Hardware Installation Guide
Page 114
... WIC With IP Unnumbered E0, PPPoA, PPP-PAP, and Manually Configured Local LAN Devices - Configuring a Cisco 1700/2600/3600 ADSL WIC With IRB and NAT Using RFC1483 Bridging - Configuring IPSec Over ADSL on page 19. Configuring a Cisco 1700/2600/3600 ADSL WIC With IP Unnumbered E0, DHCP, PPPoA, and PPP-PAP - Feature Modules...
... WIC With IP Unnumbered E0, PPPoA, PPP-PAP, and Manually Configured Local LAN Devices - Configuring a Cisco 1700/2600/3600 ADSL WIC With IRB and NAT Using RFC1483 Bridging - Configuring IPSec Over ADSL on page 19. Configuring a Cisco 1700/2600/3600 ADSL WIC With IP Unnumbered E0, DHCP, PPPoA, and PPP-PAP - Feature Modules...