Thanks Nick. When I comment ipv4_integer in the module, I see ‘cast’ error. But lease is updated in the db. Debug : (21) redis_ippool - Updating 169.254.0.91 in pool "naw01_healthcheck_VSAT-UT", device "01:01:bc:11:22:33_01:01:bc:11:22:33_0x0101bc112233", expires in 900s Debug : (21) redis_ippool - Reserved connection (0) Debug : (21) redis_ippool - [1] >>> Sending command(s) to 10.43.16.101:6379 Debug : (21) redis_ippool - [1] <<< Returned: success Debug : (21) redis_ippool - Released connection (0) Debug : (21) redis_ippool - &reply.IP-Address-Lease-Time := 900 Debug : (21) redis_ippool - Requested IP address' "169.254.0.91" lease updated ERROR : (21) redis_ippool - ERROR: Implicit cast failed: Invalid cast from combo-ip to ipaddr. Unsupported Debug : (21) redis_ippool.renew (fail) Regards, Nagamani Chinnapaiyan