Using the ip default-network Command

RIP and EIGRP can inject default routes by using the ip default-network command. To do so, the following must be true on the local router: ■ The local router must configure the ip default-network net-number command, with net number being a classful network number. ■ The classful network must be in the local router’s IP routing table, via any means. ■ For EIGRP only, the classful network must be advertised by the local router into EIGRP, again through any means. ..

Multicast Addresses for GLOP Addressing

IANA has reserved the range 233.0.0.0 through 233.255.255.255 (RFC 2770), called GLOP addressing, on an experimental basis. It can be used by anyone who owns a registered autonomous system number (ASN) to create 256 global multicast addresses that can be owned and used by the entity. IANA reserves addresses to ensure global uniqueness of addresses; for similar reasons, each autonomous system should be using an assigned unique ASN. By using a value of 233 for the first octet,..

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 Frame Relay RTP Header Compression

RTP, defined in RFC 1889, is designed specifically for transporting audio and video traffic in packets over an IP-based network. RTP provides end-to-end transport for applications that support audio, video, multicast, or unicast network services. The RTP protocol format includes both header and data portions. The data portion of RTP provides support for real-time applications, such as continuous media streaming, loss detection, timing reconstruction, and content identificati..

Influencing the Choice of Best Route for Summary Routes

Often, engineers plan route summarization for the same address block on multiple routers. Such a design takes advantage of redundancy and can be used to perform basic load balancing of traffic across the various paths through the internetwork. Figure 1-2 shows one such example, with Routers WAN1 and WAN2 summarizing routes for the two address blocks located on the branch office LANs: 10.11.0.0/16 and 10.12.0.0/16. Figure 1-1 Figure 1-2 Choosing Locations for Route Summa..