Site to Site VPN behind router (ADSL)

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.

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Cisco PIX/ASA Site-to-Site IPsec VPN Configuration

The Site-to-Site IPsec VPNs were used to connect two distant LANs together over the Internet. Private addresses were used on the LAN that means without tunneling the two LANs would be unable to communicate with each other.

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