Heritage Series ADSL Bridge/ Router

9-3

DHCP Client Configuration

arrives. By default, the select-timeout is zero seconds - that is, the client will take the first offer it sees.

9.1.4 Reboot

reboot time;

When the client is restarted, it first tries to reacquire the last address it had. This is called the INIT-REBOOTstate. If it is still attached to the same network it was attached to when it last ran, this is the quickest way to get started. The reboot statement sets the time that must elapse after the client first tries to reacquire its old address before it gives up and tries to discover a new address. By default, the reboot timeout is ten seconds.

9.1.5 Backoff-cutoff

backoff-cutoff time;

The client uses an exponential backoff algorithm with some randomness, so that if many clients try to configure themselves at the same time, they will not make their requests in lockstep.

The backoff-cutoffstatement determines the maximum amount of time that the client is allowed to back off. The backoff-cutoff time defaults to two minutes.

9.1.6 Initial-interval

initial-interval time;

The initial-intervalstatement sets the amount of time between the first attempt to reach a server and the second attempt to reach a server. Each time a message is sent, the interval between messages is incremented by twice the current interval multiplied by a random number between zero and one. If it is greater than the backoff-cutoff amount, it is set to that amount. The initial interval time defaults to ten seconds.

9.2 Lease requirements and requests

The DHCP protocol allows the client to request that the server send it specific information, and not send it other information that it is not prepared to accept. The protocol also allows the client to reject offers from servers if they do not contain information the client needs, or if the information provided is not satisfactory.

There is a variety of data contained in offers that DHCP servers send to DHCP clients. The data that can be specifically requested are called DHCP

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IBM Heritage user manual Reboot, Backoff-cutoff, Initial-interval, Lease requirements and requests
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Heritage specifications

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