topic Re: expired dhcp leases PA-3020 8.0.7 in General Topics

expired dhcp leases PA-3020 8.0.7

MPI-AE — Fri, 30 Nov 2018 10:22:47 GMT

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?

Re: expired dhcp leases PA-3020 8.0.7

BPry — Fri, 30 Nov 2018 18:40:27 GMT

@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.

Re: expired dhcp leases PA-3020 8.0.7

MPI-AE — Mon, 03 Dec 2018 10:26:54 GMT

@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?

Re: expired dhcp leases PA-3020 8.0.7

BPry — Tue, 04 Dec 2018 01:27:21 GMT

@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.

Re: expired dhcp leases PA-3020 8.0.7

MPI-AE — Tue, 04 Dec 2018 14:42:19 GMT

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

Re: expired dhcp leases PA-3020 8.0.7

BPry — Wed, 05 Dec 2018 04:15:08 GMT

@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.

Re: expired dhcp leases PA-3020 8.0.7

MPI-AE — Thu, 06 Dec 2018 14:29:13 GMT

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

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