C-12 User’s Reference Guide

Routers B and C (which could also be Netopia R2121s) serve the two remote networks that are subnets of a.b.c.0. The subnetting is accomplished by configuring the Netopia R2121 with connection profiles for Routers B and C (see the following table).

Connection profile

Remote IP address

Remote IP mask

Bits available for host

address

 

 

 

 

 

 

 

 

 

 

 

for Router B

a.b.c.128

255.255.255.192

7

 

 

 

 

for Router C

a.b.c.248

255.255.255.248

3

 

 

 

 

The Netopia R2121’s connection profiles for Routers B and C create entries in its IP routing table. One entry points to the subnet a.b.c.128, while a second entry points to the subnet a.b.c.248. The IP routing table might look similar to the following:

 

 

IP Routing Table

 

 

Network Address-Subnet Mask-----

via Router------

Port--Age--------

Type------

----------------------------------

SCROLL UP--------------------------------

 

0.0.0.0

0.0.0.0

a.b.c.1 WAN

3719

Management

127.0.0.1

255.255.255.255 127.0.0.1 lp1

6423

Local

a.b.c.128

255.255.255.192 a.b.c.128 WAN

5157

Local

a.b.c.248

255.255.255.248 a.b.c.248 WAN

6205

Local

---------------------------------SCROLL DOWN-------------------------------

UPDATE

Let’s see how a packet from the Internet gets routed to the host with IP address a.b.c.249, which is served by Router C. The packet first arrives at Router A, which delivers it to its local network (a.b.c.0). The packet is then received by the Netopia R2121, which examines its destination IP address.

The Netopia R2121 compares the packet’s destination IP address with the routes in its IP routing table. It begins with the route at the bottom of the list and works up until there’s a match or the route to the default gateway is reached.

When a.b.c.249 is masked by the first route’s subnet mask, it yields a.b.c.248, which matches the network address in the route. The Netopia R2121 uses the connection profile associated with the route to connect to Router C, and then forwards the packet. Router C delivers the packet to the host on its local network.

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Netopia R2121 manual Management
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R2121 specifications

The Netopia R2121 is a powerful and versatile router designed for both home and office environments, providing seamless connectivity and robust performance for various networking needs. This device offers a range of features and technologies that cater to the demands of modern users seeking reliable internet access, speed, and security.

One of the standout characteristics of the Netopia R2121 is its dual-band technology, which operates on both the 2.4 GHz and 5 GHz frequency bands. This capability allows users to enjoy faster speeds and less interference, as the 5 GHz band is typically less congested than the traditional 2.4 GHz band. With the ability to support multiple devices simultaneously, the R2121 ensures that users can stream videos, play online games, and conduct video conferences without experiencing lag or connectivity issues.

The router is equipped with advanced security features, including WPA3 encryption, which provides enhanced protection against unauthorized access and data breaches. The R2121 also supports a robust firewall system that guards against external threats, ensuring that the user's network remains secure. Additionally, the router includes parental controls, allowing users to manage and restrict internet access for specific devices or set time limits for usage, making it an excellent choice for families.

Another significant advantage of the Netopia R2121 is its extensive coverage area. With high-gain antennas and advanced beamforming technology, the router can deliver strong and stable Wi-Fi signals even in larger homes or office spaces. This technology focuses the Wi-Fi signal directly toward connected devices, minimizing dead zones and improving overall connectivity.

The R2121 also supports both IPv4 and IPv6, ensuring compatibility with current and future internet technologies. This forward-thinking design makes it a future-proof solution for users looking to invest in a reliable router.

In terms of setup and management, the Netopia R2121 features a user-friendly web interface that allows users to easily customize settings, monitor network performance, and manage connected devices. The inclusion of mobile app support further enhances the user experience, enabling remote monitoring and control of the network from anywhere.

Overall, the Netopia R2121 stands out as a robust and reliable router that combines advanced features, enhanced security, and excellent performance, making it an ideal choice for home and business users alike. With its focus on delivering seamless connectivity and comprehensive management options, the R2121 is well-suited for today's connected lifestyles.
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