your physical interface gets changed into however many logical interfaces like FE 0/0.1 0/0.2 and so on.

but ultimately you want to have a Cisco's Next level up Router which has 4 WIC interfaces where you can add more Fast Ethernet Ports.
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SouljaCommented:
I guess the missing denominator is how will the phone provider's router be configured?
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InSearchOfAuthor Commented:
The phone provider wants to use one of our available public lan IPs. When I try to configure the unused Lan interface for subinterfaces it gives me an error about vlan:
% Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,
or ISL vLAN.
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SouljaCommented:
It's giving this error because it is expecting you to use the subinterface for vlan routing. Thus, you have to enable an encapsulation protocol.

i.e., encapsulation dot1q x

x being the vlan number.
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SouljaCommented:
What functionality will your phone provider's router be providing that your router won't be able to provide? e.g., connecting the phone switch directly to your router.
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InSearchOfAuthor Commented:
Well, he is linking 2 remote sites which are part of our organization. He has routers at both of those locations to connect to the router he has installed at the main location. They are connecting though a vpn tunnel. He wants to make use of one of our unused lan public IPs at the main location for his router there as shown on the map I attached to this post.
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InSearchOfAuthor Commented:
This is to save the cost of phone systems and licenses at those locations which only have a few users and are located fairly close to the main location.
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InSearchOfAuthor Commented:
Can I just assign my first usable ip to my unused router port and assign the oher device the second usable ip and have the other device use my interface with the first usable ip as its gateway and use an access list and ip route command to route traffic?
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SouljaCommented:
Yes, that is exactly what I was going to suggest. Just assign an usable ip to your interface and the other ip to the provider's router ip. Since they will be on the same broadcast domain, you can just have the provider put a static router to your ip address, and you put on to router to whatever the network is that he will have behind that router.
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InSearchOfAuthor Commented:
Great. Thank for the info
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