Aggregatable Global Unicast Addresses

IPv6 defines several different types of unicast addresses. The format used for publicly registered addresses is called aggregatable global unicast. The term aggregatable refers to fact that these addresses can be easily aggregated to reduce the problem of large Internet routing tables. The term glob...

Single-Rate, Three-Color Policer (Two Buckets)

When you want the policer to police at a particular rate, but to also support a Be, the policer uses two token buckets. It also uses all three categories for packets

IPsec Modes of Operation and Security Options

IPsec has many protocol options. This section provides a brief look at the main elements. One concept that's important to understand for IPsec is the concept of security associations, or SAs. An SA is simply a connection that provides security services to the traffic carried by it. When you use IPse...

Virtual Private Dial-Up Networks (VPDN)

A VPDN is a network that extends remote access dialup clients to a private network. VPDN tunnels use either Layer 2 forwarding (L2F) or Layer 2 Tunnel Protocol (L2TP). Cisco introduced L2F in RFC 2341. It is also used to forward PPP sessions for Multichassis Multilink PPP. L2TP, introduced in ...

Configuring DHCP for IPv6

Just as you can configure a router to act as a DHCP server for IPv4 addresses, Cisco's IOS also includes an IPv6 DHCP server function: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ipv6 dhcp database flash:/DHCPv6-db Router1(config...

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