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Conti vity 251 ABOT D eployment
1. Make sure that the C251 is reset to factory default.
2. Change C251 VPI/VCI to the number provided by ISP, and test DSL connecton.
3. Change the C251 LAN with planned IP address and subnet.
4. Configure the C251 with:
One client tunnel (inactive).
One BO tunnel (active).
5. Test the configuration to ensure that both ABOT and Client tunnels are able to be
established.
6. Save the configuration file to local computer disk with a unique file name. Suggest that
the file name is bound with BO location.
7. Repeat the above procedures for each C251 and remote site.
2.11 C251 Factory Defaults and minimum changes
The C251 is shipped with a default factory configuration, and the default parameters work with
the majority of ADSL ISP installations, but they may require minimum changes for working with
some ISPs.
With the default configuration, C251's DHCP server on its private interface is enabled and the
address ranges from 192.168.1.3 to 192.168.1.254/24. The C251 has a default management
interface address of 192.168.1.1/24 with a default password of "setup". PCs connecting to the
C251 private interface will be assigned an IP address in the same subnet if they have dynamic
addressing configured.
The factory default configuration has the DHCP client enabled on the public interface. When
connecting to an ISP, a dynamic public IP address will be assigned by ISP. This default
configuration allows end users to access to the Internet in a plug and play fashion.
The C251 hard client is designed as a 3DES client, and uses 3DES/SHA to connect to the CO
Contivity user group. This method is the most secure algorithm of SA offered in this release.
The C251 has a default WAN setting as following. The WAN default setting works with most
ADSL ISP providers. The VPI/VCI number may slightly differ from providers.
•
Routing mode
•
LLC multiplex
•
ENET ENCAP encapsulation
•
VPI/VCI as 8/35
R outing mode
U
Routing mode is the default setting, and should always be used for building VPN network
regardless who is your ISP. Selecting "bridge mode" may allow you to access to Internet, but not
allow you to establish VPN connection to Contivity gateway.
E NET ENCAP Encapsulation
U
Be sure to use the encapsulation method compatible with your ISP.
The C251 supports various encapsulation methods, and the default mode of "ENET ENCAP" will
work with almost all the ISP providers. "ENET ENCAP" method is the MAC Encapsulated Routing
Link Protocol implemented with the IP network protocol. IP packets are routed between the
Ethernet interface and the WAN interface and then formatted so that they can be understood in a
bridged environment. For instance, it encapsulates routed Ethernet frames into bridged ATM
cells. ENET ENCAP requires that you specify a gateway IP address in the Ethernet
Encapsulation Gateway field.
Version 1.0
April 26, 2004
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