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Specifying DHCP Lease Times

For clients that do not request a specific lease time, the default lease time is one day. You can configure a maximum lease time for IP address assignments or change the default lease time.

To configure lease times, include the maximum-lease-time and default-lease-time statements:




maximum-lease-time;

default-lease-time;

You can include these statements at the following hierarchy levels:



[edit system services dhcp]
[edit system services dhcp pool]
[edit system services dhcp static-binding]

Lease times defined for static bindings and address pools take priority over lease times defined at the [edit system services dhcp] hierarchy level.

The maximum-lease-time statement configures the maximum length of time in seconds for which a client can request and hold a lease. If a client requests a lease longer than the maximum specified, the lease is granted only for the maximum time configured on the server. After a lease expires, the client must request a new lease.

Note: Maximum lease times do not apply to dynamic BOOTP leases. These leases are not specified by the client and can exceed the maximum lease time configured.

The following example shows a configuration for maximum and default lease times:



[edit system services dhcp]
maximum-lease-time 7200;
default-lease-time 3600;

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