SonicOS 7.1 System

Table of Contents

Configuring the DHCP Server Settings

To use the SonicWall firewall’s DHCP server

  1. Navigate to NETWORK | System > DHCP Server | DHCP Server Settings.

  2. Choose which IP version to use (IPv4 or IPv6):

    IPv4

    IPv4

    IPv6

    IPv6

  3. To distribute IP addresses, subnet masks, gateway addresses, and DNS server addresses to your network clients, select Enable DHCPv4/6 Server. This option is selected by default. For IPv4, Advanced and other server settings options become available.
  4. For configuring DHCPv6, skip to Step 7.

  5. To turn on automatic DHCP scope conflict detection on each zone when another DHCP server is present, select Enable Conflict Detection. This option is selected by default.

    Currently, DHCP server performs server-side conflict detection when this feature is enabled. The advantage of server-side conflict detection is that it detects conflicts even when the DHCP client does not run client-side conflict detection. However, if there are a lot of DHCP clients on the network, server-side conflict detection can result in longer wait times for a full IP address allocation to complete.

    Conflict detection is not performed for an IP address that belongs to a “relayed” subnet scope. The DHCP server only performs a conflict detection ICMP check for a subnet range attached to its interface.

  6. To allow the current state of the DHCP leases in the network to be periodically written to Flash, select Enable DHCP Server Persistence. At reboot, the system restores the previous DHCP server network DHCP allocation knowledge based on the IP. Lease times stored in Flash. This option is selected by default. When this option is selected, the DHCP Server Persistence Monitoring Interval option is available.

    • To control how often changes in the network are examined and, if necessary, written to Flash, enter the time, in minutes, in DHCP Server Persistence Monitoring Interval. The default is 5 minutes, the minimum is five minutes, and the maximum is 1440 minutes (24 hours).
  7. To configure Option Objects, Option Groups, and Trusted Agents, click Advanced. For detailed information on configuring these features, see Configuring Advanced Options.
  8. Click Accept.