Dynamic NAT and PAT Configuration

Like static NAT, dynamic NAT configuration begins with identifying the inside and outside interfaces. Additionally, the set of Inside Local addresses is configured with the ip nat inside global command. If you are using a pool of public Inside Global addresses, the set of addresses is defined by the ip nat pool command. Example 4-2 shows a dynamic NAT configuration based on the internetwork shown in Figure 4-7. The example defines 256 Inside Local addresses and two Inside Glo..

DECNET

DEC's proprietary networking solution was introduced in 1976. It enjoyed fairly widespread deployment and underwent three revisions, which added scalability and host support as well as SNA gatewaying. This culminated in the release of DEC Network Architecture Phase IV (DNA IV) in 1982. DNA IV features a well-organized network-addressing hierarchy and a peer-to-peer networking philosophy similar in many ways to IP. Indeed, many of the large U.S. federal networks (notably ESNet..

Enabling Local Router Logging

Use the logging buffered configuration command to enable the local storage of router log messages: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#logging buffered informational Router(config)#end Router# This feature causes the router to store all log messages to a revolving buffer called the logging buffer. Many network administrators find it convenient and useful to keep detailed router logs on the router itself..

Setting Up Frame Relay with Map Statements

In its simplest form, the Frame Relay map configuration involves considerably less typing than the subinterface version of the same configuration: Central#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Central(config)#interface Serial0 Central(config)#description Frame Relay to branches Central(config-if)#ip address 192.168.1.1 255.255.255.0 Central(config-if)#encapsulation frame-relay Central(config-if)#frame-relay map ip 192.168.1.10 ..

Controlling Multicast Scope with TTL

You can define a TTL threshold value for each interface on a router. The ttl-threshold command instructs the router to drop any multicast packets that have a TTL value less than or equal to the specified value. The router will receive packets on this interface normally. This command only affects transmission of multicast packets: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ip multicast-routing Router1(confi..