By Paul Ammann

THE troubleshooting advisor to advanced IP networks.

want speedy strategies to community outages and different thorny TCP/IP difficulties? dealing with Dynamic IP Networks, by means of Paul T. Amman, delivers a high-quality clutch of day by day administration and operation of IP-based networks utilizing DHCP and Dynamic listing community companies (DNS) within the home windows, UNIX, and IBM AIX server environments. this convenient handbook emphasizes most economical distant administration and dynamic setup, offering real-world examples of DHCP and DDNS applied sciences utilized to roaming clients, clever net looking, software program distribution, printing, PPP dial-up and different community needs.

convey your self in control on integrating dossier and Print services...growing your network..tackling safeguard, reliability, and function issues...selecting DHCP concepts and developing DHCP boot diskettes...resolving program issues...and comparing such high-end applied sciences as community TeleSystems' Shadow IP server, IBM Communications Server, and UNIX platforms.

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NoteIf you configure routers on the network to forward DHCP and BOOTP messages (using BOOTP/DHCP relay agent capabilities), the broadcast message is forwarded to DHCP servers on the attached networks. Each DHCP server that receives the client’s DHCPDISCOVER message can send a DHCPOFFER message to the client, offering an IP address. If the address has not been previously assigned, the DHCP server checks that the address is not already in use on the network before issuing an offer. The server checks the configuration file to see if it needs to assign a static or dynamic address to this client.

Machines left on overnight will retain their addresses, but all others will get new assignments each day. In this way, address conservation will occur naturally when employees don’t come to work on a given day. In addition, every day the environment can be changed, since DHCP is performed at bootup. Even machines left on overnight will get new environmental information within a day. If the server crashes in this type of system, administrators have only one night to get it back up before clients start failing.

Some DHCP options are now unnecessary. Default routers, for example, are now obtained by a client using IPv6 neighbor discovery. •DHCP messages (including address allocations) appear in IPv6 message extensions, rather than in the IP header as in IPv4. •There is no requirement for BOOTP compatibility. •There is a new reconfigure message, which is used by the server to send configuration changes to clients (for example, the reduction in an address lifetime). Clients must continue to listen for reconfigure messages once they have received their initial configuration.

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