D-Link DFL-800-AV-12 User Manual - Page 133
Using Prefetched Leases, 5. IP Pools
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5.5. IP Pools Chapter 5. DHCP Services Maximum clients greater than the prefetch parameter. The pool will start releasing (giving back IPs to the DHCP server) when the number of free clients exceeds this value. Optional setting used to specify the maximum number of clients (IPs) allowed in the pool. Using Prefetched Leases As mentioned in the previous section, the Prefetched Leases option specifies the size of the cache of leases which is maintained by NetDefendOS. This cache provides fast lease allocation and can improve overall system performance. It should be noted however that the entire prefetched number of leases is requested at system startup and if this number is too large then this can degrade initial performance. As leases in the prefetch cache are allocated, requests are made to DHCP servers so that the cache is always full. The administrator therefore has to make a judgement as to the optimal initial size of the prefetch cache. Example 5.5. Creating an IP Pool This example shows the creation of an IP Pool object that will use the DHCP server on IP address 28.10.14.1 with 10 prefetched leases. It's assumed that this IP address is already defined in the address book as an IP object called ippool_dhcp CLI gw-world:/> add IPPool ip_pool_1 DHCPServerType=ServerIP ServerIP=ippool_dhcp Web Interface 1. Go to Objects > IP Pools > Add > IP Pool 2. Now enter Name: ip_pool_1 3. Select Specify DHCP Server Address 4. Add ippool_dhcp to the Selected list 5. Select the Advanced tab 6. Set Prefetched Leases to 10 7. Click OK 133