I have a Cisco 1841 router with an HWIC-ADSL module installed. My ADSL connection is PPPoA with a dialer interface and I have been provided 6 ip's from my provider to use on this service.
Previously I have connected Fa0/0 on the 1841 straight onto my network and used NAT and ACL's on the 1841, I would now like to change this and have Fa0/0 connected to a Palo Alto firewall and use the Palo Alto to provide NAT, Firewall & site to site VPN functions. What config would I require on the 1841 to allow me to use one of my ISP IP addresses on the Palo Alto to allow it to be a VPN endpoint? Do I need to configure the 1841 in bridge mode?
Thanks for your response. I realise it could be done using simple routing using the method you suggested but this does'nt not allow me to use one of the ISP allocated IP addresses on the interface of my firewall that is behind the 1841. It would also then require NAT to be configured on the 1841 for the VPN connection, this something I do not wish to do.
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