DHCP Leases on new ASA

[tolinrome tolinrome]

Hello,

Replacing a 3rd party firewall that currently provides dhcp services to all internal clients, with new asa firewall that will provide dhcp services. Do I need to break the leases on the current clients and then install the asa and the clients will then automatically receive new ip adresses form the asa? Or do I just replace the firewalls, then when the current leases expire they will get the new ones from the asa? Dont really want to do an ipconfig release renew on all the clients. Thanks.

[Philip D'Ath]

1. Install the new ASA.

2. Power cycle the switch(s) that everything plugs into.

3. When their links come up they will all do a DHCP renew.

[tolinrome tolinrome]

Thats interesting, I never knew that rebooting the switches would force a dhcp renew on the clients. What about the lease they're holding onto from the previous firewall?

[Philip D'Ath]

On "link up" the clients will send a DHCP renew.  The new ASA might accept it and let them continue using it (and register that address in its database).  If may also refuse to allow the device to continue using the IP address in which case the device will be forced to ask for a new IP address.

Depends a bit on weather the scopes are the same or not.