The Cisco VPN Client for Windows supports two interfaces: CLI and GUI. This book will focus on the GUI interface of the 4.6 client. Once you have installed the client, go to Start > Programs > Cisco VPN Software Client > VPN Client to access the GUI. Sometimes the application is referred to as the "VPN Dialer," after the older 3.x application name. Operating Modes The VPN Client has two operating modes: • Simple Mode, shown in Figure 12-1 Figu..
To configure PPP over Frame Relay, you need to associate the DLCI with a Virtual Template, which will carry the Layer 3 information. Because PPP fundamentally involves a single connection between two devices, it is most natural to use this feature on point-to-point subinterfaces: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Loopback1 Router1(config-if)#ip address 10.1.200.5 255.255.255.252 Router1(con..
The router will keep NAT entries in the translation table for a configurable length of time. For TCP connections, the default timeout period is 86,400 seconds, or 24 hours. Because UDP is not connection based, the default timeout period is much shorteronly 300 seconds, or 5 minutes. The router will remove translation table entries for DNS queries after only 60 seconds. You can adjust these parameters using the ip nat translation command, which accepts arguments in seconds: ..
Enabling Frame Relay Encapsulation
On a Cisco router, Frame Relay can be configured only on the supported interfaces; it's most commonly supported on synchronous serial interfaces. A single Cisco IOS command is all that is required to enable Frame Relay on the serial interface. The encapsulation frame-relay interface configuration command, as follows, is used to enable Frame Relay encapsulation and to allow Frame Relay processing on the supported interface. R1(config)#interface serial4/2 R1(config-if)#encapsu..
The Origins of Frame Relay: X.25
v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Frame Relay has its roots in the X.25 protocol, a robust packet-switched WAN protocol widely deployed in the early 1970s to connect geographically dispersed LANs and WANs. The X.25 protocol works well on noisy transmission mediums, which observe a high rate of errors and packet drops. X.25's windowing, flow, and error control fe..
