At my branch office I currently have a Cisco 1841 with ADSL WIC authenticating PPPoA with the ISP, this router also contains ACL's and a point-to-point VPN tunnel to my main office. We have been issued only one static IP address from the ISP which is assigned to the dialer interface on the 1841.
I am wanting to install a ASA 5505 in the branch office to give me greater firewall function and manage the VPN, but as the ASA 5505 only supports PPPoE and not PPPoA i was wondering if i can just use the 1841 to authenticate the PPPoA and then pass traffic thru to the ASA?? - if so would the VPN tunnel have to terminate on the 1841 still or could i assign the static IP address to the outside interface of the ASA? My ISP will not give me a second IP.
Any advice would be appreciated.