Using the default-information originate Command
OSPF does not support redistribution of statically defined default routes. Instead, OSPF requires the default-information originate router subcommand, which essentially tells OSPF tore distribute any default routes found in the routing table, either static routes or routes from another routing protocol. The following list summarizes the default routing features when using the default-information originate command with OSPF: ■ Redistributes any default route (0.0.0.0/0) in ..
With ad hoc wireless LANs, there are no access points; therefore, the radio cards must send beacons. The ad hoc mode of operation transpires as follows: 1. After a user switches to ad hoc mode, the radio card begins sending beacons if one is not received within a specific period of time. 2. After receiving a beacon, each radio card waits a random period of time. 3. If a beacon is not heard from another station in this time, then the station sends a beacon. The random wait ..
Network Security Promotes Good Network Design
Although it happens far less often now, I still occasionally sit down with a customer who says, "OK, the network design is done, now we need to think about security. We're certain we need a firewall and have also heard something about IDS." Designing secure networks in this manner puts you on a fast track to a network design in which the security is tacked on, interferes with the performance of the network, and is viewed by the rest of the Information Technology (IT) staff a..
Configuring TCP/IP Header Compression over Frame Relay
This section discusses the TCP/IP header compression scheme for Frame Relay virtual circuits. TCP/IP header compression is also commonly known as the Van Jacobson's algorithm, designed and defined in RFC 1144. The TCP/IP header compression scheme relies on the redundant nature of many fields within the TCP/IP headers of a packet after a connection has been established. For the entire duration of the TCP session, the header details for the connection are maintained at both the..
Sometimes you need to connect your network to another network that uses an unregistered range, such as 172.16.0.0/16. However, if you already use this range in your network, the easiest thing to do is to simply replace this prefix with another one that doesn't have a conflict, such as 172.17.0.0/16: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ip nat outside source static network 172.16.0.0 172.17.0.0 /16 no-al..
