I'm in a bit of a bind and hoping for some help from somebody with a bit more networking knowledge than myself.
Background: I have a number of sites, connected to each other via IPSEC VPN's generated by the firewall at each site. Recently, one of these sites lost their ADSL modem. Murphys law dictates that it's the one geographally furthest away from me and I have a limited degree of networking knowledge at this level so I would quite like to make sure that I am planning on doing the right thing.
I am currently doing a config on a replacement set of equipment. I think what I need to do is basically as follows:-
1) Put the modem in bridge mode
2) Configure the firewall with the PPPoE User/pass obtained from the ISP and "obtain IP address from ISP automatically"
3) having done step 2, the WAN port on the firewall should be the external IP of the site, the firewall will receive all external traffic and at this point should be able to establish IPSEC VPN's to my other sites, since the modem will have stopped being an obstacle by not routing the VPN traffic.
Is that correct, or have I missed something?