Can DHCP server give out a lease time greater than requested by DHCP client?

I have a centOS DHCP server configured to give out a lease of 20 mins. But a client is requesting a lease for 10 mins. Is it possible to co开发者_如何学JAVAnfigure dhcpd to give out a lease of 20 mins even if client requests for a 10 mins lease.

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Yes it can. DHCPD server will provide the Lease based on dhcpd options

min-lease-time 120; <- Mean minimum lease DHCP server will assign greater than 120 secs
max-lease-time 120; <- Mean maximum lease DHCP server will assign less than 120 secs
default-lease-time 120; <- Mean default lease DHCP server will assign is 120 secs

you want all 3 options for all the networks ranges you will setting up otherwise what happens client may get weird leases.

You can check man pages on linux server you have dhcpd configured

man 5 dhcpd

or check https://linux.die.net/man/5/dhcpd.conf

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See dhcpd.conf(5):

   The min-lease-time statement

      min-lease-time time;

      Time should be the minimum length in seconds that will be assigned to a lease.