Sunday, August 8, 2010

Making the Cisco IOS DHCP server useful

Yay for learning! Two of the features that I was under the impression were missing from an IOS based DHCP server are infact present:

1) The ability to ping clients prior to handing out an address:
Router(config)# ip dhcp ping packets 5
Specifies the number of ping packets the DHCP server sends to a pool address before assigning the address to a requesting client.

Router(config)# ip dhcp ping timeout 850
Specifies the amount of time the DHCP server waits for a ping reply from an address pool.

2) The ability to retain a DHCP leases table across reboots:
Router(config)#ip dhcp database flash:router-dhcp write-delay 60 timeout 10
Configure DHCP database location on a physical storage medium, this prevents the router from loosing all of it’s lease data after a reboot. By default, the router maintains the dhcp bindings in NVRAM.

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