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DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs (VPN headends) on the spokes, no change in the configuration on the hub is required to accept new spokes. Using this initial hub-and-spoke network, tunnels between spokes can be dynamically built on demand (dynamic-mesh) without additional ...
Most Cisco products that run IOS also have one or more "feature sets" or "packages", typically eight packages for Cisco routers and five packages for Cisco network switches. For example, Cisco IOS releases meant for use on Catalyst switches are available as "standard" versions (providing only basic IP routing), "enhanced" versions, which ...
By separating the firewall system into two separate component routers it achieves greater potential throughput by reducing the computational load of each router. As each component router of the screened subnet firewall needs to implement only one general task, each router has a less complex configuration.
Example of setting up EIGRP on a Cisco IOS router for a private network. The 0.0.15.255 wildcard in this example indicates a subnetwork with a maximum of 4094 hosts—it is the bitwise complement of the subnet mask 255.255.240.0.
A common use of CARP is the creation of a group of redundant firewalls. The virtual IP address allotted to the group of redundancy is indicated as the address of the default router on the computers behind this group of firewalls. If the main firewall breaks down or is disconnected from the network, the virtual IP address will be taken by one of ...
Here is a typical configuration: A local network uses one of the designated private IP address subnets (RFC 1918 [5]). The network has a router having both a private and a public address. The private address is used by the router for communicating with other devices in the private local network.
NetFlow is a feature that was introduced on Cisco routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination traffic, class of service, and the causes of congestion.
Firewall appliances may also offer non-firewall functionality, such as DHCP [11] [12] or VPN [13] services. Host-based firewalls are deployed directly on the host itself to control network traffic or other computing resources. [14] [15] This can be a daemon or service as a part of the operating system or an agent application for protection.