In most cases, a branch (remote) office uses a static outside IP address to connects to a main office and we covered that in a previous post.
We configured a site-to-site IPsec VPN between two Cisco ASA firewalls with static IP address on both end, and also we covered site-to-site VPN with Dynamic IP on one end.
What if one of the remote ASA firewall at branch office is behind provider router (ADSL) and have a dynamic public IP from the ISP?
In this post I will take you through the steps to configure a PPPoE, IPsec/GRE VPN tunnel behind provider router (ADSL) with dynamic IP in the remote office.
IT mug 