IPv6-to-IPv4 (6-to-4) Tunnels

A 6-to-4 tunnel works similarly to a manual tunnel, except that the tunnel is set up automatically. 6-to-4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32- bit IPv4 address of the edge router, creating a 48-bit prefix.  An example of 6-to-4 tunneling is shown in Figure 21-...

Troubleshooting EIGRP Neighbor Relationships

This section discusses methods of troubleshooting issues regarding EIGRP neighbor relationships. The following are the most common causes of problems with EIGRP neighbor relationships: ? Unidirectional link ? Uncommon subnet, primary, and secondary address mismatch ? Mismatche...

Easy VPN Remote

Besides supporting the Easy VPN Server function, certain routers also can be Easy VPN Remotes. These routers include the 800, ubr900, and 1700 series routers. This was introduced in IOS 12.2(4)YA and 12.2(13)T. As you saw in the last section, setting up an Easy VPN Server on a router from the CLI is...

Enabling HTTP Access to a Router

After configuring this feature on a router, you can then connect to the router from a standard web browser. For example, using the Lynx text-based web browser, the router's home page looks like this:                 &...

Providing a Backup to Frame Relay Virtual Circuits

Using secondary connections to back up the main Frame Relay virtual circuits allows organizations to continue their business operations by ensuring network connectivity in the event of failures to the primary connections. Provisioning a secondary backup connection to the primary Frame Relay virtual...

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