Cisco SRP521W-K9-G1 Administration Guide - Page 32

Setting up the Interfaces of the Services Ready Platforms Setting up the WAN Interface 4 Ethernet WAN Interface Settings Field Description L2TP Select this option if your ISP uses L2TP (Layer 2 Tunneling Protocol) and has provided you with a static IP address. Enter the L2TP Server IP address and the User Name and Password for your account. If your service provider does not dynamically assign an IP address, disable DHCP and enter the address, mask and gateway details provided for your account. Select either the Connect on Demand or Keep Alive option. Maximum Transmission Unit (MTU) Size, in bytes, of the largest packet that can be sent through the network. This value is typically1500 bytes but might need to be lower for some broadband services. Check with your service provider for specific requirements. Static DNS 1-3 (Optional) Enter the IP addresses of up to three Domain Name System (DNS) servers, or leave the fields blank to allow a DNS server to be assigned dynamically. Encapsulation Settings This section describes the ADSL Encapsulation Settings that you can choose from in the Internet Setup page under VC settings. Encapsulation is the protocol used between your broadband gateway and your ISP's servers. Most of the encapsulations are defined in Internet standards called Requests for Comments (RFCs). Two are derived from the Point-to-Point Protocol (PPP): PPP over Ethernet (PPPoE) and PPP over ATM (PPPoA). IPoA Settings Choose IPoA for direct encapsulation of IP traffic over the DSL ATM virtual circuit. Enter the required information as provided by your ISP: Internet IP Address, Subnet Mask, and Default Gateway IP address. Optionally, you can enter the IP addresses of the primary and secondary DNS servers. Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models) 32