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SonicOS 5.8.1 Administrator Guide
Extension to IP Helper
In order to support leases from the DHCP relay subsystem of IP Helper, the following changes
have been made in the IP Helper panel, located at Network > IP Helper:
• As part of the DHCP relay logic, IP Helper learns leases exchanged between clients and
the DHCP server, then saves them into flash memory.
• These learned leases are synched to the idle firewall, as part of the IP Helper state sync
messages.
MAC and IP address bindings from the leases are transferred into the MAC-IP Anti-Spoof
cache.