TP-Link T2600G-18TSTL-SG3216 T2600G-18TSUN V1 Configuration Guide - Page 571
Ping Time Config, Apply, Excluded IP Address, Create,
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Configuring DHCP DHCP Server Configuration DHCP Server Enable or disable DHCP Server. By default, it is disabled. Option 60 (Optional) Specify the option 60 for device identification. Mostly it is used under the scenario where the APs (Access Points) apply for different IP addresses from different servers according to the needs. If an AP requests option 60, the server will respond a packet containing the option 60 configured here. And then the AP will compare the received option 60 with its own. If they are the same, the AP will accept the IP address assigned by the server, otherwise the assigned IP address will not be accepted. Option 138 (Optional) Specify the option 138, which can be configured as the management IP address of an AC (Access Control) device. If the APs in the local network request this option, the server will respond a packet containing this option to inform the APs of the AC's IP address. 2) In the Ping Time Config section, configure Ping Packets and Ping Timeout for ping tests. Click Apply. Ping Packets Enter the number of ping packets the server can broadcast to test whether the IP address is occupied. The valid values are from 1 to 10, and the default is 1. When the switch is configured as a DHCP server to dynamically assign IP addresses to clients, the switch will deploy ping test to avoid IP address conflict resulted from assigning IP addresses repeatedly. Ping Timeout Specify the ping timeout period in milliseconds. It ranges from 100 to 10000 ms and the default is 100 ms. The DHCP server broadcasts an ICMP Echo Request (ping packet) to test whether an IP address is occupied or not. If there is no response within the ping timeout period, the server will broadcast the ping packet again. If the number of ping packets reaches the specified number and there is still no response, the server will assign the IP address. Otherwise, the server will record the IP address as a conflicted IP address and assign another IP address to the client. 3) In the Excluded IP Address section, enter the Start IP Address and End IP Address to specify the range of reserved IP addresses. Click Create. Start IP Address/ End IP Address Specify the start IP address and end IP address of the excluded IP address range. If the start IP address and the end IP address are the same, the server excludes only one IP address. When configuring DHCP Server, you need to reserve certain IP addresses for each subnet, such as default gateway address, broadcast address and DNS server address. Configuration Guide 541
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