"This memo explores the requirements for host configuration in IPsec tunnel mode@ and describes how the Dynamic Host Configuration Protocol (DHCPv4) may be leveraged for configuration. In many remote access scenarios@ a mechanism for making the remote host appear to be present on the local corporate network is quite useful. This may be accomplished by assigning the host a ""virtual"" address from the corporate network@ and then tunneling traffic via IPsec from the host's ISP-assigned address to the corporate security gateway. In IPv4@ DHCP provides for such remote host configuration."