List of Figures

Figure 1: Applying Route Maps to Routes

Figure 2: Filtering with Access Lists

Figure 3: Filtering with AS-Path Access Lists

Figure 4: Route Map Filtering

Figure 5: Community Lists

Figure 6: NAPT Example

Figure 7: Bidirectional NAT Example

Figure 8: Twice NAT Example

Figure 9: Cross-VRF Example

Figure 10: PPTP Tunnels on an Inside Network

Figure 11: PPTP Tunnels on an Outside Network

Figure 12: IPSec Tunneling Stack

Figure 13: IPSec Tunneling Packet Encapsulation

Figure 14: IPSec Security Parameters in Relation to the Secure IP Interface

Figure 15: Customer A's Corporate Frame Relay Network

Figure 16: ISP-X Uses ERX Routers to Connect Corporate Offices over the Internet

Figure 17: Connecting Customers Who Use Similar Address Schemes

Figure 18: Using ANCP with an Access Node

Figure 19: IP Tunneling

Figure 20: Transport and Tunnel Networks Using Different Routing Protocols

Figure 21: Tunneling Through an IP Network That Fragments Packets

Figure 22: L2TP with IPSec Application

Figure 23: L2TP/IPSec Connection

Figure 24: L2TP Control Frame Encapsulated by IPSec

Figure 25: L2TP Data Frame Encapsulated by IPSec

Figure 26: L2TP Control Frame with NAT-T UDP Encapsulation

Figure 27: L2TP Data Frame with NAT-T UDP Encapsulation

Figure 28: IKE Packet with NAT-T UDP Encapsulation

Figure 29: GRE/IPSec Connection

Figure 30: Basic VRRP Configuration

Figure 31: Commonly Used VRRP Configuration

Figure 32: VRRP Configuration Without the Real Address Owner

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