I have a business internet connection terminating at an ADSL NTU onsite installed for a client - the unit is fully managed without NAT or firewalling and we need to plug a Cisco 877 into it to route traffic to the rest of the internal small business network. We have from the ISP the static IP of the service (119.225.221.x), subnet (255.255.255.252), gateway (22.214.171.124) and DNS servers
I'd like to configure the eth0 port to assign itself the service public IP address (while plugged into the Optus NTU) and then do NAT, DHCP, DNS to the rest of the network as usual on the other three ports.
Essentially what I am trying to do is to setup a Cisco 877 ADSL router as a Cisco 871 Ethernet based router. (i.e. not using the ADSL port, and using one of the switch ports as a WAN port)
My Cisco skills aren't quite up to the task... I'm sure this is a simple one.
I've tried setting up an additional VLAN and configuring the eth0 port with the static IP (through the SDM wizard) but I'm getting an error saying the unit has reached it's maximum number of VLANs (I thought these supported 4). I believe this is a limitation of the SDM version I am using
Anyone able to help with some config code I can put into the config for the interface?