ISP Services

Different ISPs offer different services, depending on how big they are and the infrastructure of their networks. Mainly, providers can be categorized by their method of physical Internet access, the applications they provide to customers, and the security services they provide. The following section...

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...

IPsec Remote Access and L2L Sessions on the Same Router

Figure 18-3 shows an example network that has both remote access and L2L sessions. In this example, the remote office network is acquiring its address dynamically, via DHCP, from its connected ISP, which also is true of the remote access clients. Because the central office router doesn't know the re...

Using the Small Servers

The finger command is a simple utility that allows you to do the equivalent of a show users command on a remote router. Unix computers generally have a standard finger program that you can run as follows: Freebsd% finger @Router1 [Router1]     Line     &n...

Preventing Unwanted Neighbors Using Passive

Interfaces When an EIGRP network configuration subcommand matches an interface, EIGRP on that router does two things: Step 1. Attempts to find potential EIGRP neighbors by sending Hellos to the 224.0.0.10 multicast address Step 2. Advertises about the subnet connected to that interface In some...

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