We have got a captive portal set up for guest access which terminates on our Palo Alto firewalls. To meet our code of connection we need to capture DHCP lease offers but by default this does not seem possible.
DHCP lease ends are sent to the system log under the event lease-end, but to accurately ascertain when users connected to wireless we need to capture the full sequence of events ie. DHCP Offer, Portal Login and subsequent DHCP lease end and Portal session timeout.
The CLI command show dhcp lease all provides information on offered leases so one machanism which has been suggested is to script this to be pulled off the firewall, but this is not ideal.
Any further suggestions would be more than welcome!
Paul Woolnough - CCNP, CCDP
ICT Infrastructure Engineer - Networks
University Campus Suffolk
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