expired dhcp leases PA-3020 8.0.7

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L4 Transporter

expired dhcp leases PA-3020 8.0.7

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?

L7 Applicator

Re: expired dhcp leases PA-3020 8.0.7

@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. 

L4 Transporter

Re: expired dhcp leases PA-3020 8.0.7

@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?

L7 Applicator

Re: expired dhcp leases PA-3020 8.0.7

@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. 

L4 Transporter

Re: expired dhcp leases PA-3020 8.0.7

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

Highlighted
L7 Applicator

Re: expired dhcp leases PA-3020 8.0.7

@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. 

L4 Transporter

Re: expired dhcp leases PA-3020 8.0.7

Thank you, so I don't need to extend my network ;-)

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

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