Multiple IP networks

Hello All,

We have a Cisco 871 Router. I fast ethernet port is plugged into the ISPs router, the other Fast Ethernet port is in access mode with VLAN 1 configured to it.

My question is this. I have to ip addresses configured on VLAN 1(**u can only have 1 VLAN configured on the 871, all other ports act as a switchport**) secondary

I am going to have VPN traffic coming to the network but it cant go to the network becuase the other end has the same subnet!

I need to figure out how to create an access list that will allow the network and the network to talk internally to each other and have internet access, but ONLY allow the network have access to the VPN.

Can anyone give me an answer or example?

Warmest Regards,


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oh I forgot to add, the network is only accessing on the other side.
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