expired dhcp leases PA-3020 8.0.7

[MPI-AE]

Hi all,

there is a dhcp server for a network with a lease time of 14 days. When I open the allocation, there are a lot of expired dhcp leases.

Doesn't the firewall automatically delete them?

[BPry]

@MPI-AE,

Nope. The firewall will re-assign the entry if it needs to, but if that host connects again before the entry is re-used for someone else they'll still be assigned that address. Until absolutely necissary to assign the address to something else, it will display as you're currently seeing. 

[MPI-AE]

@BPry

But what exactly does that mean?

currently, there are 96% used ip addresses.

Does the firewall reassign expired ip addresses to anonther host before 100% are used?

[BPry]

@MPI-AE,

Essentially expired on the firewall means it can be assigned to another client if required. If the firewall never encounters a need to re-assign these addresses to a different client the client will always pull the same exact IP address. 

[MPI-AE]

@BPryWhat would be a requirement for the firewall to reassign an expired ip address to another/new client?

[BPry · Accepted solution]

@MPI-AE,

So anytime the firewall runs out of addresses in a particular address pool, the server re-allocates the expired address to a different host. However to get this effect the address pool needs to be out of addresses. These 'expired' addresses will then be automatically released and assigned to the new clients. 

[MPI-AE]

Thank you, so I don't need to extend my network 😉

Would be really useless though, you would have to extend your network regulary..